Remoting Vs. DCOM

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  - 1
    - Client-Server & Standalone Using Same Code Base I have to write an app that can be offered as both a client-server solution as well as a standard solution. For the server-client solution here are multiple users all of them working with the same data. The solution might be deployed on an intranet or internet. The client has some complex functions so I need a "rich" client. For the standalone version the user want his personal data on his computer. He is the only one using the program and he is using it only from one computer. The user might connect to the server for a data feed, though. In both scenarios the users should be able to do some (limited) work even when they are not connected to the server. I do not want to write a seperate application for both scenarios. So I was thinking of simply putting the client and server on the same user machine. There are a few problems with that, though. 1) The user does not have MSSQL. I might just use MSDE for the standalone version. 2) The user does not have IIS. This is a problem because I wanted to use web services on the server to supply the client with data. 3) There might be some problems with authentification, authorization, etc. Any inputs on this is highly appreciated. Regards, Rob Tag: Remoting Vs. DCOM Tag: 101399
  - 2
    - System.Web.Mail Hello, friends, I installed .net Enterprise Architect version 2003 (Fraimework 1.1, version 1.1.4322) in my machine, and tried to run sample C# source code that has statement: using System.Web.Mail However, when I compiled it, I got erros, saying "Mail" does not exist in the class or namespace "System.Web". I checked the MSDN Library coming together with .net, it says "Systme.Web" does contain namespace "Mail" To eliminate the possibility that I did not install in my first installation, I then installed all missing components, but the error is still there. What is wrong here? Help please.... Thanks a lot. Tag: Remoting Vs. DCOM Tag: 101390
  - 3
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XP Hacks ASP.NET in a Nutshell, Second Edition Amazon Hacks: 100 Industrial-Strength Tips and Tools Learning PHP 5 CSS Cookbook Dreamweaver MX 2004: The Missing Manual Mastering Oracle SQL, 2nd Edition Access Cookbook, 2nd Edition Oracle SQL*Plus : The Definitive Guide (Definitive Guides) HTTP Developer's Handbook Cryptography for Dummies Google for Dummies The Dreamweaver Developer's Instant Troubleshooter Windows XP Pro: The Missing Manual How to Do Everything with Adobe Illustrator CS JavaScript: The Complete Reference, Second Edition Advanced PHP for Web Professionals Core PHP Programming, Third Edition Programming Oracle Triggers and Stored Procedures (3rd Edition) Web Caching (O'Reilly Internet Series) Microsoft WSH and VBScript Programming for the Absolute Beginner Macromedia Flash MX 2004 Fast & Easy Web Development Essential ASP.NET With Examples in C# A Programmer's Guide to .NET JavaScript: The Definitive Guide Apache: The Definitive Guide (3rd Edition) Programming ColdFusion MX, 2nd Edition Java Extreme Programming Cookbook Mac OS X for Java Geeks Learning XML, Second Edition JavaScript & DHTML Cookbook ActionScript Cookbook Java Database Best Practices Office 2003 XML Web Database Applications with PHP & MySQL, 2nd Edition AI for Game Developers AppleScript : The Definitive Guide (Definitive Guides) Oracle Essentials, 3e: Oracle Database 10g Java Examples in a Nutshell, 3rd Edition Essential ActionScript 2.0 Java Network Programming, Third Edition PHP Developer's Cookbook (2nd Edition) Sams Teach Yourself DB2 Universal Database in 21 Days, Second Edition Inside Microsoft SQL Server 2000 (With CD-ROM) XML Programming (Core Reference) Developing International Software, Second Edition Winning the Knowledge Game : Smarter Learning for Business Excellence Programming PHP JavaScript Professional Projects 070-015 070-016 070-019 070-028 070-029 070-080 070-081 070-086 070-088 070-098 070-100 070-152 070-175 070-176 070-210 070-214 070-215 070-216 070-217 070-218 070-220 070-221 070-222 070-223 070-224 070-226 070-227 070-228 070-229 070-300 070-305 070-306 070-310 070-315 070-316 070-320 Tag: Remoting Vs. DCOM Tag: 101380
  - 4
    - Problem with Sockets Hi, I'm developing a program who needs that user communicate via TCP over the net. One will be the listener and the other one the client, as usual. I've implemented the code as two classes deriving from a common interface. Everything seems to work OK until I use the Close() method. I've tried both using EndReceive(result) or commenting it. If I use it, the connection is not closed. If not, both applications close themselves: the one on the end-point with a error (not an exception, but an Windows fatal error). The code is below. Thanks in advance. If someone could help me, I'd be very pleased. using System; using System.Net; using System.Net.Sockets; using System.Text; namespace ThreatOfChaos.Connection { // This two classes are used in callbacks class MessageEventArgs : System.EventArgs { string message; public MessageEventArgs(string Message) { this.message = Message; } public string Message { get { return message; } } } class ConnectionEventArgs : System.EventArgs { Socket socket; public ConnectionEventArgs(Socket Socket) { this.socket = Socket; } public Socket Socket { get { return socket; } } } public delegate void MessageReceivedHandler(object sender, MessageEventArgs e); public delegate void ConnectionEstablishedHandler(object sender, ConnectionEventArgs e); public delegate void ConnectionClosedHandler(object sender); // This is the interface that both // client and server implement. public interface IConnection { event MessageReceivedHandler MessageReceived; event ConnectionEstablishedHandler ConnectionEstablished; event ConnectionClosedHandler ConnectionClosed; Socket Socket { get; } void Start(int Port, IPAddress address); void Send(byte[] buffer); void Send(string data); void Close(); } public class SocketPacket { public Socket Socket; public byte[] DataBuffer = new byte[1000000]; } // This is the Client implementation public class ClientConnection : IConnection { public event MessageReceivedHandler MessageReceived; public event ConnectionEstablishedHandler ConnectionEstablished; public event ConnectionClosedHandler ConnectionClosed; Socket client; AsyncCallback dataReceived; IAsyncResult result; public Socket Socket { get { return client; } } public void Start(int Port, IPAddress address) { client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint endPoint = new IPEndPoint(address, Port); client.Connect(endPoint); if (client.Connected) { if (ConnectionEstablished != null) { ConnectionEventArgs e = new ConnectionEventArgs(client); ConnectionEstablished(this, e); } WaitForData(); } else { throw new Exception("Client not connected"); } } public void WaitForData() { if (client.Connected) { if (dataReceived == null) dataReceived = new AsyncCallback(OnDataReceived); SocketPacket packet = new SocketPacket(); packet.Socket = client; result = client.BeginReceive(packet.DataBuffer, 0, packet.DataBuffer.Length, SocketFlags.None, dataReceived, packet); } else { Close(); } } public void OnDataReceived(IAsyncResult asyn) { SocketPacket packet = (SocketPacket)asyn.AsyncState; int iRx = packet.Socket.EndReceive(asyn); char[] chars = new char[iRx + 1]; Decoder d = Encoding.Unicode.GetDecoder(); int charLen = d.GetChars(packet.DataBuffer, 0, iRx, chars, 0); string data = new string(chars); if (MessageReceived != null) { MessageEventArgs e = new MessageEventArgs(data); MessageReceived(this, e); } WaitForData(); } public void Send(byte[] buffer) { if (client.Connected) { client.Send(buffer); } else { Close(); } } public void Send(string data) { byte[] byData = Encoding.Unicode.GetBytes(data); Send(byData); } public void Close() { client.EndReceive(result); client.Close(); Send(""); if (ConnectionClosed != null) ConnectionClosed(this); } } // This is the Server implementation public class ServerConnection : IConnection { public event MessageReceivedHandler MessageReceived; public event ConnectionEstablishedHandler ConnectionEstablished; public event ConnectionClosedHandler ConnectionClosed; Socket listener; Socket workerSocket; AsyncCallback dataReceived; IAsyncResult result; public void Start(int Port, IPAddress address) { listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint ipLocal = new IPEndPoint(IPAddress.Any, Port); listener.Bind(ipLocal); listener.Listen(4); listener.BeginAccept(new AsyncCallback(OnClientConnect), null); } public void OnClientConnect(IAsyncResult asyn) { workerSocket = listener.EndAccept(asyn); if (ConnectionEstablished != null) { ConnectionEventArgs e = new ConnectionEventArgs(workerSocket); ConnectionEstablished(this, e); } WaitForData(workerSocket); } public void WaitForData(Socket socket) { if (socket.Connected) { if (dataReceived == null) dataReceived = new AsyncCallback(OnDataReceived); SocketPacket packet = new SocketPacket(); packet.Socket = socket; result = socket.BeginReceive(packet.DataBuffer, 0, packet.DataBuffer.Length, SocketFlags.None, dataReceived, packet); } else { Close(); } } public void OnDataReceived(IAsyncResult asyn) { SocketPacket packet = (SocketPacket)asyn.AsyncState; int iRx = packet.Socket.EndReceive(asyn); char[] chars = new char[iRx + 1]; Decoder d = Encoding.Unicode.GetDecoder(); int charLen = d.GetChars(packet.DataBuffer, 0, iRx, chars, 0); string data = new string(chars); if (MessageReceived != null) { MessageEventArgs e = new MessageEventArgs(data); MessageReceived(this, e); } WaitForData(packet.Socket); } public Socket Socket { get { return (Socket)listener; } } public void Send(byte[] buffer) { if (workerSocket.Connected) { workerSocket.Send(buffer); } else { Close(); } } public void Send(string data) { byte[] byData = Encoding.Unicode.GetBytes(data); Send(byData); } public void Close() { workerSocket.EndReceive(result); workerSocket.Close(); listener.Close(); if (ConnectionClosed != null) ConnectionClosed(this); } } } Tag: Remoting Vs. DCOM Tag: 101379
