Handling the message pump for a UserControl

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  - 1
    - Play video formats inside a vb.net application I am curious about ways to play a vido inside a vb.net application. Are there controls for this purpose or some classes in Net which allow this. I am not talking about creating a video, just something that can take the file and play it inside my application. Thanks, Fred Herring Tag: Handling the message pump for a UserControl Tag: 84247
  - 2
    - SQL Query - Ok its from a windows app I think I need a nested query but here's the problem. I promise i've exerted my meager brain power on this problem & ask this as a last resot! 3 Tables PatientTable PatActive, PatID ProfileTable PatID, CodeID, OtherInfo, MedicineID MedicineTable MedicineID MedicineInfo I need a return from Table2 Info including the detailed child data from Table3 [OtherInfo] where patient is active, however i only want rows from Profile table where the element CodeID is MAX for each patient. subquery is fine SELECT MAX(ProfileTab.CodeID) AS CodeID , patienttable.patsurname FROM (profileTable INNER JOIN patienttable ON profiletable.PatID= patienttable.PatID) GROUP BY patienttable.patsurname HAVING (patienttable.patactive = 1) I had to add the Group by statement when I tried to add this into another query. I dont have direct access to the DB so cannot use stored queries. *** Sent via Developersdex http://www.developersdex.com *** Don't just participate in USENET...get rewarded for it! Tag: Handling the message pump for a UserControl Tag: 84240
  - 3
    - TreeView control; checkboxes for only few nodes, is it possible ? Hi! I am trying to create checkboxes for some nodes of my TreeView control and not for the other. I can not see anything on the Nodes level. I can only set the checkboxes = true on the top parent level. Is it possible to do with MS TreeView control that ships with VS.NET 2003 ? Is there anything on the market that can help me ? Many Thanks in Advance, --Mike Tag: Handling the message pump for a UserControl Tag: 84238
  - 4
    - How to pass an EventArgs to OnClick upon clicking a control Hi all, When you click a control, OnClick is called which in turn calls the Click event. OnClick takes as an argument an object of type EventArgs which it then passes to Click. However, the default behavior is that the EventArgs that is sent is an empty one. I want to pass in some values in my EventArgs when the user clicks my control. How do I do this? Thanks, Nima Tag: Handling the message pump for a UserControl Tag: 84235
  - 5
    - MessageLoop on a thread Is there a way to add a Windows MessageLoop to an existing thread? I have a .NET application that is called from from a COBOL app using COM, and when I show a form, the System.Windows.Forms.Application.MessageLoop is set to false. Is there some way to ensure that the form displayed has a MessageLoop? I have tried displaying the form several ways (described below), but all of them seem to have some problem that makes it a less then ideal solution. Showing the form this way: System.Windows.Forms.Application.Run(_child); Worked great, except that the user couldn't get back to COBOL application that launched the .NET form - and we needed to be able to do that. So I tried this: ShowFormDelegate formshow = new ShowFormDelegate(ShowFormMessageLoop); this.AppContext.CurrentWorkbench.Form.Invoke(formshow, new object[] {_child}); Where ShowFormMessageLoop is: private void ShowFormMessageLoop(Form frm) { frm.Show(); } (Where this.AppContext.CurrentWorkbench.Form is a form that is not visible, in fact it's never visible, it's just created in the background. ) But this does not have a MessageLoop, so Tabs, ESC, function keys, etc. are not processed at all on the form. This method came the closest to working correctly, except that some of the 3rd party controls (grids and toolbars) that were on the forms would not process keystrokes correctly - the controls are apparently implementing a message filter that is not getting processed. _applicationcontext = new System.Windows.Forms.ApplicationContext(_child); ThreadStart _threadstart = new ThreadStart(this.StartMessageLoop); Thread _thread = new Thread(_threadstart); _thread.IsBackground = true; _thread.ApartmentState = ApartmentState.STA; _thread.Start(); Where StartMessageLoop is: private void StartMessageLoop() { System.Windows.Forms.Application.Run(_applicationcontext); } If anyone has any ideas, I would greatly appreciate it. Thanks! Theresa Tag: Handling the message pump for a UserControl Tag: 84220
  - 6
