Read stream into structure from System.IO
Hi,
I encounter one problem about System.IO. I have a binary file that contains
following structure,
struct MyFormat
{
public sbyte Type;
public sbyte[] Num;
public sbyte Flag;
public sbyte[] Name;
}
Question 1: How can I assign the length of Num to 5, such as "public
sbyte[15] Num;" like C++?
Question 2: How can I read this binary file into structure one by one?
Thanks!! Tag: If there is some problem when migrate from PC to Embed chip Tag: 62969
October 2003 .NET Framework SDK Documentation Update
Hi,
Is anybody here able to install the October 2003 SDK Documentation update
available on this page:
http://www.microsoft.com/downloads/details.aspx?FamilyId=2EAEB501-C197-4892-9C50-8F6BE1B0D4E0&displaylang=en
I got an error message saying that
"The upgrade patch cannot be installed by the Windows Installer service
because the program to be upgraded may be missing, or the updgrade patch may
update a different version of the program. Verify that the program to be
upgraded exists on your computer and that you have the correct upgrade
patch."
It's so strange since I have both .NET Framework SDK version 1.1. and MSDN
April 2003 installed on my machine. Also, I use the same language (English)
for both.
Thanks. Tag: If there is some problem when migrate from PC to Embed chip Tag: 62967
System.IO.PathTooLongException
Hi,
(This is a repost - I posted this last week, but
misspelled my email alias.)
The documentation states that this "exception is
thrown when a pathname or filename is longer than the
system-defined maximum length". In my case, this max.
length is 260 characters on WinXP. Is there any way to
change this value? If not, are there any workarounds?
Thanks,
Donald Xie Tag: If there is some problem when migrate from PC to Embed chip Tag: 62954
Problem installing .Net Framework SP2
I have 1.1 of the framework with SP1 already installed on my machine and am
trying to install the .Net Framework Service Pack 2. I get this message:
"The upgrade patch cannot be installed by the Windows Installer service
because the program to be upgraded may be missing, or the upgrade patch may
update a different version of the program. Verify that the program to be
upgraded exists on your computer and that you have the correct upgrade
patch."
Tried it on another machine with just 1.1 on it with no service packs and
still get the same message, I also have the compact framework SP1
installed.
Bit lost in all the versions and service packs at the moment
Derek Tag: If there is some problem when migrate from PC to Embed chip Tag: 62953
XmlDocument read from Network Stream
I have been using the following code (successfully) to read Xml formated
text packets from a TCP stream. The output from the server stream consists
of a sequence of well formed Xml documents written to the output stream.
We are willing to pay $ to any expert (e.g. MVP) consultant who has to time
to help us track down this problem.
(we will discuss rates if you can prove your expertise, and problem solving
approach).
The code below is for the client that is reading the stream.
All this worked well, as long as long delays were between each "packet". But
when multiple packets are sent in quick succession, it is dropping packets.
I have been trying to do this more "correctly" with using a XmlTextReader,
but with no luck.
E.g.
XmlTextReader r = new XmlTextReader();
reader.MoveToContent();
string s = reader.ReadOuterXml();
dgram.Load(s);
It basically hangs on the ReadOuterXml();
Here is the original "working" code:
--------------------------------------------
private void OrchTalk()
{
int bytesRead = 0;
XmlDocument dgram = new XmlDocument();
while (true)
{
byte[] buffer = new byte[1024]; // buffer for socket read stream
bytesRead = 0;
try { bytesRead = oStream.Read(buffer, 0, buffer.Length); }
catch (Exception e)
{
if (stateCode == Common.stateCodes.shutdown) {break;}
Tools.Debug(10, "OrchTalk: read error {0} ", e.ToString());
break;
}
if (bytesRead == 0)
{
if (this.stateCode == Common.stateCodes.shutdown)
{
Tools.Debug(10, "OrchTalk: Orchestrator died");
this.Disconnect();
return;
}
break;
}
else
{
string s = Tools.ByteToStr(buffer, 0);
try { dgram.LoadXml(s); }
catch (Exception e)
{ Tools.Debug(0, "OnReadComplete: {0} Runt packet: {1}", e.ToString(),
s); }
int endTime = Environment.TickCount;
this.inPacket = dgram.DocumentElement;
Tools.Debug(10, "packet: {0}", inPacket.OuterXml);
this.Dispatch();
int startTime = (int)this.stats["start"];
int elapsed = endTime - startTime;
this.stats["stop"] = endTime;
this.stats["time"] = elapsed;
this.stats["bytes"] = bytesRead;
this.stats["packetText"] = inPacket.OuterXml;
if (StationMaster.isConnected)
{
string outPacket = inPacket.OuterXml;
FlashComm.itself.Send(outPacket);
}
}
}
this.Disconnect();
} Tag: If there is some problem when migrate from PC to Embed chip Tag: 62952
race conditions caused by Thread.Abort
I have been looking for ways to prevent asynchronous
Thread.Abort calls from wreaking havoc in my code. I'm
working on an assembly, implemented in Managed Extensions
for C++, that makes unmanaged calls and often needs to
free resources associated with those calls:
bool allocated = false;
try
{
...