  - 5
    - Looking for a better licensing technology We have a .NET class library with a built-in license-control system that checks for the presence of a digitally signed license file AT RUNTIME. This is a fairly standard technique that distinguishes between "trial" licenses (which only allows only limited functionality) and "full" licenses. We have not, however, figured out an effective way to apply licensing techniques AT DESIGN TIME. I have evaluated a few different licensing technologies and products and I have not figured out a way to achieve any control, record or react to what kind of license is present when code that is referencing our class licrary is bein compiled. I have explored the facilities for licensing in System.ComponentModel and (as far as I can tell) that only impacts what happens when a "component" is being visually manipulated by designer tools such as a Visual Studio forms designer. It does not seem to prevent anyone from compiling code that simply instantiates my classes and calls my methods, not does it record any licensing information when such code is being compiled. At a high level, what I want to achieve is that developers can use a trial license of my class library to compile and execute their own test programs, but they should not be able to "go live" until developers have obtained a "full" license, recompiled the app, and deployed to a machine that has a "full" license. Tag: Remoting Vs. DCOM Tag: 101377
  - 6
    - How to draw a focus rect? Using: ms framework 1.1 How to mark a selected region in a picturebox control? Thanks IA JH Tag: Remoting Vs. DCOM Tag: 101373
  - 7
    - regex syntax I am new to using both dotnet and regex. I have done the basic reading to the point I thought I know how to use regex to extract date string. But I ran into problems. what is the best regex expression to look for month names or date string for that matter? from my testing, I could use "((JAN)|(FEB)|(MAR)|(APR)|(MAY)|(JUN)|(JUL)|(AUG)|(SEP)|(OCT)|(NOV)|(DEC))" not '([ADFJMNOS][ACEOPU][BCGLNPRTVY])" In other word I got syntax problem with the month pattern I am working towards dealing with various date format I deal with My object is to get the entire date string and parse into yyyy-mm-dd or whatever the dotnet conversion routine will take. I will have to deal with many long strings of 64K to 200K . This is the reason I am locking for a good regex expression to minimize delays from processing I know I have to deal with yyyy-mm-dd ( and variants thereof with dot or slash as separator instead of dash, single digit month or day) yyyy-MMM-dd ( or just space instead of -) MMM d, yy ( or yyyy) and the tougher ones like d MMM yyyy d MMM yy Tag: Remoting Vs. DCOM Tag: 101371
  - 8
    - finally is not always being executed... Hi, I was under the impression that the finally block always got executed no matter what. Well I ran into a situtation that I can duplicate from a console app as well as a web application. For the console app if the try block is executing/processing its clode and the console app is closed the finally block is not called. The same is true for the web app. If the page_load or button_click is processing cose and it is wrapped by a try/catch/finally or try/finally the finally is not called if the web page is closed. Give it a try, I was blown away by this. I thought no mwatter what the finally block was called and I have very important logic that needs to be called. Below is very sloppy code, but it will do the trick to show this isn't working. The same goes for the console. Just put the try/finally in the main. Code: using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.IO; public partial class GeneralTest : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Response.Write(DateTime.Now.ToString()); } protected void Button1_Click(object sender, EventArgs e) { try { System.Text.StringBuilder sb = new System.Text.StringBuilder(); for (int x = 0; x < 100000000; x++) { for (int y = 0; y < 100000000; y++) { sb.Append(x.ToString() + " " + y.ToString()); } } } finally { FileStream fsUpdateBackupDateTime = new FileStream(@"c:\zzzzcjm.txt", FileMode.OpenOrCreate); StreamWriter sw = new StreamWriter(fsUpdateBackupDateTime); sw.Write(DateTime.Now.ToString()); sw.Flush(); sw.Close(); } } } I guess is there anything that can be done or a way to make the finally or a block of code to be called if the console app or web application is closed? Thanks for your time!! cmullins Tag: Remoting Vs. DCOM Tag: 101366
  - 9
    - VS2005: where to put resources I was wondering what is the difference between - putting resources in Formxxx.resx (form level) ? (my prefered) and - putting resources in Resources.resx (app level) ? Thanks Nicolas Guinet Tag: Remoting Vs. DCOM Tag: 101359
  - 10
    - Large images in comparison with VB6 Hi all, Our software need to work with large bitmaps (approx. 3 to 6 megabytes). Our previous versions were all build with VB6 and used the PictureBox control to load, zoom and pan the bitmap. It all works without a problem, and it is pretty fast. We are rebuilding our software in .Net and experiencing performance problems when it comes to loading, displaying, panning and zooming this large bitmaps. In other words: it is unacceptable slow. How come that the same techniques works flawless in a prehistoric [ :-) ] programminglanguage/environment and seem to fail completly in a modern one like .Net? I've already tried different approaches (like drawing directly on a graphics surface etc.), but zooming and panning of a large images is realy slow. Another thing is that those images consume lots more memory in .Net than it did in VB6.... Am i missing something here? Should i use DirectX? I've googled my *ss of, but i can't find 'the' solution..... Hints, tips, URL..... anything is helpfull... Greets, Erik. Tag: Remoting Vs. DCOM Tag: 101351
  - 11
    - Programmatically Refreshing the Page One thing that I have often needed to do that I have been unable to find a way to do is refresh the page (basically do the same thing as pressing the browser's Refresh button). I know how to do this using Javascript/JScript, but I have situations in which I need it to be done immediately after code that is part of my other code. Is there any way to do this? Thanks. -- Nathan Sokalski njsokalski@hotmail.com http://www.nathansokalski.com/ Tag: Remoting Vs. DCOM Tag: 101340
  - 12
    - client certificates and private keys. Hi, I will be writting a web application that will accept certificates from clients. What I really need is to get the private key from the client and decrypt some data and display it. Clients that do not have the private key will not encrypted data. Is this possible? Can someone point me to the right direction. Regards, DS Tag: Remoting Vs. DCOM Tag: 101338
  - 13
    - .NET Framework 2.0 Beta 2 installation errors I'm trying to install .NET Fw 2.0 as a prereq to Visual Web Developer 2005, and I just can't get it to go, I keep getting this message in the FailInfo.txt log, and I can't find any online answers: Error 25015.Failed to install assembly 'C:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\System.configuration.dll' because of system error: 0x80131107 Any suggestions? Tag: Remoting Vs. DCOM Tag: 101330
  - 14
    - Debugging startsup slow I am debugging managed and unmanaged code in C++ DLL When ever i start debugging debugger hangs for 30secs or so at the last line below at the last line and then continues as normal. How can i overcome this problem? 'Tester.exe': Loaded 'C:\WINDOWS\system32\comctl32.dll', No symbols loaded. 'Tester.exe': Loaded 'C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\mscorlib.dll', No symbols loaded. 'Tester.exe': Loaded 'C:\WINDOWS\assembly\NativeImages1_v1.1.4322\mscorlib\1.0.5000.0__b77a5c561934e089_9beb14e4\mscorlib.dll', No symbols loaded. thanks!!! Tag: Remoting Vs. DCOM Tag: 101329
  - 15
    - Misbehaving COM object? We have a .NET project that makes pretty regular use of a COM object that appears to be misbehaving. Am I correct in understanding that setting a COM object to nothing should act the same way that it would have in VB6? By this I mean it is actually destroyed and not marked for GC. We have an object that is called in a polling routine and looks to be leaking 6-8K at a time and never being reclaimed even though it is set to nothing. Is this possible in .NET or do we just have a poorly written COM object? TIA Tag: Remoting Vs. DCOM Tag: 101327
  - 16
    - Namespace organization Any advice on how to organize my core class library project into sub-namespaces? What are the general rules of thumb regarding cross-namespace references? Can I have a class in namespace A have a function or a property that returns a class from a different namespace? For example, lets say I have a root namespace called ACME for my class library project. Under the root namespace are classes such as Individual, Address, etc. I also have a namespace defined for financial classes, called ACME.Financial, which contains classes such as Invoice and Transaction. Under Financial is a subnamespace called Discounts (ACME.Financial.Discounts). A second namespace under the root, called ACME.Groups, contains classes such as Group, GroupPlan, etc. ACME ACME.Financial ACME.Financial.Discounts ACME.Groups Now, if I'm coding something for the GroupPlan class in ACME.Groups, is it ok (I know it's possible but is it acceptable) to return an object of type ACME.Financial.Invoice from the ACME.Groups.GroupPlan class or should I stick to classes contained within the local namespace boundary (ACME.Groups) or higher (ACME)? Any thoughts or articles discussing Namespace coding best practices (all I could find were ones about naming standards - not enough detail regarding class layout) would be appreciated. - Dave Tag: Remoting Vs. DCOM Tag: 101324