    - Invalidate but do not draw background I work on a data acquisition system. I need to display data as it comes. There are two different modes: 1. Display only current set of data each time it is ready. 2. Display the current data, but don't erase the previous one. I remember in MFC I was able to do this by changing one parameter (DrawBackground() or something like that). I am trying to do it with C# and failing. If I use Invalidate() or Invalidate(rect) functions, than the previous data is erased. However if I just use my plotting functions directly to display the data, then I need to create Graphics (this.CreateGraphics) and pass it to the plotting routine. But then the program crashes some time when I try to resize the window for example. It tells me that a Brush (or Color, etc...) is used somewhere. I think it is because I have two requests for plotting data with two different Graphics: one is coming from acquisition board when the data is ready, and the other - from Windows when I resize the window. Is there any way to use Invalidate() but somehow specify not to erase the background? This would solve all the problems as I did not have to create another Graphics and just use the one that is generated by .NET in the Paint message. Thank you in advance, Viktor Tag: Handling the message pump for a UserControl Tag: 84219
  - 7
    - IE Download Capture Hello peeps, Does anyone know how to hook into the IE download like gozilla does? Tag: Handling the message pump for a UserControl Tag: 84215
  - 8
    - Help: I can't view a WinForm in [Design] mode Hi, I'm using Visual Studio.Net 2002 and I can no longer open my windows forms in Design mode. In the Solution Explorer, I see the white "VB" icons instead of the grey "Form" icons. I already tried rebuilding the whole solution and made sure and all of the references are correct but it still doesn't work. Any other ideas? Thanks in advance! Tag: Handling the message pump for a UserControl Tag: 84212
  - 9
    - Highlighted Text I've created a Dialog box with textbox to display messages to the user of the program. Whenever I write text to the text box it always comes out highlighted. I can't seem to figure out how to de-highlight the text within the textbox. Anyone have any idea how to do this? Thanks Marv From http://www.developmentnow.com/g/29_2005_1_0_0_0/dotnet_framework_windowsforms.htm Posted via DevelopmentNow Groups www.developmentnow.com/g www.developmentnow.com Tag: Handling the message pump for a UserControl Tag: 84208
  - 10
    - WindowsForm freezes on second launch I have a WindowsForm application that I developed on my XP workstation. It is a nulti-threaded socket application that sends and receives messages. On my workstation I can close and restart the application normally with no ill effects. Now when I put the application on a Windows 2000 Server it runs perfectly fine the first time around. However, when I close the application and try to restart it the second time it won't show the UI, minimizes itself to the taskbar and Task Manager shows it as Not Responding. Is this a Framework issue? XP vs 2000? Any ideas where to start? Thanks Bigreddog Tag: Handling the message pump for a UserControl Tag: 84194
  - 11
    - Async windows programming Three quick (I hope) questions regarding async programming in a windows form: 1) When I perform a BeginInvoke on a delegate in my own thread (actually the main GUI thread) in the midst of a message event handler (say OnMouseUp), does the implementation basically work the same as the BeginInvoke from another thread, i.e., a message is posted, the event handler completes execution, then when the message is dequeued, the target method is invoked? 2) Is there a complete list of how synchronous paint calls can be generated? I know that doing an Invalidate() simply queues a paint message, but adding an Update() causes a synchronous paint message. If my handler for the async event absolutely needs to know that OnPaint(0 is not entered while it is doing it's work, what else could it do incorrectly, (besides calling Update()) that could cause a synchronous OnPaint() 3) Are any other calls to handlers made synchronously (like mouse moves or mouse up/down, etc)? -- Mark Stega Tag: Handling the message pump for a UserControl Tag: 84193
  - 12
    - Reversing text in TreeView nodes I haven't received an answer to my question of a few days ago regarding a flipped treeview control posted in the dotnet.framework.windowsforms.control newsgroup, so I thought I'd ask it again. Sorry about the cross-posting, but I'm getting desperate as the drop-dead date, the 25th of this month, on my project approaches. I'm attempting to create a TreeView similar to the one on the right-hand side of the BizTalk Mapper screen. I'm able to create a mirror image of a normal TreeView with everything swapped left-for-right, kind of like looking at the reflection of the tree in a mirror; unfortunately, that everything also includes the text for each node. Is there a way of creating a bitmap of each visible node and performing a Bitmap.RotateFlip(RotateFlipType.RotateNoneFlipX) on it prior to performing a Bitmap.RotateFlip(RotateFlipType.RotateNoneFlipX) on the bitmap of the entire tree? Is there another way of accomplishing the same thing? Any help would be greatly appreciated. Tag: Handling the message pump for a UserControl Tag: 84190