// Allocate some resources in unmanaged code
allocated = AllocateUnmanagedResources();
...
}
__finally
{
// Only free resources if allocation was successful
if (allocated)
FreeUnmanagedResources();
}
This code should work fine if the thread running it is not
aborted. However, asynchronously aborting the thread can
lead to two problems:
- The ThreadAbortException can be thrown from inside the
__finally block, causing the resources to be leaked. This
possibility is noted in the Thread.Abort documentation.
- The ThreadAbortException can be thrown after a
successful call to AllocateUnmanagedResources but before
the assignment to the boolean variable. In that case, the
code in the __finally block isn't aware of the current
state, so the resources are leaked.
Both of these scenarios seem to be the result of
deficiencies in the .NET Framework and/or CLR:
1) __finally blocks aren't guaranteed to run to completion
2) There doesn't seem to be a way to create
an "unabortable" block of code. Obviously, this kind of
feature could be abused (and would preclude the need for
(1) above), but it seems necessary in order to allow clean-
up code to know the state of the application.
Anyway, I'm looking for ways to eliminate the race
conditions described above. So far, the only solution
I've found is to surround the whole block with a
try/catch, and push the state variable assignment into
unmanaged code (which can't be aborted):
#pragma unmanaged
// Error-checking ignored for clarity
void AllocationWrapper(bool* pAllocated)
{
*pAllocated = AllocateUnmanagedResources();
}
void DeallocationWrapper(bool* pAllocated)
{
if (*pAllocated)
{
FreeUnmanagedResources();
*pAllocated = false;
}
}
#pragma managed
bool allocated = false;
try
{
try
{
...
AllocationWrapper(&allocated);
...
}
__finally
{
DeallocationWrapper(&allocated);
}
}
catch (ThreadAbortException*)
{
DeallocationWrapper(&allocated);
}
Can anyone think of a cleaner way to remove the race
conditions? Something in the language or framework I've
missed? A configuration setting that magically disables
Thread.Abort?
Thanks... Tag: If there is some problem when migrate from PC to Embed chip Tag: 62950
RunDll or remote activation needed
In the .NET Framework Developer's Guide there is a page
titled Building a Host application.
Within this page there is a note:
Unlike COM, remoting does not start the host or server
application for you. This is an important difference
between .NET remoting and remote activation in COM.
I need this functionality.
I need to be able to start a seperate win32 process and
communicate with it.
The trick is that there must not be any need for
configuration files or such.
I could approach the problem one of two ways.
Either my client dll can reference the server exe (but
referencing an exe is not allowed by the IDE).
Or I can reference and execute a dll.
The reason I want to reference it is to make sure that VS
always puts a copy of it where I can find it, so I can
execute it.
Another possibility is to make the server app also a COM
server and just register it that way, but this is not
managed and VS will not register an exe this way. Tag: If there is some problem when migrate from PC to Embed chip Tag: 62948
Accessing Form Controls From Threaded Delegate via Async Callbacks.
I have a Form that hosts a control (used for visual
feedback).
From this form a Class is created.
This Class has several events/delegates that are triggered
by a Socket (which is a member of the class)'s Async
Callbacks. [Eg OnConnected, etc ].
From within this delegate eg. OnConnected, OnReceivedData
and OnClose I need a way to be able to provide visual
feedback to the form.
I setup an event/delegate on the Form and made it public
so others could access it. A refernece to the Form was
passed to the Class when it was created.
However the minute i call Parent.Invoke
(Parent.VisualMethod,......) the program hangs. Trapped
inside a Try catch to catch any exceptions the program
just hangs. I've stepped through the code and when I step
into that line the program and debugger never come back.
I've tried Control.Invoke, new DelegateMethod(parameters),
Parent.VisualControl.Methodstoupdate
Maybe there is something here I dont quite fully
understand. Maybe there is something very simple that I'm
missing. Or Maybe there is an alternate method of
achieving my goal. Tag: If there is some problem when migrate from PC to Embed chip Tag: 62947
host normal jscript or vbscript in .net
I'd like to be able to run normal JScript or VBScript (not .Net) from inside
a dotnet application, and let the script access certain object at least
through COM.