  - 17
    - WebRequest https and proxy authentication Hi I am using WebRequest object to access a https URL through a proxy: string Url = "https://www.verisign.com"; WebProxy proxy = new WebProxy("http://proxyserver.domain.com:80",true); proxy.Credentials=System.Net.CredentialCache.DefaultCredentials; WebRequest req =WebRequest.Create(Url); req.Method="GET"; req.Proxy= proxy; result = req.GetResponse(); The proxy server requires NTLM authentication. This code works fine if (a) The URL is an http site (b) the URL is a local https site (therefore bypassing the proxy) but doesnt work where proxy authentication is required for an external https URL. I can access the https site fine through the proxy in IE so the proxy and authentication are clearly working OK. I have read another post that indicated this was an issue in .NET Compact Framework (http://www.dotnet247.com/247reference/msgs/51/255270.aspx) - does anybody know if this is also the case with .NET on W2003? Or is there something that I am missing? Any help gratefully received. Tag: Remoting Vs. DCOM Tag: 101323
  - 18
    - Socket data out of order I am using asynchronous socket receives and writing the data to a disk file. I am finding all of the data makes it to the file, but it is SLIGHTLY out of order. The approach is to create a pool of contexts, each which has a 1K byte buffer. Then I start it all by getting a buffer from the pool, and do a BeginReceive on the socket. In the receive completion handler I call EndReceive. THEN get a buffer from the free pool, and I invoke BeginReceive again. If my buffer pool was exhausted I would allocate a new one, rather than stall. THEN I invoke BeginWrite to write the just-received data to the disk file. In the write completion handler I return the context and buffer to my buffer pool. I am managing my buffer pool in a .NET "Queue". I protect all Enqueue and Dequeue with Synclock on the Queue object. Enqueues and Dequeues seem to have integrity, in that there are the correct number of buffer pools in the queue when the whole thing winds down. Without the disk writing I get about 60 MBits / second maximum received on the socket. When I involve the disk writing it hunkers down to about 22 MBits / second. My pool size is initially 25 contexts/buffers, but typically grows to about 80-90 with very large and very fast transmissions. I don't queue up multiple simultaneous socket receives. I know that doing that could easily result in EndReceives firing out of order with the data stream. But obviously I am queueing up to about 80-90 pending disk writes. But they SHOULD be queued up in the order they were received. And I understand they should then end up in the disk file in the correct order. I suspect something about this aspect of writing to the disk is what is getting the data out of order. Can you see what I am doing wrong? Or perhaps there are some known bugs in the Framework? Maybe I need a SyncLock that entirely covers the segment of code starting with the EndReceive and ending with the BeginWrite? Tag: Remoting Vs. DCOM Tag: 101318
  - 19
    - Date format question Hello, I would like to define a date format that displays a datetime according to the current culture like this : if locale is 'fr' then date format would be "dd/MM HH:mm" if locale is 'en' then date format would be "MM/dd HH:mm" and so on.... But I do not want to manage each locale separately to be sure that month/day ordering is correct ! How can I do this ? TIA. Tag: Remoting Vs. DCOM Tag: 101317
  - 20
    - Multicast Sockets: no sending with active local Internet Connection I have a Multicast Sockets Chat / Picture Program that runs correctly when there is no Internet Connection on the local Machine. 2 Chat Programs run correctly on the same Maschine (when different Ports are used). 1 Chat Programm on each Maschine also works correctly. 3 Chat Programs run correctly on the both Maschines (when different Ports are used on the second Machine). But when the local Internet is started on the first Machine the Chat program on that Machine cannot recieve or send. The second Chat on the second Machine recieve however the Message from the first Chat on that Machine. What could be the cause of this be? The ports for the Fireball are OK (when newly compiled, it allways asks). The Group used is : 234.77.77.0 - could it be something with the '234' ? I have recieved Mails with similar reports. On another LAN (also without Internet) everything is OK. I have been told that on a LAN where the Internet Connection is on some other Machine it also works. So it looks like problem with the Local Connection - but I can see nothing in the Properties that could be set. Mark Johnson, Berlin Germany mj10777@mj10777.de Tag: Remoting Vs. DCOM Tag: 101304
  - 21
    - Icon in the tray for a service app Hello. I'm creating a windows service and would like to add a tray icon for it. Can this be done from a windows service app, or do I need to create a controller app? Thanks in advance, Mike Tag: Remoting Vs. DCOM Tag: 101300
  - 22
    - ADO.NET and SQL Server Data Paging I had to built a custom data paging control for my asp.net app and SQL Server. This is what I'm doing: 1. do a SELECT to a SqlDataReader 2. create a DataTable with data from GetSchema() 3. loop trough the datareader using .Read() to the point I want to start 4. add data to DataTable with max of [pageSize] records 5. close the data reader and return The question is: Isn't looping reader.Read() doing nothing to go to start point where I want start getting data too expensive? Although DataReader is fast, won't ".Read()" get the row data from the server to the client? If so, if I need to get data from record 10000 ahead, it is actually reading all 10 thousand rows of data, so it is a big waste of resources. Maybe someone who knows more about the internals of the DataReader can answer this. Since SQL Server doesn't support "LIMIT" like keywords, if there is a better way to page data in sql server, I would like to know. Thanks. Tag: Remoting Vs. DCOM Tag: 101297
  - 23
    - Implementing / using the IExpando interface Guys, Does anyone know much about the IExpando interface? I have a business object I've created and I'd like to add support for methods / attributes at runtime so that scripting clients ( e.g. ASP / VBScript / Java script ) can call the .NET object through a RCW and invoke methods which are added at runtime. Do I need to inherit my .NET class from IExpando and implement methods such as AddMethod. Are these called by the scripting engine to resolve methods which don't exist. e.g. assume a query class contains methods such as Save however a method Resolve needs to be added at runtime so I can write code such as oQuery.Resolve. Cheers Matt Tag: Remoting Vs. DCOM Tag: 101290
  - 24
    - SQL + Dreamweaver Hello, I seem to be running into a problem with regards to data size etc: Explanation: A person opens a .aspx page and posts and writes an article of a few thousand words. When they click Insert Record they get this message: System.Data.SqlClient.SqlException: String or binary data would be truncated. The statement has been terminated. at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at DreamweaverCtrls.DataSet.DoInit() Problem: It's to do with the size of the data being inserted into the record and I have increased the VarChar length to 6000 characters to compensate. Is there a better DataType to hold the information? With MS Access this is a major problem but I would expect that but not with SQL Server? Any suggestions? Tag: Remoting Vs. DCOM Tag: 101288
  - 25
    - Determining the path to the .NET framework Is there a canonical way to determine the path to the folder where the runtime environment is installed? The reason I am asking is that I have created a small Office Add-In in C# which needs to be registered as a COM component using regasm.exe during installation. So I need a way for the install script (the Add-In is only a part of a larger project which does not use the default Microsoft installer) to find the regasm, since it is not in the path by default. Tag: Remoting Vs. DCOM Tag: 101284
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  - 1
    - Drag and Drop Question I've been looking around for info on this, but not finding much. What I'm trying to do is allow a user to drag and drop objects between two forms in my app. The objects are classes that I've built and I want the target form to be able to recognize what kind of type is being dragged over it and dropped. From what I could tell from the MSDN docs, I apparently need to add a custom dataformat type to the existing list, and/or to register a new data type in the registry. Can anyone explain exactly how I need to do this, or point me to a tutorial somewhere? I'm pretty stuck on this one. Thanks! Tag: Remoting Vs. DCOM Tag: 101280
  - 2
    - Collection - DataStructure. hi, We have 1 lakh records with row size 3kb These records are palced by a service and another service will pickup these records and process. Because of this a huge burgen is there on the server and it has to do very fast hence, we decided to put this in ram itself. Can anyone suggest the best datastructure to this ASAP. Thanks in Advance, Prasad Dannani Tag: Remoting Vs. DCOM Tag: 101279
  - 3
    - How to position message box? How to position message box programatically using C# .NET? Thanks. Tag: Remoting Vs. DCOM Tag: 101268
  - 4