  - 13
    - Reading Text datatype into a byte Array Hi, I am populating a records fetched from a select query in OleDbDataReader. The datbase is MS Access, The datatype of the select query column is Text. I want to read the data as Byte array instead of string as Reading it into a string causes it to be converted to Unicode which is do not want. Anybody is aware of some sites from where i can get valuable information or some sample project please do let me know about it. Any information provided will be greatly appreciated. Thanks in advance, Debu Tag: Handling the message pump for a UserControl Tag: 84188
  - 14
    - Show Help and Minimise and Exit Hello. It seems that in order to get the help (?) button to show in the top right of a form, the minimum and maximum properties need to set to false. I would like to have a help, minimise and exit button on my form. Is there any way to do this? Many thanks for your assistance. Tag: Handling the message pump for a UserControl Tag: 84186
  - 15
    - Drag Drop using Menus Hi, I have a sitiuation in which I need to initiate a drag operation on a grid based on a menu click or button click. For example, the user right clicks on the grid and a context menu is shown. One of the menu's is called "Move". If the user clicks on the Move menu item, the grid should initiate the drag procedure. I call the Grid.DoDragDrop(...) on the click of the menu, but as "Click" means mouse down and then mouse up, the drag operation gets "cancelled" and immediately after the call to Grid.DoDragDrop(), the Grid's DragDrop event is called - meaning that the Drag operation is over. Is this any intutive way to accomplish this i.e. initiate Drag from a menu? Tag: Handling the message pump for a UserControl Tag: 84181
  - 16
    - restart application How to write windows application in VB.NET , which on getting the error should restart Tag: Handling the message pump for a UserControl Tag: 84178
  - 17
    - GDI+ encoder CLSIDs and image resampling Hi folks Hope this isn't OT here. I got no joy in microsoft.public.win32.programmer.gdi. (1) I'm using GDI+ to save an image in various standard (built-in) formats: JPEG, GIF, BMP etc. I currently have the encoder CLSIDs hardcoded. Is that safe, or should I iterate the encoders at runtime, looking for one with the relevant MIME type? (2) I'm using GdipGetImageThumbnail() to resample images smaller *or larger*. I've tried altering the interpolation mode to see if that makes any difference. It doesn't seem to. Here's what I'm doing: GdipGetImageGraphicsContext lOldBitmap, graphics GdipSetInterpolationMode graphics, <mode> GdipGetImageThumbnail lOldBitmap, W, H, lNewBitmap - Is GdipGetImageThumbnail() appropriate for resampling images larger, or is there a better way? - Should it use the interpolation mode that I have tried to set above? - Why does changing the interpolation mode, require a graphics context? Resampling is just a mathematical operation on the bitmap content. What does the graphics context contribute? TIA, TC Tag: Handling the message pump for a UserControl Tag: 84171
  - 18
    - GDI+ encoder CLSIDs, and image resampling Hi folks Sorry if this is OT, but I got no joy in microsoft.public.win32.programmer/gdi. (1) I'm encoding to standard (built-in) formats: JPEG, BMP, GIF etc. I currently have the encoder CLSIDs hardcoded. Is that safe, or should I iterate the encoders at runtime, looking for ones with the relevant MIME types? (2) I'm using GdipGetImageThumbnail() to resample images smaller *or larger*. I've tried altering the interpolation mode to see if that makes any difference. It doesn't seem to. Here's what I'm doing: GdipGetImageGraphicsContext lOldBitmap, graphics GdipSetInterpolationMode graphics, <mode> GdipGetImageThumbnail lOldBitmap, W, H, lNewBitmap - Is GdipGetImageThumbnail() appropriate for resampling images larger, or is there a better way? - Should it use the interpolation mode that I have tried to set above? - Why does changing the interpolation mode, require a graphics context? Resampling is just a mathematical operation on the bitmap content. What does the graphics context contribute? TIA, TC Tag: Handling the message pump for a UserControl Tag: 84170
  - 19