I don't want to use the jscript.net VsaEngine implementation because I need
to compile and run ALOT of small bits of code and memory is an issue when
you can't unload those emitted assemblies. Tag: If there is some problem when migrate from PC to Embed chip Tag: 62944
working with TCP/IP
I have a client server application where the client sends mouse movements
and text to the server like "MVU 15" would move the mouse up 15 pixels and
"CHAR a" would send an 'a' to the current application. The problem I am
having is that when I try to send a string of chars I get multiple sends
when I read from the TCP/IP stream for instance on one read I might get
"CHAR aCH" then the next read I will get "AR bCH" which obviously breaks my
code.
I am using the following code to send the data
---------------------------
System.IO.StreamWriter NStream;
client = new System.Net.Sockets.TcpClient();
client.Connect(System.Net.IPAddress.Parse(strIPAddress),6254);
NStream = new System.IO.StreamWriter(client.GetStream());
NStream.Write(s);
NStream.Flush();
---------------------------
and the following to read the data
---------------------------
skt = listener.AcceptSocket();
byte[] b = new byte[15];
res = skt.Receive(b);
----------------------------------------
I was thinking i will pad the data to 15 chars but it doesn't seem to be a
problem for most things, but that might have been a result of the speed it
was sent.
Any ideas would be great.
Thanks in advance,
~Logan Tag: If there is some problem when migrate from PC to Embed chip Tag: 62943
pwdLastSet and other Active Directory Date types
Has anyone been able to get the "date" properties (pwdLastSet, lastLogon,
etc.) from Active Directory using JUST the native .Net tools (no com interop
with activeds)? When I try to do that, I get strange results. Consider the
following simple code:
(for this a .Net reference is set to System.DirectoryServices)
Private Function Test(ByVal sLDAPPath As String)
Dim de As New DirectoryEntry(sLDAPPath)
Dim sr As SearchResult
Dim ds As New DirectorySearcher(de)
Dim lTemp As Long
ds.PropertiesToLoad.Add("pwdLastSet")
ds.PropertiesToLoad.Add("lastLogon")
sr = ds.FindOne
If sr Is Nothing Then
'not found
Else
lTemp = sr.Properties.Item("pwdLastSet")(0)
End If
End Function
With MY user ID, lTemp ends up with 127133852422713849. That's fine, I can
use a DateTime.FromFileTime, but it comes back with a date that is about a
day off from what I get back using the interop (not just the UTC time
difference). I get similar results on other accounts (sometimes it is very
close, other times it is WAY off. When I use the Microsoft sample "Active
Directory Browser" (adsvw.exe) it shows this value should be
127133856717681145. Again, similar results on other accounts.
Samples:
above code adsvw.exe
127129877390570772 126626200214730160
126625284477162600 126625284477162600 (yes, this one comes out
the SAME!!!)
I know I can use something like this:
Private Sub Test(ByVal sLDAPPath As String)
Dim objUser As ActiveDs.IADsUser
objUser = GetObject(sLDAPPath)
Dim dt As Date = objUser.PasswordLastChanged()
End Sub
And it will work (as long as I referenced ActiveDS), but I do not really
want to ship the Interop.ActiveDS.dll along (or use COM) for this.
Anyone "been there, done that - solved it" that would share?
Thanks!
Jerry Tag: If there is some problem when migrate from PC to Embed chip Tag: 62939
dictionary with multiple object under the same key
Hi All,
Is the a dictionary some place where multiple objects can be collected under
one key ? like...
dictionary.add( "a", "about" );
dictionary.add( "a", "after" );
Took a look at hashtable etc. and others but they don't support it.
thanks, Tag: If there is some problem when migrate from PC to Embed chip Tag: 62937
Input panel with more then one form
Hi,
If my application has two forms and the user needs to fill in some textboxes
on each of then, how may inputpanels do I need.
When I put one on the first form it works fine, but if I put one on the
second form as well, exceptions occeur.
If I need only one, how can I enable it from the second form?
I'm using VB.NET to write a smartapplication.
thanks,
Eric Tag: If there is some problem when migrate from PC to Embed chip Tag: 62936
Any suggestions to this notouch app issue?
Hi
I have developed a little windows forms wich is supposed to be deployed with
NoTouch (smart client) technolgy.
Since a nice GUI is essential for the app i have used transparency to give i
at nice look. But then the framework wrap my nice gui in a standard form!!
Look at this: http://pings.dk/notouchgui.jpg
Any suggestions? I tried this.FormBorderStyle =
System.Windows.Forms.FormBorderStyle.None; after the app has loaded.
But i has no effect. I guess the framework is wrapping another application
around my application. But WHY!. I cant be a security restrcitions since it
does no harm to the client...(i guess?!?)