    - input string not in correct format I am gettign this error, while migration an app to asp.net Exception Details: System.FormatException: Input string was not in a correct format. Source Error: Line 19: Dim enddate = request.QueryString("enddate") Line 20: Line 21: if cint(eventid) = "0" then Line 22: searchtype = 0 Line 23: else Source File: C:\Documents and Settings\amit\WebSite1\reports\loc_summary_calc.aspx Line: 21 Stack Trace: [FormatException: Input string was not in a correct format.] Microsoft.VisualBasic.CompilerServices.Conversions.ParseDouble(String Value, NumberFormatInfo NumberFormat) +216 Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value) +91[InvalidCastException: Conversion from string "ns" to type 'Integer' is not valid.] Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value) +247 Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(Object Value) +988 ASP.loc_summary_calc_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in C:\Documents and Settings\amit\WebSite1\reports\loc_summary_calc.aspx:21 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +98 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20 System.Web.UI.Page.Render(HtmlTextWriter writer) +27 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +53 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +278 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +24The code isdim eventid, subeventid, cyear, searchalleventeventid = request.QueryString("VIOSel1")subeventid = request.QueryString("subvioSel1")cyear = request.QueryString("cyear")searchallevent = request.QueryString("searchall")Dim startdate = request.QueryString("startdate")Dim enddate = request.QueryString("enddate") System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +8937 The code is as follows, <% dim searchtype '0 - search all zone '1 - search by zone '2 - search by location dim eventid, subeventid, cyear, searchallevent eventid = request.QueryString("VIOSel1") subeventid = request.QueryString("subvioSel1") cyear = request.QueryString("cyear") searchallevent = request.QueryString("searchall") Dim startdate = request.QueryString("startdate") Dim enddate = request.QueryString("enddate") if cint(eventid).ToString() = 0 then searchtype = 0 else if cint(subeventid) = 0 then searchtype = 1 else searchtype = 2 end if end if Dim Command1__startdate Command1__startdate = startdate Dim Command1__enddate Command1__enddate = enddate %> Tag: Remoting Vs. DCOM Tag: 101267
  - 5
    - syntax error in update statement in vb.net HI i am getting the foll error while conv an asp application to asp.net Exception Details: System.Runtime.InteropServices.COMException: Syntax error in UPDATE statement. Source Error: Line 112: MM_editCmd.ActiveConnection = MM_editConnection Line 113: MM_editCmd.CommandText = MM_editQuery Line 114: MM_editCmd.Execute Line 115: MM_editCmd.ActiveConnection.Close Line 116: Source File: C:\Documents and Settings\amit\WebSite1\edit_location.aspx Line: 114 Stack Trace: [COMException (0x80040e14): Syntax error in UPDATE statement.] Microsoft.VisualBasic.CompilerServices.LateBinding.InternalLateCall(Object o, Type objType, String name, Object[] args, String[] paramnames, Boolean[] CopyBack, Boolean IgnoreReturn) +776 Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateCall(Object Instance, Type Type, String MemberName, Object[] Arguments, String[] ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack, Boolean IgnoreReturn) +193987 ASP.edit_location_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in C:\Documents and Settings\amit\WebSite1\edit_location.aspx:114 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +98 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20 System.Web.UI.Page.Render(HtmlTextWriter writer) +27 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +53 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +280 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +24 The code whre the statement was declared is as follows, <% ' *** Update Record: construct a sql update statement and execute it If (Trim(Request("MM_update")) <> "" And Trim(Request("MM_recordId")) <> "") Then ' create the sql update statement MM_editQuery = "update " & MM_editTable & " set " For MM_i = LBound(MM_fields) To UBound(MM_fields) Step 2 MM_formVal = MM_fields(MM_i+1) MM_typeArray = Split(MM_columns(MM_i+1),",") MM_delim = MM_typeArray(0) If (MM_delim = "none") Then MM_delim = "" MM_altVal = MM_typeArray(1) If (MM_altVal = "none") Then MM_altVal = "" MM_emptyVal = MM_typeArray(2) If (MM_emptyVal = "none") Then MM_emptyVal = "" If (MM_formVal = "") Then MM_formVal = MM_emptyVal Else If (MM_altVal <> "") Then MM_formVal = MM_altVal ElseIf (MM_delim = "'") Then ' escape quotes MM_formVal = "'" & Replace(MM_formVal,"'","''") & "'" Else MM_formVal = MM_delim + MM_formVal + MM_delim End If End If If (MM_i <> LBound(MM_fields)) Then MM_editQuery = MM_editQuery & "," End If MM_editQuery = MM_editQuery & MM_columns(MM_i) & " = " & MM_formVal Next MM_editQuery = MM_editQuery & " where " & MM_editColumn & " = " & MM_recordId If (Not MM_abortEdit) Then ' execute the update MM_editCmd = Server.CreateObject("ADODB.Command") MM_editCmd.ActiveConnection = MM_editConnection MM_editCmd.CommandText = MM_editQuery MM_editCmd.Execute MM_editCmd.ActiveConnection.Close If (MM_editRedirectUrl <> "") Then Response.Redirect(MM_editRedirectUrl) End If End If End If %> Tag: Remoting Vs. DCOM Tag: 101266
  - 6
    - syntax error in query expression in vb.net I am geting the following error while conv an asp to asp.net Exception Details: System.Runtime.InteropServices.COMException: Syntax error in query expression 'id =System.__ComObject'. Source Error: Line 196: for i = 0 to ubound(emaillist) Line 197: selectsqlstatement = "select * from tblusers where id =" & emaillist(i) Line 198: rs_email = conn.execute(selectsqlstatement) Line 199: tolist = tolist & rs_email("email") & ";" Line 200: Source File: C:\Documents and Settings\amit\WebSite1\email_form.aspx Line: 198 Stack Trace: [COMException (0x80040e14): Syntax error in query expression 'id =System.__ComObject'.] Microsoft.VisualBasic.CompilerServices.LateBinding.LateGet(Object o, Type objType, String name, Object[] args, String[] paramnames, Boolean[] CopyBack) +965 Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateGet(Object Instance, Type Type, String MemberName, Object[] Arguments, String[] ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack) +193727 ASP.email_form_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in C:\Documents and Settings\amit\WebSite1\email_form.aspx:198 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +98 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20 System.Web.UI.Page.Render(HtmlTextWriter writer) +27 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +53 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +280 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +24 The code for teh foll is, <% Dim counter,rs_email, tolist Dim emaillist as string() dim i as integer emaillist = split(request.Form("c"), ",") counter = 1 dim selectSqlStatement as string for i = 0 to ubound(emaillist) selectsqlstatement = "select * from tblusers where id =" & emaillist(i) rs_email = conn.execute(selectsqlstatement) tolist = tolist & rs_email("email") & ";" response.Write(rs_email("email")&";") if counter = 3 then response.Write("<br>") counter = 1 end if counter = counter + 1 next %> Tag: Remoting Vs. DCOM Tag: 101265
  - 7
    - type mismatch error I am getting teh following error while converting an asp application to asp.net, Exception Details: System.Runtime.InteropServices.COMException: Type mismatch. Source Error: Line 347: 'response.Write(sql2) Line 348: rs_getAlarmCount = Server.CreateObject("ADODB.Recordset") Line 349: rs_getAlarmCount.ActiveConnection = MM_rs_PAVE_CC_1_STRING Line 350: rs_getAlarmCount.Source = sql Line 351: rs_getAlarmCount.CursorType = 0 Source File: C:\Documents and Settings\amit\WebSite1\reports\campusfiresafetyreport.aspx Line: 349 Stack Trace: [COMException (0x80020005): Type mismatch.] Microsoft.VisualBasic.CompilerServices.LateBinding.InternalLateSet(Object o, Type& objType, String name, Object[] args, String[] paramnames, Boolean OptimisticSet, CallType UseCallType) +2138 Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateSet(Object Instance, Type Type, String MemberName, Object[] Arguments, String[] ArgumentNames, Type[] TypeArguments, Boolean OptimisticSet, Boolean RValueBase, CallType CallType) +180 Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateSet(Object Instance, Type Type, String MemberName, Object[] Arguments, String[] ArgumentNames, Type[] TypeArguments) +33 ASP.campusfiresafetyreport_aspx.getAlarmCount(Object location, Object alarmtype, Object thisyear) in C:\Documents and Settings\amit\WebSite1\reports\campusfiresafetyreport.aspx:349 ASP.campusfiresafetyreport_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in C:\Documents and Settings\amit\WebSite1\reports\campusfiresafetyreport.aspx:249 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +98 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20 System.Web.UI.Page.Render(HtmlTextWriter writer) +27 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +53 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +280 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +24 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +8878 The code is as follows, where the error occurs, <Script type="VB" runat="Server"> function getAlarmCount(location, alarmtype, thisyear) Dim sql = " SELECT COUNT(*) AS realalarmcount " & _ "FROM (tblEvent INNER JOIN tblEvent_type ON tblEvent.case_no = tblEvent_type.case_no) " & _ "WHERE (tblEvent_type.event_type_id = "& alarmtype &") " & _ " AND (tblEvent.date_of_event > '1/1/"& thisyear &"' and tblEvent.date_of_event < '12/31/"& thisyear &"' ) " if location <> "0" then sql = sql & " AND (tblEvent.location = "& location &") " end if 'response.Write(sql2) rs_getAlarmCount = Server.CreateObject("ADODB.Recordset") rs_getAlarmCount.ActiveConnection = MM_rs_PAVE_CC_1_STRING rs_getAlarmCount.Source = sql rs_getAlarmCount.CursorType = 0 rs_getAlarmCount.CursorLocation = 2 rs_getAlarmCount.LockType = 1 rs_getAlarmCount.Open() alarmcount = rs_getAlarmCount("realalarmcount") 'response.Write(alarmcount) rs_getAlarmCount.Close() rs_getAlarmCount = Nothing getAlarmCount = alarmcount end function </Script> Tag: Remoting Vs. DCOM Tag: 101264