    - Microsoft: Help with OLE documents... Hi all. I have an application to draw and design different documents, that supports linking and embedding of other documents (like, for instance, Corel Draw or Word). Then, the user can print their designs "WYSIWYG", so I load the external document inside an OLE document container control (VB6), get a handle to the object and invoke OleDraw with the hDC that I want the object in. This have been working excellent, and this application is largely distributed among our clients. The problem is we want to migrate to .NET (any language, VB, C#, C++, ...), but there's no OLE container that lets me obtain a handle to an OLE document. I know you could import COM and ActiveX, but this particular control (included in VB6) CANNOT BE IMPORTED NOR INSERTED in .Net. Microsoft calls this a "migration issue" and warns us about it, but how, then, can I draw an Ole document inside our application (let alone open, edit, update, etc)? Is Microsoft planning to update this component for VS.Net 2005? Or is there an alternative? I know I could load an OLE document "the hard way", but those are methods so obscure, I get lost before even starting to insert the document in a container... If this is the only solution, is there an easy (as easy as this can be) example that can lead me to accomplish the insertion of a document inside mine? I know it can be done, because RTF editor lets you do it. It even lets you open and edit the document, and "paste special", but I don't seem to accomplish getting a handle to any of those inserted objects... Thank you for your time, VBen. Tag: Handling the message pump for a UserControl Tag: 84169
  - 20
    - memory leak in Timer controls, and thread sleep Hi, We have find memory leaks when we tried to use timer to raise event at specified interval. The OS we use is: Windows XP Professional Version 2002, service Pack 2, IDE is: Visual Studio .NET2003. Microsoft .NET Framework 1.1, version 1.1.4322 SP1. To repeat this problem, 1. creat a VB windows solution 2. on the form, add a timer control, set the property interval to 100 3. add a button, name it "start" 4. add an event handler( command_click) to the button "start" 5. in the event handler, start the timer 6. watch in the "task manager", memory is prograssively increase, 7. to make this problem more clear, add another timer, set the interval to 10, again, when the button "start" clicks, start both the timer. this time you probably will notice the memory leaking faster, in 10 minutes, you will find it is leaking around 1MB. I tried to change the timer control to System.timers.timer, and use call back functions at the specified interval, I have the same problem. Further investigation into the memory leaking, we found if you put the thread into sleep at certain amount of time, the memory leaks as well. Is ther any one who knows why? This memory leak crashes our application. I tried to force garbage colletion, things getting even worse. Any suggestions are welcome. Lihui Tag: Handling the message pump for a UserControl Tag: 84165
  - 21
    - Resize a form based on content size Is it possible to resize a form based on the size of its contents? In VB6- we had ScaleWidth & ScaleHeight properties, with which one could get/set the form size to fit exactly. Is there an analog in the .NET Framework? Thanks! -Evan Tag: Handling the message pump for a UserControl Tag: 84163
  - 22
    - Treeview scroll problem I have a treeview control on a form with Scrollable=True. If a user scrolls the list and then selects a node, the selected node returned by the AfterSelect event is always the topmost visible node in the list, not the node selected. This also happens for the click event, but double-click works ok. Can someone suggest a workaround for this behaviour? Tag: Handling the message pump for a UserControl Tag: 84162
  - 23
    - My Brain Hurts _ One last undetermined error I have an application based on the Issuevision example at MSDN. The program falls over at this line: Application.run(New MainForm) Call Stack// 'DefaultDomain': Loaded 'c:\windows\microsoft.net\framework\v1.1.4322\mscorlib.dll', No symbols loaded. 'RevMed': Loaded 'C:\Sandbox\MedOOP2\bin\RevMed.exe', Symbols loaded. 'RevMed.exe': Loaded 'c:\windows\assembly\gac\system.windows.forms\1.0.5000.0__b77a5c561934e089\system.windows.forms.dll', No symbols loaded. 'RevMed.exe': Loaded 'c:\windows\assembly\gac\system\1.0.5000.0__b77a5c561934e089\system.dll', No symbols loaded. 'RevMed.exe': Loaded 'c:\windows\assembly\gac\system.drawing\1.0.5000.0__b03f5f7f11d50a3a\system.drawing.dll', No symbols loaded. 'RevMed.exe': Loaded 'c:\windows\assembly\gac\system.data\1.0.5000.0__b77a5c561934e089\system.data.dll', No symbols loaded. 'RevMed.exe': Loaded 'c:\windows\assembly\gac\microsoft.visualbasic\7.0.5000.0__b03f5f7f11d50a3a\microsoft.visualbasic.dll', No symbols loaded. 'RevMed.exe': Loaded 'c:\windows\assembly\gac\system.xml\1.0.5000.0__b77a5c561934e089\system.xml.dll', No symbols loaded. 'RevMed.exe': Loaded 'c:\sandbox\medoop2\bin\threadhelper.dll', No symbols loaded. An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in system.windows.forms.dll Additional information: Specified argument was out of the range of valid values. Help greatly appreciated Tag: Handling the message pump for a UserControl Tag: 84159
  - 24