Hope some have a suggstion to remove it (still using smart client tech...of
course)
Thx in reagards
Anders, Denmark
x-postet in microsoft.public.dotnet.framework,
microsoft.public.dotnet.framework.windowsforms,
microsoft.public.dotnet.languages.csharp Tag: If there is some problem when migrate from PC to Embed chip Tag: 62935
Issue arbitrary DOS commands
Is there a way to issue an arbitrary DOS commands and see
the output? The commands will be entered by the user
into a text box. I want to be able to handle commands
like DIR, COPY, DELETE, etc. I know I could write the
code for each of these commands, but I won't necessarily
know all of the possible commands that will be issued. I
would like to take the text that the user enters into the
text box and issue that command as if the process were at
a Windows Command prompt.
I have looked at System.Diagnostics.Process and
System.Diagnostics.ProcessStartInfo but that only seems
to handle executing programs, not necessarily issuing
commands.
Mark Tag: If there is some problem when migrate from PC to Embed chip Tag: 62933
Databound Dropdownlist....
I have a databound dropdown list that is using a SQL database to pull
an ID field (CVID) as the Value and a name field (ContractVehicle) as
the Text. The dropdown populates perfectly from the database however
when I attempt to submit the selection to the database using
me.ddPMID.DataValueField I receive an error saying that string "CVID"
cannot be converted to type integer. The Value field should contain
integers as each of them are autonumbered by the database. The code I
am using to populate the dropdownlist follows. Any help would be
greatly appreciated.
Dim connString As String =
"server=192.168.25.245;uid=sa;pwd=nuts@sigcom!-1;Initial
Catalog=SIGCOMproposal"
Dim conn As SqlConnection = New SqlConnection(connString)
Dim sql As String = "SELECT * FROM tblContractVehicle ORDER BY
ContractVehicle"
Dim da As SqlDataAdapter = New SqlDataAdapter(sql, conn)
Dim ds As DataSet = New DataSet()
da.Fill(ds, "tblContractVehicle")
Dim dt As DataTable
dt = ds.Tables(0)
dt.DefaultView.Sort = "ContractVehicle"
Me.ddCVID.DataSource = dt.DefaultView
Me.ddCVID.DataTextField = "ContractVehicle"
Me.ddCVID.DataValueField = "CVID"
Me.ddCVID.DataBind()
Me.ddCVID.Items.Insert(0, "--Select a Contract Vehicle--")
Me.ddCVID.Items(0).Value = "0"
conn.Close() Tag: If there is some problem when migrate from PC to Embed chip Tag: 62932
Clearing the download cache on client machines
Is there an elegant way to clear the download cache on a client machine? We
are deploying a winforms browser and smart client application. Recently we
made a mistake with versioning (we release a version with a very large
number), and now our internal clients can't download a newer version. Since
this is still in house we can install gacutil on people's machines and get
it to clear the cache. But this got me thinking, what could we do if this
happened with an internet deployed version of application? How does a
normal end-user clear their download cache? We can't ask an end-user to
install a utility, that would violate the entire purpose of creating a
smart-client that runs at the internet trust level. We clearly can't get
people to install gacutil.
Any idea what to do?
Mark Levison "in smart client deployment heck" Tag: If there is some problem when migrate from PC to Embed chip Tag: 62929
Getting a list of Roles a user belongs to using Windows Security Principal
Hi
I have created a windows application in .NET using C# here is the Code
Snipp
public static void Main() {
...
// Tell the CLR to use Windows security
AppDomain.CurrentDomain.SetPrincipalPolicy(
PrincipalPolicy.WindowsPrincipal);
// Get the current principal object
WindowsPrincipal prin =
(WindowsPrincipal) Thread.CurrentPrincipal;
// Determine whether the user is an admin
Boolean fAdmin = prin.IsInRole(WindowsBuiltInRole.Administrator);
Console.WriteLine("Administrator:" + fAdmin);
}
As you can see I can determine if the current user belongs to Adminstartor,
but is there a method
where I can get the list of Roles that a particualr use belongs to.
Moreover what is the String equivalent of WindowsBuiltInRole.Administrator
so that I can use that
string in the method
WindowsPrincipal.IsInRole(String);
voeivk Tag: If there is some problem when migrate from PC to Embed chip Tag: 62927
Asynchronous socket problem w/datagrid
Hi All -- I am new to VB.Net so bear with me.
I have an application where I need to connect to a remote tcp port
synchronously, and then asynchronously wait for a data stream to come
from the connection. As data comes in, I want to parse it and add it
to a DataSet, to be displayed in a Windows Form Datagrid.
To test the idea without fooling with the dataset/datagrid, I wrote my
raw asynchronous response to a TextBox using a Receive/ReceiveCallback
function pair, as per the MS examples. This works fine with no UI
problems.
Now that I have added the DataGrid into the mix, any time I do
anything (click, scroll, select a cell, resize column) to the UI of
the datagrid, it seems like the IO is blocking and the application
freezes until some data gets passed and/or the MS Gods are satisfied.