  - 8
    - Monitor.Wait, with timeout This is a multi-part message in MIME format. --------------974C23208E5F277BA99B9297 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit The (beta 2) dox say "The time-out ... moves the thread to the ready queue, bypassing other threads ahead of it in the wait queue, so that it can reacquire the lock sooner." To me, this directly states that when I Pulse a locked object that has threads waiting, a thread that is waiting with a timeout will be moved to the ready queue ahead of a thread that is waiting without a timeout. It also rather strongly implies that a thread that is about to timeout will get priority ahead of a thread that is willing to wait longer. Yet, the attached program wakes waiting threads in creation order, exactly as if a Pulse or PulseAll simply moved threads from the waiting queue to the ready queue in the order that they entered the waiting queue. (Run the console app from a DOS box ...) Are the dox wrong, or am I misinterpreting my test program? -- www.midnightbeach.com --------------974C23208E5F277BA99B9297 Content-Type: text/plain; charset=us-ascii; name="Program.cs" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="Program.cs" using System; using System.Threading; namespace WaitPriorities { class Program { static void Main(string[] args) { object Lock = new object(); new Thread(new ParameterizedThreadStart(NoTimeout)).Start(Lock); new Thread(new ParameterizedThreadStart(LongTimeout)).Start(Lock); new Thread(new ParameterizedThreadStart(ShortTimeout)).Start(Lock); //lock (Lock) // Monitor.PulseAll(Lock); lock (Lock) Monitor.Pulse(Lock); lock (Lock) Monitor.Pulse(Lock); lock (Lock) Monitor.Pulse(Lock); } static void NoTimeout(object Lock) { lock (Lock) { Monitor.Wait(Lock); Console.WriteLine("NoTimeout"); } } static void ShortTimeout(object Lock) { lock (Lock) { bool Locked = Monitor.Wait(Lock, 1000); Console.WriteLine("ShortTimeout ({0})", Locked ? "Locked" : "Not locked"); } } static void LongTimeout(object Lock) { lock (Lock) { bool Locked = Monitor.Wait(Lock, 1500); Console.WriteLine("LongTimeout ({0})", Locked ? "Locked" : "Not locked"); } } } } --------------974C23208E5F277BA99B9297-- Tag: Remoting Vs. DCOM Tag: 101257
  - 9
    - Is serialport functional in beta2 on .NET CF? We're trying to do serial comm with the new serialport object in the VS Beta 2/.NET Beta 2 system (using C#, but I don't think that's terribly important). I'm using a slightly cranky GPS receiver, and it works fairly well under Windows, but when hangs hard in the PocketPC 2003 emulator, and on an actual iPaq handheld. Does anyone have a SIMPLE code snippet that works for serial comm for them under the Compact Framework? serPort.ReadLn() or similar would be sufficient. I'd like to see if it's our device, or the serialport object, or improper use of serialport, etc. Many thanks in advance! --Larry Tag: Remoting Vs. DCOM Tag: 101251
  - 10
    - A Question about Control.Invoke I have a code sequence that goes something like this: 1. Start an asynchronous i/o with a completion callback of /cb/ Now when the i/o completes we end up in the /cb/ routine.... note that we are in a pool thread during the callback, not the main form's thread. 2. call the Endxxxx(ar) to retrieve the results of the operation 3. form.Invoke(delegate method, params) 4. do another asynchronous i/o for more data At step 3 we call Invoke to switch to the main form's thread and pass it some data. This is necessary since doing anything with form's controls outside its main thread is not safe. My question is what is Invoke doing under the covers? Does it just launch the delegate with the equivalent of a PostMessage or PostThreadMessage and return straightaway so we can get the next i/o started at step (4), or is step (4) not executed until the delegate method (and any routines it calls in turn) in step (3) completed? I can change Invoke to BeginInvoke if that is what is required. Regards, Oz -- A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? Tag: Remoting Vs. DCOM Tag: 101250
  - 11
    - Application.Run not creating Main Form Sometimes my main form appears and sometimes it doesn't. VS.NET acts as if the process is running and I can click the "stop" button but I get no windows or forms. Here is my code: static void Main() { try{ MainForm frm = new MainForm(); Application.Run( frm ); } catch( System.Exception ex ){ MessageBox.Show( ex.Message ); } } When I debug it, the MainForm constructs just fine but when the execution enters Application.Run( ), the OnLoad event in never called and the window doesn't appear. Then I run it again and it works fine, and I run it again and it doesn't. Does anybody have any ideas about how I can figure out what the problem is. thanks, Dean Rettig Tag: Remoting Vs. DCOM Tag: 101243
  - 12
    - Implementing a namespace over more than one assembly? Hi all, Can anyone tell me if it is advisable (or even possible) to define a namespace across 2 or more assemblies? For example, consider the namespace SampleApplication.Data.Providers Would it be possible to have assembly A define a class as part of that namespace as well as Assembly B also declaring a class to be within it as well? In particular, I have a number of data providers. It would be useful (I think) to declare them in the same namespace, but for the purposes of a demonstration I'm doing, each provider must exisit in its own seperately deployed assembly. Is this possible and is it a good idea? Thanks to anyone who can share some advice! :-) Kindest Regards tce Tag: Remoting Vs. DCOM Tag: 101240
  - 13
    - Delphi 4 & VB.NET, don't play nice?? Hello all, Im stumpped. I have a small app i wrote in VB.NET which takes in a file name, and a bunch of other params, runs the file with the params, and then exits. At the end of the program, it can optionally echo back all the params it received in a msgbox. When the app is run from a command-line, it works beautifully. The report runs, then when you close it, the msgbox pops up with the params that were passed into my launcher program. HOWever.... we have another application, written in Delphi 4, which attempts to run the same command line as we tried running manually. When it is run from the Delphi app, the msgbox with the params never pops up. The Delphi app is shelling out to my app using the delphi command WinExec(). Is there some weird interaction between Delphi 4 and VB.NET or the .NET framework in general, that would prevent this msgbox from showing up??? Im truly stumpped, and really need to figure a way to get around this. Thanks in advance, - Arthur Dent. Tag: Remoting Vs. DCOM Tag: 101238
  - 14
    - Transparency, ASP.NET, and GDI+ I am trying to create graphics with GDI+ that include transparency. However, the transparency never seems to show up, even though my colors have an alpha value of 0. How can I generate a graphic that is completely transparent in certain areas (so that the web page background shows through)? I save my graphics as gif files. I would appreciate, if possible, a simple example so that I can see the code. Thanks. -- Nathan Sokalski njsokalski@hotmail.com http://www.nathansokalski.com/ Tag: Remoting Vs. DCOM Tag: 101236
  - 15
    - How to shut down my windows service Hello. I've created a windows service application. I am also creating a UI for it. I want to add a "Stop Service" button in my UI app, but am unsure how to code the shut down within the service app. Call Dispose()? Thanks in advance, Mike Tag: Remoting Vs. DCOM Tag: 101235
  - 16
    - Can't get IIS to run ASP 1.1 Every time I open up a web application in Visual Studio, I get the following error message: Visual Studio .NET has detected that the specified web server is not running ASP.NET version 1.1. You will be unable to run ASP.NET Web applications or services. Not surprisingly, I'm unable to run any of my ASP.NET web applications. Every time I try to open one of my application's web forms in IE or Firefox, the browser wants to open the file with Visual Studio, which I think is symptomatic of the ASP.NET engine not bothering to generate the appropriate web pages dynamically. However, I believe that I do have ASP.NET 1.1 installed -- it's listed (along with ASP.NET 1.0) in my Add/Remove Programs control panel, for example. Does anybody have some ideas of how I can get my applications running? Thanks a lot, Jay Tag: Remoting Vs. DCOM Tag: 101233
  - 17
    - process.WaitForExit() problem on framework 2.0 beta Hello I have a programm that executes other processes. Everything was fine with framework 1.1. Now i have tested the assembly (still build with VS2003, framework 1.1) on the framework 2.0 beta. Unfortunatly in some cases, the method "process.WaitForExit()" waits infinite. When the process exits, it does not affect the WaitForExit method. If i replace the WaitForExit method with an interop call to kernel32.dll -> WaitForSingleObject it works perfectly again. Berni [System.Runtime.InteropServices.DllImport("kernel32.dll")] private static extern int WaitForSingleObject(IntPtr hHandle, uint dwMilliseconds); ... //this.process.WaitForExit(); WaitForSingleObject(this.process.Handle, 0xFFFFFFFF); Tag: Remoting Vs. DCOM Tag: 101231
  - 18