    - Synchronizing 2 grids via the CurrencyManager I have written a custom databound grid control that we've been using successfully for months, but one of our developers has just run into a problem that I can't figure out. The code for setting it up is as follows: DataSet dataSet = new DataSet( "TestSet" ); DataTable tableParent = dataSet.Tables.Add( "TableParent" ); tableParent.Columns.Add( "ID", typeof( Int32 ) ); tableParent.Columns[ "ID" ].AutoIncrement = true; tableParent.Columns[ "ID" ].Unique = true; tableParent.Columns.Add( "Col1", typeof(Int32) ); tableParent.Columns.Add( "Col2", typeof(Int32) ); DataTable tableChild = dataSet.Tables.Add( "TableChild" ); tableChild.Columns.Add( "ID", typeof( Int32 ) ); tableChild.Columns.Add( "Col1", typeof(Int32) ); tableChild.Columns.Add( "Col2", typeof(Int32) ); dataSet.Relations.Add( "Child2Parent", tableParent.Columns[ "ID" ], tableChild.Columns[ "ID" ] ).Nested = true; gridParent.DataSource = dataSet; gridParent.DataMember = "TableParent"; gridChild.DataSource = dataSet; gridChild.DataMember = "TableParent.Child2Parent"; The way it is supposed to work (and does work with the MS DataGrid) is that when you select a row in the parent table, it should set the data in the child table to all children of the selected parent. In my grid, when the current cell changes, I set the position in the CurrencyManager to the new position. My understanding (and apparently a false one) was that the CurrencyManager would update the position in the underlying dataset which in turn would then inform all CurrencyManagers bound to it. Apparently that's not the case. The parent grid receives the CurrencyManager.PositionChanged event but the child grid receives no events from its CurrencyManager. How am I supposed to propagate an update to the child grid? Thanks. Pete Tag: Handling the message pump for a UserControl Tag: 84157
  - 25
    - ListView & Copying of Hi, I have a windows form, in C#. It has a ListView on it. For a couple of reasons I now need to be have multiple sets of Data that can be dynamically Copied into and out of the ListView. But I'm having realy trouble with it....and feeling pretty frustrated. I firstly tried copying over listView.Items - which is ok to read out of, but its a read only property and can be copied back over. Also tried listView.Items.CopyTo (lviArray) and tried a listView2.Items.AddRange (lviArray), but I get an exception about data already existing else where either remove it first or clone it. Tried cloning it but that doesn't seem to work either. Feel I am missing something. Any help would be appreciated. Thanks, Laura Tag: Handling the message pump for a UserControl Tag: 84155
- Next
  - 1
    - Drag and Drop question I am writting an application (app A) where the users can drag some text within my application and drop it in another application (app B). When the item is dropped, the app A must know that an it was successfully dropped in app B and do further processing. How can this be done? Thanks. Tag: Handling the message pump for a UserControl Tag: 84154
  - 2
    - Program PowerPoint using C# I am trying to locate some examples or some instructions on how to program the PowerPoint object model using C# in a Windows Forms or ASP.NET application. -- Charlie Jursch Patotech Software, Inc. Danville, CA Tag: Handling the message pump for a UserControl Tag: 84152
  - 3
    - Controls Disapear when I Compile Windows Forms I have come across a strange BUG in VS 2003 that drives me nuts and makes working in the Windows Form designer sometime impossible. This usually happens when I have made a lot of changes to a form by deleting then re-adding a bunch of controls. The problem happens when I try to re-add controls. I can add the controls and get them all exactly where I what, and the form looks good then I compile the project/solution and then everything goes bad. I get strange errors like: "Duplicate declaration of member 'location'" or just "Member Not Found". When you double click on them all it does is take you to the top of the class. When you look at the form generated code you can tell that most of the properties to tell the control where to display and its size are missing, so when you look at your form all your controls are gone in design mode. I end up having to go into the code and deleting the declarations manually and removing all the code in that was generated by the designer. I have looked at the KB article 821309 that is for the problem with 'location', but that says it is only a problem in 2002 and the workaround didn't work for me anyway. Right now I have one form that I can do this on pretty much every time I add a control. I can add one control get it like I want then I save it and check it in. Then I check it out make more changes. I keep checking in and out so if I make to many changes and everything gets screwed up I don't have to redo everything again. We use Vault 3.0 for our source control and this isn't a Vault problem because I had this issues with Visual Source Safe also. Any help on this problem would be great. I have tried deleting the RESX file for the form, but that doesn't help either. Thanks, Eric Renken Tag: Handling the message pump for a UserControl Tag: 84150