I'm not sure what's going on. If I turn off the I/O, the datagrid
acts fine. If I don't try to populate the datagrid from my
ReceiveCallback function, but rather with static data on Form_Load,
that works fine too. When I combine the datagrid with the updates
from ReceiveCallback, it gets stuck.
Any help appreciated.
Thanks,
Dave Tag: If there is some problem when migrate from PC to Embed chip Tag: 62925
Interacting with a service?
Hey,
I'm trying to build a component that satisfies the
following properties:
1) only one component is ever created and it maintains
its state
2) it can be accessed by any thread on the local machine
simultaneously (I will do the synchronization myself
since I want read/write locks)
3) the component is never deleted
4) I need to call some of its methods
It seems like component services are the way to go (or
maybe Windows services?) but I can't figure out how to
keep the component alive without using JITA. And if I use
JITA, synchronization is done for me. And if I use a
Windows service, I don't seem to be able to call methods
on it.
Any suggestions of resources or ideas I can investigate?
Thanks in advance. Tag: If there is some problem when migrate from PC to Embed chip Tag: 62921
overriding operator* in managed c++
is it possible?
i see one can override operator+ with op_increment, is there an equivalent
for operator*, or has it depreciated for being unsafe?
cheers,
g. Tag: If there is some problem when migrate from PC to Embed chip Tag: 62918
ISerializable and SerializableAttribute confusion
Hi !
This question was discussed once, but the subject is still unclear:
According to Jeffrey Richter article
(http://msdn.microsoft.com/msdnmag/issues/02/04/net/default.aspx) one
can't serialize the type without declaring it with
SerializableAttribute. At the same time, we have to impalement
ISerializable if we need some custom serialization. In addition, we
find the following in MSDN: "Apply the SerializableAttribute attribute
even if the class also implements the ISerializable interface to
control the serialization process."
(http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemSerializableAttributeClassTopic.asp).
From all this it can be concluded that ISerializable and
SerializableAttribute are not intended to be used one instead of
other, but in addition (if needed).
However, in Marshal-By-Value Objects section
(http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconremotableobjects.asp)
I find the following:
"Marshal-by-value (MBV) objects declare their serialization rules
(either by implementing ISerializable to implement their own
serialization, or by being decorated with SerializableAttribute, which
tells the system to serialize the object automatically)"
The "or" there at the middle confuses me...
Thanks for clarification.
Jean Tag: If there is some problem when migrate from PC to Embed chip Tag: 62913
.net equivalent for 'Microsoft Web Browser' com object
Is there a .net component which allows me to have a browser object in my vb
project ?
All it should do is display html files, allow me to navigate to a page, and
allow 'next' and 'previous'. Tag: If there is some problem when migrate from PC to Embed chip Tag: 62910
How to intercept outgoing mail from MS exchange server
Hi!
Does anybody know if it is possible to implement functionality like MS
Exchange Connector gateway using C# code and dotnet. A would like to catch
messages outgoing from MS Exchange server with particular email address mask
and send them out using proprietary communication sistem since these are
virtual email addresses that are not really connected to internet.
Any advice is welcome.
Thanks, Brane Tag: If there is some problem when migrate from PC to Embed chip Tag: 62906
set header Footer of word document
hello
please help to set header footer of word document using
vb.net program
Thank you
Manesh Tag: If there is some problem when migrate from PC to Embed chip Tag: 62896
Using The Equivalent Of 'On Error Resume Next' In A Try/Catch
Hi All.
I have a try catch block which may encouter an error with an empty field:
***** Code Start *****
Try
txtPartNumber.Text = Datarow.Item("PartNumber")
txtPartDescription.Text = Datarow.Item("PartDescription")
txtPartNumber.Text = Datarow.Item("PartNumber")
Catch ex as system.exception
End Try
***** Code End *****
I would like to use something like the old on error resume next, which would
ignore the error and continue with the next line of code.
How would i do this in this example?
One way is to enclose each statement in a try catch itself, but this makes
the code look terrible, whereby it was easy enought pre-,net with the on
error resume next.
Many Thanks
Alex Stevens Tag: If there is some problem when migrate from PC to Embed chip Tag: 62894
Asynchronous calls
Hi all,
Is there a way to cancel an asynchronous call?
For example, using the Socket class, if you call BeginReceive, can you
cancel the call if some timeout has expired?
Thank you in advance for your help Tag: If there is some problem when migrate from PC to Embed chip Tag: 62893
UNINSTALLING VISUAL STUDIO.NET 2002 Pro
I am trying to Uninstall The VS.NET 2002 Pro and it tels
me <there was an error processing setup data files. Please
Contact product support if this problem persists.> i click
ok and then <A problem has been encountered while loading
the setup components. Canceling setup.> and i click again
ok and nothing happens . How can i remove it from my
computer? Tag: If there is some problem when migrate from PC to Embed chip Tag: 62892
Reference problems & custom controls disappearing
Hi all,
I really hope someone out there can help me as I've been tearing my
hair out on this one for a good while and I'm getting really
frustrated now!