    - Inserting/Adding objects to Collections Hello I am trying read from a xml file, pull the values in a object and then add the object to an ArrayList. I am using a 'while' loop to move through each node in the xml file and pulling the required values as needed and setting them to the relevant property within my object. The reading of the xml file works as it should. I get a problem when I try to add the object that I created to the arraylist. It seems to be adding each one, but when I view the results of the list, it shows the last object passed in for each object stored within the Arraylist. Here is the code that is giving me issues: public ArrayList readXMLClient(string path, string xPathEx) { XmlDocument document = new XmlDocument(); document.Load(path); XPathNavigator navigator = document.CreateNavigator(); int i = document.DocumentElement.ChildNodes.Count; int j = 0; ClientData objClientData = new ClientData(); ArrayList objArrayList = new ArrayList(); try { XPathNodeIterator _clientCode = navigator.Select(xPathEx + "/ClientCode"); XPathNodeIterator _clientName = navigator.Select(xPathEx + "/ClientName"); XPathNodeIterator _clientDetails = navigator.Select( xPathEx + "/ClientDetails"); while (_clientCode.MoveNext() && _clientName.MoveNext() && _clientDetails.MoveNext()) { objClientData.clientCode = _clientCode.Current.Value.ToString(); objClientData.clientName = _clientName.Current.Value.ToString(); objClientData.clientDetails = _clientDetails.Current.Value.ToString(); objArrayList.Insert(j,objClientData); j++; } } catch(Exception ex) { } return objArrayList; } Any help would be great. Thanking you in advance Vish Tag: Remoting Vs. DCOM Tag: 101225
  - 19
    - Too many pending asynchronous disk write causes spurious errors I am using the asynchronous I/O model to receive data over a socket, and asynchronously write the incoming data to a disk file using FileStream. So long as the pending writes have not yet completed I continue to allocate more read buffers. As a result I can get a backlog of about 250 disk writes (1K buffers, because that is the max size the receiver will give me). During the course of a 50 MB transfer I get about 6 of these errors: 07:42:50.14 System.IndexOutOfRangeException: Probable I/O race condition detected while copying memory. The I/O package is not thread safe by default. In multithreaded applications, a stream must be accessed in a thread-safe way, such as a thread-safe wrapper returned by TextReader's or TextWriter's Synchronized methods. This also applies to classes like StreamWriter and StreamReader. 07:42:50.14 at System.Buffer.InternalBlockCopy(Array src, Int32 srcOffset, Array dst, Int32 dstOffset, Int32 count) 07:42:50.14 at System.IO.FileStream.BeginWrite(Byte[] array, Int32 offset, Int32 numBytes, AsyncCallback userCallback, Object stateObject) 07:42:50.14 at ODP.NMServe.DataChannelSession.ReceiveHandler(IAsyncResult ar) I am obviously doing SOMETHING wrong. I was thinking the FileSystem.BeginWrite was supposed to be safe to work from in the thread pool utilized by the socket read completions. And that there was safe FIFO queueing of requests. The FileStream was opened with the asynchronous option TRUE. I am not sure what the error messages are looking for, what I need to change to avoid this. The disk I am writing to is an SCSI RAID 5 disk array. This runs on a dual processor W2K box. Thanks for any pointers Best regards - Lee Gillie Tag: Remoting Vs. DCOM Tag: 101224
  - 20
    - Disk file write performance Seeking some hints from a real framework asynchronous I/O ru of gu. I am trying to find the absolute fastest way to write binary data to disk files in VB.NET. I am working on an FTP server. In my development testing I have found that I can receive about 60 mbits/sec over the socket data connection using asynchronous reads, with the file writing disabled. When I try to incorporate asynchronous disk writing with FileStream it bogs down to about 4.5 mbits/sec. So I start with only three, but I allocate extra data buffers as needed to keep feeding the socket reads as fast as the system will take them, and obviously not reuse the buffers until the asynchronous disk write completes, and I find my buffer pool grows to about 250 (i.e. up to 250 pending asynchronous disk writes at any one moment). I/O buffers are 1K each. File transfers are about 50 MB. Thanks for any pointers Best regards - Lee Gillie Tag: Remoting Vs. DCOM Tag: 101222
  - 21
    - Exception on Machine Without Visual Studio .Net Installed I have created a mixed mode (managed + native) application that links to a mixed mode dll. It runs fine on all XP machines with Visual Studio .Net installed, but on other machines with the .Net framework installed but not Visual Studio, it displays a pop-up window entitled "Common Runtime Debugging Services," and the unhelpful message: "Application has generated an exception that could not be handled." This happens when the application gets to the managed-code wrapper of a function (C++) that initializes the dll (__crt_dll_initialize) . The error is triggered just before it enters the crt-initializing wrapper function. It won't display a message-box window placed within the function but before the initialization. Try-catch does not catch the error. Depends.exe show no missing or problematic module. The error also is triggered when 0 is assigned to a pointer to a managed class of the dll. Any suggestion would be appreciated. -- sunrat Tag: Remoting Vs. DCOM Tag: 101220
  - 22
    - Uninstall 2005 Beta 2 and reinstall 2003 Hi all, I've uninstalled Visual Studio .Net 2005 Beta 2 and need to reinstall Visual Studio .Net 2003 but I get an error that the .Net Framework 1.1 and J# redistributable packages cannot be installed. Is there a tool to clean up the mess the Beta leaves behind? Thanks, Ivan Tag: Remoting Vs. DCOM Tag: 101219
  - 23
    - General GDI+ Error. I have the following code and when I use it to split a tiff file in seperate tiff files I receive a general gdi+ error. I have no clue what is going wrong. From http://www.codeproject.com/csharp/TiffManager.asp Code: using System; using System.IO; using System.Drawing; using System.Drawing.Imaging; using System.Collections; /// <summary> /// Summary description for TiffManager. /// </summary> public class TiffManager : IDisposable { private string _ImageFileName; private int _PageNumber; private Image image; private string _TempWorkingDir; public TiffManager(string imageFileName) { this._ImageFileName=imageFileName; image=Image.FromFile(_ImageFileName); GetPageNumber(); } public TiffManager() { } /// <summary> /// Read the image file for the page number. /// </summary> private void GetPageNumber() { Guid objGuid=image.FrameDimensionsList[0]; FrameDimension objDimension=new FrameDimension(objGuid); //Gets the total number of frames in the .tiff file _PageNumber=image.GetFrameCount(objDimension); return; } /// <summary> /// Read the image base string, /// Assert(GetFileNameStartString(@"c:\test\abc.tif"),"abc") /// </summary> /// <param name="strFullName"></param> /// <returns></returns> private string GetFileNameStartString(string strFullName) { int posDot=_ImageFileName.LastIndexOf("."); int posSlash=_ImageFileName.LastIndexOf(@"\"); return _ImageFileName.Substring(posSlash+1,posDot-posSlash-1); } /// <summary> /// This function will output the image to a TIFF file with specific compression format /// </summary> /// <param name="outPutDirectory">The splited images' directory</param> /// <param name="format">The codec for compressing</param> /// <returns>splited file name array list</returns> public ArrayList SplitTiffImage(string outPutDirectory,EncoderValue format) { string fileStartString=outPutDirectory+"\\"+GetFileNameStartString(_ImageFileName); ArrayList splitedFileNames=new ArrayList(); try { Guid objGuid=image.FrameDimensionsList[0]; FrameDimension objDimension=new FrameDimension(objGuid); //Saves every frame as a separate file. Encoder enc=Encoder.Compression; int curFrame=0; for (int i=0;i<_PageNumber;i++) { image.SelectActiveFrame(objDimension,curFrame); EncoderParameters ep=new EncoderParameters(1); ep.Param[0]=new EncoderParameter(enc,(long)format); ImageCodecInfo info=GetEncoderInfo("image/tiff"); //Save the master bitmap string fileName=string.Format("{0}{1}.TIF",fileStartString,i.ToString()); image.Save(fileName,info,ep); splitedFileNames.Add(fileName); curFrame++; } } catch (Exception) { throw; } return splitedFileNames; } /// <summary> /// This function will join the TIFF file with a specific compression format /// </summary> /// <param name="imageFiles">string array with source image files</param> /// <param name="outFile">target TIFF file to be produced</param> /// <param name="compressEncoder">compression codec enum</param> public void JoinTiffImages(string[] imageFiles,string outFile,EncoderValue compressEncoder) { try { //If only one page in the collection, copy it directly to the target file. if (imageFiles.Length==1) { File.Copy(imageFiles[0],outFile,true); return; } //use the save encoder Encoder enc=Encoder.SaveFlag; EncoderParameters ep=new EncoderParameters(2); ep.Param[0]=new EncoderParameter(enc,(long)EncoderValue.MultiFrame); ep.Param[1] = new EncoderParameter(Encoder.Compression,(long)compressEncoder); Bitmap pages=null; int frame=0; ImageCodecInfo info=GetEncoderInfo("image/tiff"); foreach(string strImageFile in imageFiles) { if(frame==0) { pages=(Bitmap)Image.FromFile(strImageFile); //save the first frame pages.Save(outFile,info,ep); } else { //save the intermediate frames ep.Param[0]=new EncoderParameter(enc,(long)EncoderValue.FrameDimensionPage); Bitmap bm=(Bitmap)Image.FromFile(strImageFile); pages.SaveAdd(bm,ep); } if(frame==imageFiles.Length-1) { //flush and close. ep.Param[0]=new EncoderParameter(enc,(long)EncoderValue.Flush); pages.SaveAdd(ep); } frame++; } } catch (Exception) { throw; } return; } /// <summary> /// This function will join the TIFF