  - 4
    - Hierarchical presentation style for DataGrid I have bound datagrid to a dataset with a datarelation defined between work orders and line items of those work orders. The default navigation style is to present the [+] at each work order. You expand, and it shows the name of the datarelation in a new line, that is shown as a hyperlink. You must THEN click the hyperlink and then it clears the data grid display, shows the parent work order data at the top, and then a grid of columns for the line item. I have seen grids show subordinate records on the same "page" as their master records, with column headings for the expanded area appropriate for the line items. How is this done? Tag: Handling the message pump for a UserControl Tag: 84149
  - 5
    - Unhandled exception after calling child form's Dispose(). Hello, I have a main form (MainForm) which contains File->New menu item. On clicking File->New menu item, i am displaying a form (ChildForm) which contains a lot of controls and a lot of complex code. Everytime the File->New menu item is clicked, a new instance of ChildForm is created and shown as modal dialog with MainForm as owner. In the ChildForm's Dispose() method, i have included code to remove all event handlers, cleanup the controls etc. After call to ChildForm.ShowDialog(MainForm), i am calling the ChildForm.Dispose() method explicitly, to release the window handles. The problem here is I am getting an Unhandled Exception saying "System.NullReferenceException: Object reference not set to an instance of an object. at System.Windows.Forms.ChildWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)". Please help me! Thanks, VijayakrishNa P. Tag: Handling the message pump for a UserControl Tag: 84136
  - 6
    - Chart control for Windows Forms hi, Looking for a reliable-easy to use Chart control. never used one before, so any advice / experience is greatly appreciated. Tag: Handling the message pump for a UserControl Tag: 84129
  - 7
    - Launch WebBrowser How can I launch a webbrowser from my windows forms applications? The reason I need that is because I have a DataGridView with links in one of the columns. When clicking on it I process the click and then want to start a webbrowser loading the site that the link was pointing to. Thanks, Rob Tag: Handling the message pump for a UserControl Tag: 84124
  - 8
    - Event on record change I have some controls on my form which are bound to a dataset and some which are not bound. But whatever record is displayed on the form, I want to populate those control (datetime, combo, etc.) with the data in the current record. What event can I do this in ? PositionChanged of bindingContext - is this called before the record is current or after ? if it is after, I can use this. Please advise. HS Tag: Handling the message pump for a UserControl Tag: 84122
  - 9
    - Bypass IE Print Dialog Hi, I am using ShellExecute() to print HTML files through Internet Explorer (to defalut printer). But I don't know how to bypass the Print Dialog. Any help/advise will be appreciated. Thanks in advance! DGU *** Sent via Developersdex http://www.developersdex.com *** Don't just participate in USENET...get rewarded for it! Tag: Handling the message pump for a UserControl Tag: 84118
  - 10
    - How to refresh SOME records in the datagrid but NOT SQL Server ? I am sure this is a dumb/simple question, but I am new to this stuff, so request for patience with me... I have OUTSIDE knowledge that there is activity regarding some records in a parent / child set of tables I am showing in what I want to be a read-only view in a grid. I have primary key values, but don't know if it is just a change to existing records, or if the record was recently inserted. I want to reflect these changes to the grid in realtime as they occur, by using the primary key to query certain records and get them updated in the datagrid. I started out binding the grid to a DataTable. But I had trouble detecting column sorts, and the need to show some status information for the current cell. I switched to using a DataView and that fixed that. Then I wanted to show work-order/line-item levels, and so I created a datarelation in a dataset, and bound to that, and this works (pretty good). I thought if I queried JUST the work order and line items I know have changed, this would be very efficient. I just need to integrate those data updates to grid. From docs it appeared that DataTable.LoadDataRow would allow me to import the values from the update query data set, and would then update my grid with additions and row value changes. But I get duplicate primary key errors, which suggests to me this is trying to update the database, rather than just my in-memory dataset and the display grid. This makes me wonder if I in any way change the dataset if it will be attempting to post those to the database underneath, which I do not want. Am I going to have to implement my own list structure to bind to the grid? If not, how is this done with datasets? Tag: Handling the message pump for a UserControl Tag: 84115