My problem is this - my custom controls periodically disappear from my
project when I build it. First of I get the message about a missing
dependency, then if I rebuild after that - the control just physically
disappears from the form, and I get an object not found error when I
run, (though sometimes when I rebuild the control can reappear)
My background - I'm working in a small team of developers, we are
using vb.net in visual studio with visual source safe.
As I've said I've been battling with this for a while and have done
some reading on this - I know that it is to do with references.
Therefore I am trying to do what all the Microsoft articles I've read
recommend with regard to references: - setting copy to local = true,
using project references not file references, and setting the build
order but to no avail. (Incidentally I still get this problem when
using file references).
Some more information - the custom controls are using a data access
object, and this data access object is also being used by another
object which the main form also uses. It is the reference to this data
access object that is the one that that I get the message about the
missing dependency.
Please help - now to add insult to injury - I can not now even re-add
my custom control from the toolbox. I can put it into the toolbox but
when I try to drag it from the toolbox on to the form on nothing
happens- not even a warning message.
Many thanks
Suzanne Tag: If there is some problem when migrate from PC to Embed chip Tag: 62891
HELP - ".Net" user interface under Internet Explorer.. what to do ?
Hello all,
Once windows mmi programming was very easy - vb forms.. nice & easy.
nowdays, our customers have became IE freaks !!!
So, my question is, what is the best way to develop mmi in the ".Net"
environment, over an intranet / lan environment.
the first alternative is "Asp.Net".. though Microsoft is trying to
push it very hard, to me the idea seems to be very wrong. I think
that client code should be seperated from server code. Mixing client &
server code (without even mentioning screen refreshe issues) does not
feel right to me and my co-workers.
The second alternative is pure html code (+xml islands). I dont like
this idea... developing html in the 21 century seems a bit retro and
difficult.
My last alternative is ".Net Winforms" under IE. does anoyone has
experience with this alternative? theoreticly it seems to be a perfect
idea..
is it?
Thanks in advance,
Eran Eldor Tag: If there is some problem when migrate from PC to Embed chip Tag: 62888
When is it unsafe to use static members in your class?
Hi all,
I understand the concept of static fields and members
inside a class and the fact that static members belong to
the class rather than to an instance of the class.
I also understand that each class that calls a static
member of another class takes a copy of that member into
its own thread and therefor it's safe to call a static
member concurrency wise.
I have 3 questions though:
1. Are my above understandings correct?
2. when is it unsafe to call/use static members in a class
3. when should one use static members and when shouldn't
he?
Any info would be greatly appreciated! Tag: If there is some problem when migrate from PC to Embed chip Tag: 62886
BUG or BY DESIGN? Filehandling on .NET is not windows compatible for NTFS and FAT
Hi,
On the file handling methods, if you are dealing with files (Windows
filesystem is case INSENSITIVE) yet when you specify file A.BLAH and its
a.blah on windows, you get FileNotFoundException.
If this by design for cross platform and different file systems or a bug?
Shouldnt this be defaulting to INSENSITIVE instead of SENSITIVE on windows
NTFS (for FATxx for that matter)?
Thanks. Tag: If there is some problem when migrate from PC to Embed chip Tag: 62885
TCP/IP app Desgin Question
this is a question on how to design an TCP Listener application.
background:
There will be several threads that listen on several ports (one per port).
when another app requests to connect, the connection will be accepted. then
messages will be received and passed to the main thread via a delegate or
event for processing. Messages will also be sent in return to the other
application in an asynchronous manner.
Questions:
1) from what it seems to me, delegates are thread safe but events are not.
is this true? should i use delegates to call back to the main thread rather
than events?
2) what is a clean way to have the main thread pass a message to a listener
thread to write messages? (a reverse call back)
thanks for your help
m Tag: If there is some problem when migrate from PC to Embed chip Tag: 62882
.net framework-newbie
I'm a .Net learner.I've got few questions to ask.could
anyone please help me out?
What exactly is .Net framework ? What is .Net framework
SDK?
Is there any difference between environment and platform?
If so,what?(few examples)
What are the components of Visual studio.net?
What are the .Net web development tools?
thnaks in advance,
reiks Tag: If there is some problem when migrate from PC to Embed chip Tag: 62874
Trace Switch Issue
Hi,
I'm having a strange problem with the BooleanSwitch loaded
from a config file.