file with a specific compression format /// </summary> /// <param name="imageFiles">array list with source image files</param> /// <param name="outFile">target TIFF file to be produced</param> /// <param name="compressEncoder">compression codec enum</param> public void JoinTiffImages(ArrayList imageFiles,string outFile,EncoderValue compressEncoder) { try { //If only one page in the collection, copy it directly to the target file. if (imageFiles.Count==1) { File.Copy((string)imageFiles[0],outFile,true); return; } //use the save encoder Encoder enc=Encoder.SaveFlag; EncoderParameters ep=new EncoderParameters(2); ep.Param[0]=new EncoderParameter(enc,(long)EncoderValue.MultiFrame); ep.Param[1] = new EncoderParameter(Encoder.Compression,(long)compressEncoder); Bitmap pages=null; int frame=0; ImageCodecInfo info=GetEncoderInfo("image/tiff"); foreach(string strImageFile in imageFiles) { if(frame==0) { pages=(Bitmap)Image.FromFile(strImageFile); //save the first frame pages.Save(outFile,info,ep); } else { //save the intermediate frames ep.Param[0]=new EncoderParameter(enc,(long)EncoderValue.FrameDimensionPage); Bitmap bm=(Bitmap)Image.FromFile(strImageFile); pages.SaveAdd(bm,ep); bm.Dispose(); } if(frame==imageFiles.Count-1) { //flush and close. ep.Param[0]=new EncoderParameter(enc,(long)EncoderValue.Flush); pages.SaveAdd(ep); } frame++; } } catch (Exception ex) { #if DEBUG Console.WriteLine(ex.Message); #endif throw; } return; } /// <summary> /// Remove a specific page within the image object and save the result to an output image file. /// </summary> /// <param name="pageNumber">page number to be removed</param> /// <param name="compressEncoder">compress encoder after operation</param> /// <param name="strFileName">filename to be outputed</param> /// <returns></</returns> public void RemoveAPage(int pageNumber,EncoderValue compressEncoder,string strFileName) { try { //Split the image files to single pages. ArrayList arrSplited=SplitTiffImage(this._TempWorkingDir,compressEncoder); //Remove the specific page from the collection string strPageRemove=string.Format("{0}\\{1}{2}.TIF",_TempWorkingDir,GetFileNameStartString(this._ImageFileName),pageNumber); arrSplited.Remove(strPageRemove); JoinTiffImages(arrSplited,strFileName,compressEncoder); } catch(Exception) { throw; } return; } /// <summary> /// Getting the supported codec info. /// </summary> /// <param name="mimeType">description of mime type</param> /// <returns>image codec info</returns> private ImageCodecInfo GetEncoderInfo(string mimeType) { ImageCodecInfo[] encoders=ImageCodecInfo.GetImageEncoders(); for (int j=0;j<encoders.Length;j++) { if (encoders[j].MimeType==mimeType) return encoders[j]; } throw new Exception( mimeType + " mime type not found in ImageCodecInfo" ); } /// <summary> /// Return the memory steam of a specific page /// </summary> /// <param name="pageNumber">page number to be extracted</param> /// <returns>image object</returns> public Image GetSpecificPage(int pageNumber) { MemoryStream ms=null; Image retImage=null; try { ms=new MemoryStream(); Guid objGuid=image.FrameDimensionsList[0]; FrameDimension objDimension=new FrameDimension(objGuid); image.SelectActiveFrame(objDimension,pageNumber); image.Save(ms,ImageFormat.Bmp); retImage=Image.FromStream(ms); return retImage; } catch (Exception) { ms.Close(); retImage.Dispose(); throw; } } /// <summary> /// Convert the existing TIFF to a different codec format /// </summary> /// <param name="compressEncoder"></param> /// <returns></returns> public void ConvertTiffFormat(string strNewImageFileName,EncoderValue compressEncoder) { //Split the image files to single pages. ArrayList arrSplited=SplitTiffImage(this._TempWorkingDir,compressEncoder); JoinTiffImages(arrSplited,strNewImageFileName,compressEncoder); return; } /// <summary> /// Image file to operate /// </summary> public string ImageFileName { get { return _ImageFileName; } set { _ImageFileName=value; } } /// <summary> /// Buffering directory /// </summary> public string TempWorkingDir { get { return _TempWorkingDir; } set { _TempWorkingDir=value; } } /// <summary> /// Image page number /// </summary> public int PageNumber { get { return _PageNumber; } } #region IDisposable Members public void Dispose() { image.Dispose(); System.GC.SuppressFinalize(this); } #endregion } Tag: Remoting Vs. DCOM Tag: 101217
  - 24
    - Custom Class - Different Instances Hello, I have a custom component class that I created that will basically save x amount of "objects." Once x + 1 object pops in, the oldest one falls off. It works great as I have it. In my test web page I create a Static object and use the New to create a new instance of it. If I don't use the Static, nothing is remembered. The only problem is, when I start a second page, I expect it to have a NEW instance of the class but the numbers stored show up the same. How do I get it to always create a New instance. Am I missing the public, private, protected, internal - modifiers in the wrong position? Please help. - - - - - - - Class File: using System; using System.ComponentModel; using System.Collections; using System.Diagnostics; namespace NASQLStatements { public class ThingsRemembered : System.ComponentModel.Component { private System.ComponentModel.Container components = null; private int iThingsToRemember; protected internal ArrayList aThings; public ThingsRemembered(System.ComponentModel.IContainer container) { container.Add(this); InitializeComponent(); aThings = new ArrayList(2); } public ThingsRemembered() { InitializeComponent(); aThings = new ArrayList(2); } public ThingsRemembered(int iCapacity) { InitializeComponent(); aThings = new ArrayList(iCapacity); } public ThingsRemembered(System.ComponentModel.IContainer container, int iCapacity) { container.Add(this); InitializeComponent(); aThings = new ArrayList(iCapacity); } protected override void Dispose( bool disposing ) { if( disposing ) { if(components != null) { components.Dispose(); } } base.Dispose( disposing ); iThingsToRemember = 0; aThings.Clear(); // delete all items aThings.TrimToSize(); // resize the array to system default } #region Component Designer generated code private void InitializeComponent() { components = new System.ComponentModel.Container(); } #endregion public int ThingsToRemember { get { return iThingsToRemember; } set { iThingsToRemember = value; aThings.Capacity = iThingsToRemember; // size the array } // set } // ThingsToRemember - Property - Read/Write public bool AddAThing(object oThing) { try { if(aThings.Count == aThings.Capacity) { aThings.RemoveAt(0); // remove the oldest one } // if there are already the maximum number of items in the array aThings.Add(oThing); // add the new one return true; } catch(Exception e) { sLastError = e.ToString(); return false; } // try-catch errors } // AddAThing - Method public string LastError { get { return sLastError; } } // LastError - Property - Read Only public object LastThing() { return aThings[aThings.Count - 1]; } // LastThing - Method public object FirstThing() { return aThings[0]; } // FirstThing - Method public ArrayList AllThings { get { return aThings; } } // AllThings - Property - Read Only } } - - - - - - - Test File: using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; using NASQLStatements; namespace TestThings { public class WebForm1 : System.Web.UI.Page { protected System.Web.UI.WebControls.Button cmndAddThing; protected System.Web.UI.WebControls.Button cmndShowThings; protected System.Web.UI.WebControls.Label lablThings; private static NASQLStatements.ThingsRemembered oStuff = new NASQLStatements.ThingsRemembered(); private void Page_Load(object sender, System.EventArgs e) { if(!Page.IsPostBack) { oStuff.ThingsToRemember = 5; lablThings.Text = oStuff.AllThings.Capacity.ToString() + "<br>" + oStuff.AllThings.Count.ToString(); } // if this is the first time to the page } #region Web Form Designer generated code override protected void OnInit(EventArgs e) { InitializeComponent(); base.OnInit(e); } private void InitializeComponent() { this.cmndAddThing.Click += new System.EventHandler(this.cmndAddThing_Click); this.cmndShowThings.Click += new System.EventHandler(this.cmndShowThings_Click); this.cmndError.Click += new System.EventHandler(this.cmndError_Click); this.Load += new System.EventHandler(this.Page_Load); } #endregion private void cmndShowThings_Click(object sender, System.EventArgs e) { lablThings.Text = "" + oStuff.AllThings.Capacity.ToString() + "<br>"; for(int iPos = oStuff.AllThings.Count - 1; iPos >= 0; iPos--) { lablThings.Text += oStuff.AllThings[iPos].ToString() + "<hr>"; } // for each item } private void cmndAddThing_Click(object sender, System.EventArgs e) { Random rRandom = new Random(DateTime.Now.Millisecond); int iValue = rRandom.Next(1, 1000); lablThings.Text += "<br>" + oStuff.AddAThing(iValue).ToString(); } } } As you can see, in the Test file I declare the Class as private static and do a NEW. I assumed the New is necessary so it can create a New instance of it. If it take out the Static modifier, nothing works and no random numbers are stored. If I leave it in, it will remember the number (5) I have told it. But so will each new web page I bring up and point to that page. Please help. -- Thanx, Kevin Tag: Remoting Vs. DCOM Tag: 101212
  - 25
    - COM exception Error after Installing windows 2003 service pack 1 Hi, I developed an ASP.NET Web application and 3rd party COM component is used in this application(Not using COM+, so component is not available in Component Services). This code was working fine before migrating to Windows 2003 SP1. But I am getting the following error after migrating to Windows 2003 SP1 when creating an COM component in ASP.NET (C# Web Services). However, it is working fine in C# application after migrating to Windows SP1. Thanks -Amar Tag: Remoting Vs. DCOM Tag: 101210