  - 11
    - BUG in Combobox.Location ? Hi, I want to draw combobox to bottom of form. I have following code : ComboBox C = new ComboBox(); C.Font=FontNormal; Size CSize=C.Size; C.Location = new Point(0,this.Height - CSize.Height); // this.Height is Height of parent control this.Controls.Add(C); By me it is correct but down part of my combobox is drawn out of control. Why ? Thank you Tag: Handling the message pump for a UserControl Tag: 84113
  - 12
    - SelectedIndexChanged event with listview I have a form with a listview to allow users to select an item. When they select one I fill in controls below it for them to modify the values. They can also just enter new values in the controls without selecting a listview item in order to insert new records. After entering new data if they select a row in the listview I prompt them to make sure they want to save the changes. If they select 'Cancel' I want to not highlight the newly selected row and leave the data in the detail controls as it was. Otherwise the new row is selected and the listview item is used to populate the detail controls. The problem seems to be that when I clear the selected items for the listview the selectedindexchanged event fires again. I get the yesnocancel prompt twice. If I step through the code in the debugger I only get it once. I tried using a bool to skip the handler when clearing the selection but it seems like the highlighting of the selected row then sometimes happens after the clearing so it ends up in the selected anyway. I tried playing with the clicked event and others and the events don't seem to always happen in a predictable order. Each thing I try seems to create new issues and it seems this shouldn't be this difficult. I've done similar things with the datagrid but would like to use listview. Basically want to be able to prompt the user sometimes when they select a new listview item and if they "cancel" I want to be able to clear the selection or set the selected item to a prior selected item without prompting them a second time. Any help would be appreciated. Thanks in advance. Jeff Tag: Handling the message pump for a UserControl Tag: 84112
  - 13
    - Databinding to Textboxes I have a windows forms that shows only one record at a time. The user selects the record he want via a combo box. Everything works fine for the first selection, however the textboxes do not automatically update their values when the combo box changes values. The textboxes are bound to a dataset. Here is and an example of what the databinding lookes like in designer: Text: DsEventPerson1 - tblSubject.FirstName When the user selects a new row in the combo box, the DsEventPerson1 is cleared and refilled. What must I do to get the textboxes to show the correct values for each record selected? -- wr Tag: Handling the message pump for a UserControl Tag: 84109
  - 14
    - Newbie question Hi, How I can get size of Graphics.DrawString in pixel ? Becuase after I draw string I need place after its combobox ... Thank you. Tag: Handling the message pump for a UserControl Tag: 84108
  - 15
    - change header text In my header on my grid i need to make the text dynamic, first is that possible and how can it be done? Tag: Handling the message pump for a UserControl Tag: 84106
  - 16
    - change header text In my header on my grid i need to make the text dynamic, first is that possible and how can it be done? Tag: Handling the message pump for a UserControl Tag: 84105
  - 17
    - Need to disable "Print progress" popup dialog have an app that does batch printing. The Dialog telling me which page is being printed keeps poping up. It's very annoying!! Any way to disable it?? Thanks in advance. Tag: Handling the message pump for a UserControl Tag: 84103
  - 18
    - Control Validating Event Odd Behavior I now know this event is quirky. I am seeing something odd, *though*. When I set a break point inside a validating Event Handler, I see the desired behavior when setting cancel = True. "If the test fails, you set the Cancel property of the Validating event's CancelEventArgs to True. This cancels the Validating event and causes the focus to return to the control. The practical effect is that the user cannot leave the control until the data is valid." However, when not running in debug mode I do not see the desired behavior when cancel = True. I am able to leave the control even though the data is not valid. Make sense to anyone? Greg Robinson Custom Data Systems, Inc. www.cds-am.net Tag: Handling the message pump for a UserControl Tag: 84102
  - 19