<!-- The config file -->
<configuration>
<system.diagnostics>
<switches>
<add name="switchOn" value="1" />
</switches>
<trace autoflush="false" indentsize="4">
<add name="TextListener"
type="System.Diagnostics.TextWriterTraceListener, System"
initializeData="trace.log" />
</trace>
</system.diagnostics>
</configuration>
// The code
BooleanSwitch s = new BooleanSwitch("switchOn", "bla");
Console.WriteLine(s.Enabled);
s.Enabled is always false, regardless the value in config
file. If I remove the trace element from the config file,
s.Enabled is initialized correctly according to its value.
I've tried the different permutations of full type name
for the TextWriterTraceListener:
type="System.Diagnostics.TextWriterTraceListener, System,
version=1.0.5000.0, culture=neuture,
PublicKeyToken=b77a5c561934e089"
But the result is always the same. I'm using VS.NET 2003
with .NET Framework 1.1 on Windows XP. Does anyone have
the same problem? Any solutions?
Thanks,
Donald Xie Tag: If there is some problem when migrate from PC to Embed chip Tag: 62872
.aspx page will not run
For some reason my web server does not recognize .aspx
pages. I get this error: A dynamic link library (DLL)
initialization routine failed.
It's a stand alone W2k server with IIS 5.0.
Thanks Tag: If there is some problem when migrate from PC to Embed chip Tag: 62865
Extracting .NET framework 1.1 failed
I'm trying to extract the files from the dotnetfx.exe file
with the /T:<path> and /C switches, but every time I try,
it pops up an error saying "Extracting file failed. It is
most likely caused by low memory (low disk space for
swapping file) or corrupted Cabinet file." I've downloaded
and tried it on two different PC's and I'm constantly
getting the same error.
Thanks. Tag: If there is some problem when migrate from PC to Embed chip Tag: 62863
What's my Mode?
What might be the best way to detect in code whether (C#)
system is in design mode or running? In other words, how
to tell the system if I want something to happen in a
control constructor when I am dropping the control onto a
form, but don't want it to happen when the control is
initialized in a running form.
Thanks! Tag: If there is some problem when migrate from PC to Embed chip Tag: 62861
Namespace Security
Is there any way to secure a Namespace so that it can only be accessed from
a designated Namespace? I believe there is a way but cannot locate the
exact sytax to do so.
Thanks Tag: If there is some problem when migrate from PC to Embed chip Tag: 62860
Regex - NFA, DFA, POSIX - seeking clarification
The framework help says: "Microsoft .NET Framework regular expressions incorporate the most popular features of other regular expression implementations such as those in Perl and awk. Designed to be compatible with Perl 5 regular expressions, .NET Framework regular expressions include features not yet seen in other implementations, such as right-to-left matching and on-the-fly compilation."
Perl is traditional NFA (non-POSIX), while awk (and most of its derivatives) are DFA (which are mostly POSIX anyway), so the help is a little ambiguous regarding the nature of Regex's engine
..NET's Regex doesn't (seem) to implement the POSIX longest-leftmost mandate. Jeffrey E. F. Friedl explains this mandate using the expression "(to|top)(o|polo)?(gical|o?logical)" and an input of "topological" (ignore the quotes)
A POSIX engine would be expected to return "top", "", and "ological" for the subexpressions (see Mr. Friedl's book for an explanation of why). However, .NET's Regex returns "to", "polo", and "gical"
So, is it NFA, DFA, semi-POSIX, or ...? Or, am I doing something wrong (a real possibility)
Thanks in advance for any additional info or resources you might provide Tag: If there is some problem when migrate from PC to Embed chip Tag: 62859
How to create SSL socket?
Does anyone know how to create an SSL socket using the .NET Framework?
Jon Tag: If there is some problem when migrate from PC to Embed chip Tag: 62856
Shortcut
I am development an application in C# and i want to know
this:
How can i create a new sortcut for a file having the path
of that file.
Thanks. Tag: If there is some problem when migrate from PC to Embed chip Tag: 62853
Register Primary Interop Assembley
I have a Windows Form app that uses the Windows Media Player Active-X
control. It works fine on my development machine, but on a client computer
the app crashes becuase the wmppia.dll hasn't been registered and installed
in the global assembly cache. I 've looked around and can't find a way to
automaticlly register the wmppia.dll during installation.
So as a test, I followed the instructions the do it manually on a
non-development machine that had Framework 1.1.4322 on it. I can "regasm
c:\Program Files\MyProgram\wmppia.dll" with no problem. But the Global
Assembly Cache installer; Gacutil.exe is missing. Isn't this supposed to
come with the Framwork? If not, how can I expect my end users to have it?
My question goes back to my origional thought: How can I set up my
installer to automaticlly register and install the wmppia.dll to the Global
Assembly Cache?
thanks Tag: If there is some problem when migrate from PC to Embed chip Tag: 62850
Question - >net framework 1.1 install without admin rights
Hi, is it possible to install .net framework 1.1
redistributable without administrator privileges.