Hey,
If I don't need to worry about security, but performance is a big
issue, should I use Remoting or EnterpriseServices with DCOM to connect
my clients to my server?
Besides performance, what other advantages/disadvantages are there for
each of them, and what about Indigo?
Thanks ahead

Ram

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Re: Remoting Vs. DCOM by hB

hB
Mon Aug 15 05:10:13 CDT 2005

It depends what type of communication you want to achieve between
server and the clients.

If... (in general)
Its better to do Remoting with RAW TCP/IP binary streams, it will be
best solution performance wise in the dotnet.
(there could be nothing faster than direct sockets and binary streams
(udp even more, but no streams))

For adv/disadv:
http://www.theserverside.net/discussions/thread.tss?thread_id=35073
http://groups.google.ae/group/microsoft.public.dotnet.framework.remoting/browse_thread/thread/fc2bb42359bfaaee/73dab004adb8c51f?lnk=st&q=COM%2B+Web+Services+Remoting&rnum=1#73dab004adb8c51f
http://groups.google.ae/group/microsoft.public.dotnet.framework.remoting/browse_thread/thread/660563546cc7868e/c781e2faa9f0ced0?lnk=st&q=COM%2B+Web+Services+Remoting&rnum=5#c781e2faa9f0ced0

type "COM+ Web Services Remoting" in groups.google.com :)

---
hB

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RE: Remoting Vs. DCOM by NoSpamMgbworld

NoSpamMgbworld
Mon Aug 15 07:37:27 CDT 2005

DCOM might (the key word is MIGHT, not WILL) work a bit faster with very
small messages. Beyond that, the extra layers on both sides of the
communication will bog it down. For that reason, I would head towards
Remoting first.

All of the upcoming technologies are XML based, so they are more akin to
Remoting than DCOM.

--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA

***************************
Think Outside the Box!
***************************

"Ram" wrote:

> Hey,
> If I don't need to worry about security, but performance is a big
> issue, should I use Remoting or EnterpriseServices with DCOM to connect
> my clients to my server?
> Besides performance, what other advantages/disadvantages are there for
> each of them, and what about Indigo?
> Thanks ahead
>
> Ram
>
>

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Re: Remoting Vs. DCOM by Ram

Ram
Tue Aug 16 12:58:45 CDT 2005

Thanks for both of your replies!
Gregory - XML based technologies/protocols are all fine and sexy, but
when talking about performance, they are a lot behind (and will always
be???) DCOM/Remoting - binary based technologies...
My application will be transferring big chunks of data and must have
high performance - so XML based technologies i.e Web Services are out
of question...
Bottom line, even though .Net Remoting is managed and is closed to
Indigo, DCOM offers me more standard and reliable framework, with built
in monitoring (the Com+ MMC), better performance (like you said) and of
the little I read about .Net Remoting, I understand that it is'nt 100%
managed as well, and the path from V1.1 Remoting to Indigo is not as
clean as other technologies (EnterpriseServices???) so I might as well
stick to what technology right now is more comfortable...
Please tell me what you think, and again thanks for replying!

Ram

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