Thanks .... Joe Tag: If there is some problem when migrate from PC to Embed chip Tag: 62849
File stuck open after ThreadAbortException
Hello,
I am having a problem in which a file can get stuck open when a thread
that is attempting to write to it gets aborted (ThreadAbortedException
occurs). The log file gets stuck open until the process is shut down
(cannot delete file from Windows Explorer, for example). My test
application stops execution with: An unhandled exception of type
'System.IO.IOException' occurred in mscorlib.dll Additional
information: The process cannot access the file "c:\abort_test.txt"
because it is being used by another process.
I figured I was not closing things properly, but I think I'm OK. I
created a simple test application and am still stumped. Here's my code
(added to a visual studio.net 2003 Windows application):
public static void ThreadProc()
{
// Just keep writing to the log file until thread gets aborted
for (; true;)
{
try
{
using ( FileStream fs = File.Open(@"c:\abort_test.txt",
FileMode.Append,FileAccess.Write))
{
using (StreamWriter sw = new StreamWriter(fs))
{
sw.WriteLine(DateTime.Now.ToString()+" A line of text");
}
}
}
catch (ThreadAbortException e)
{
using ( FileStream fs = File.Open(@"c:\abort_test2.txt",
FileMode.Append,FileAccess.Write))
{
using (StreamWriter sw = new StreamWriter(fs))
{
sw.WriteLine(DateTime.Now.ToString()+ e.Message + "--" +
e.StackTrace);
}
}
}
Thread.Sleep(0);
}
}
private void Form1_Load(object sender, System.EventArgs e)
{
// Sometimes code aborts in non-harmful places, so loop enough
times to almost guarantee a problem
for (int i = 0; i < 10; i++)
{
Thread t = new Thread(new ThreadStart(ThreadProc));
t.Start();
Thread.Sleep(1000);
t.Abort();
t.Join();
}
}
Here's the contents from my c:\abort_test2.txt:
11/14/2003 3:43:02 PMThread was being aborted.-- at
Microsoft.Win32.Win32Native.CreateFile(String lpFileName, Int32
dwDesiredAccess, FileShare dwShareMode, SECURITY_ATTRIBUTES
securityAttrs, FileMode dwCreationDisposition, Int32
dwFlagsAndAttributes, IntPtr hTemplateFile)
at Microsoft.Win32.Win32Native.UnsafeCreateFile(String lpFileName,
Int32 dwDesiredAccess, FileShare dwShareMode, SECURITY_ATTRIBUTES
securityAttrs, FileMode dwCreationDisposition, Int32
dwFlagsAndAttributes, IntPtr hTemplateFile)
at System.IO.FileStream..ctor(String path, FileMode mode,
FileAccess access, FileShare share, Int32 bufferSize, Boolean
useAsync, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode,
FileAccess access, FileShare share)
at System.IO.File.Open(String path, FileMode mode, FileAccess
access, FileShare share)
at System.IO.File.Open(String path, FileMode mode, FileAccess
access)
at TestFileAbortProblem.Form1.ThreadProc() in
c:\programs\dotnet\testing\testfileabortproblem\testfileabortproblem\form1.cs:line
98
Any ideas on how I can make sure the file gets closed or how I can
prevent the ThreadAbortException exception from being thrown during
file manipulation?
Thanks in advance,
Mark Tag: If there is some problem when migrate from PC to Embed chip Tag: 62847
Unhandled Exception handler
I'm trying to install an UnhandledException handler in a Console
application. I have done the following as the first few lines of code in
Main:
AppDomain currentDomain = AppDomain.CurrentDomain;
currentDomain.UnhandledException += new
UnhandledExceptionEventHandler(HandleTheException);
Then my handler is defined:
public static void HandleTheException ( object sender,
UnhandledExceptionEventArgs e )
{
Console.WriteLine ( "Exception: {0}",
(Exception)e.ExceptionObject).Message );
Console.ReadLine ( );
}
When an UnhandledException is thrown and I have the JIT debbugging options
all UN checked I still get a dialog that has "Common Language Runtime
Debugging Services" in the title bar and a message saying that the
application has generated an exception that could not be handled. Click OK
to terminate that application or Click CANCEL to debug the application. If
I click OK then my handler gets invoked.
Is there any way to disable this dialog box? I just want my handler to do
all the work with no other dialogs.
Thanks
Ken Tag: If there is some problem when migrate from PC to Embed chip Tag: 62845
Question about framework 1.1
Does anyone know if and where we can check the source
code for the .net framework 1.1 class library? Just like
the MFC class library?
Thanks.
Roy Tag: If there is some problem when migrate from PC to Embed chip Tag: 62832
Question
Does anyone know if and where we can check the source
code for the .net frame class library? Just like the MFC
class library?
Thanks.
Roy Tag: If there is some problem when migrate from PC to Embed chip Tag: 62831