    - Calling .NET using COM I have a C# Windows Application that was built using an XML-based framework (It's fairly complex, but simplifies our development considerably.) We have recently integrated this application with a COBOL application, in that the COBOL application will call our .NET forms. I have discovered a few issues with this, and hope someone may be able to help in fixing them. Most of the problems seem to revolve around the Windows MessageLoop, threading and some third-party components (namely, Janus GridEx and Infragistics Toolbars). (I posted to their news forums, but have not had any luck there.) I think the problem may be more in how I am creating and using the thread. I have the code here that is used when a form is called from the COBOL application. One thing I have noticed is that if I call the form using System.Windows.Forms.Application.Run(_child) , the form works perfectly, but the user cannot do anything in the COBOL application - it's "frozen" until I close the .NET form. If I use the following code to call the form, the user can do stuff in the COBOL application, but the Tab, ESC, Alt, etc. keys do not function as expected on the third-party components, which may do something of their own with the keys. For example, the Janus Grid should Tab from column to column, but does not. Instead, it will tab from control to control. I have tried looking at various properties of the thread the form is on, the ApplicationContext, the Application, etc, but nothing seems to be different from one call to the next, except for the thread's ID. Any help would be greatly appreciated!! The code to create the thread is: _applicationcontext = new System.Windows.Forms.ApplicationContext(_child); ThreadStart _threadstart = new ThreadStart(this.StartMessageLoop); Thread _thread = new Thread(_threadstart); _thread.IsBackground = true; _thread.ApartmentState = ApartmentState.STA; _thread.Start(); Where _child is the form with the grid, and StartMessageLoop is: private void StartMessageLoop(){ Application.Run(_applicationcontext); } Tag: Handling the message pump for a UserControl Tag: 84100
  - 20
    - Winform with DirectX Video-Directshow Use I need to grab a video frame on a winforms app. The Microsoft oldway was with Direct Show filter as detailed in Microsoft DirectX 9.0 SDK Update (October 2004) GrabBitmaps Sample This C++ console application shows how to use the Sample Grabber filter to capture frames from a video file. What is the new way/right way to do this now? Am I suppose to use managed direct-x which supports the directshow filter? I need to do this in CSharp so are there special using statements that I need to access the direct show features of managed direct-x. Help anyone I am so confused about this. Thanks Tag: Handling the message pump for a UserControl Tag: 84098
  - 21
    - Problem with Opacity and Clipping on a textbox I have a derived textbox which draws an XP border around the control by catching the WM_NCPAINT message. The control works fine until the Opacity of the form is set to something other than 0. Setting the opacity to anything other than 1 causes all sorts of problems. For example, the DC returned by GetWindowDC is not aligned with the actual location of the window so the window is drawn in an incorrect location (it's offest by the width and height of the NC border), the drawing area in the DC is the wrong size so I cannot paint the entire NC area, the client area is not correctly positioned and the mouse hit testing is incorrect. In general things are a mess when opacity is set to anything other than 1. Any thoughts or comments? andrew using System; using System.Drawing; using System.Windows.Forms; using System.Runtime.InteropServices; using Barcap.GSL.Windows.Forms.Utils; namespace XpWindows.Forms.Controls { /// <summary> /// Represents a Windows XP style capable TextBox control. Displays in XP style if the /// AppController.Current.FormProperties.XPThemeStyle is set to other than "None". /// </summary> [ToolboxBitmap(typeof(XPTextBox),"Resources.XPTextBox.bmp")] public class XPTextBox : System.Windows.Forms.TextBox { #region Private Variables private bool _enableXPStyles = (AppController.Current.FormProperties.XPThemeStyle != XPThemeStyle.None); #endregion Private Variables #region Constructor /// <summary> /// Initializes a new instance of the XPTextBox class. /// </summary> public XPTextBox() : base() { } #endregion Constructor #region Protected Methods /// <summary> /// Expose whether XP styles should be used for rendering this control (derived from the app controller). /// </summary> protected bool EnableXPStyles { get { return _enableXPStyles; } } /// <summary> /// Override the paint message if XP styles are enabled. /// </summary> /// <param name="m">Windows message</param> protected override void WndProc(ref Message m) { const int WM_NCPAINT = 0x0085; // Base class implementation has to be called no matter what // because the scroll bars of multiline textboxes are drawn // in WM_NCPAINT base.WndProc(ref m); if ( _enableXPStyles ) { if (m.Msg == WM_NCPAINT) { using(Graphics gr = Graphics.FromHdc(Win32UI.GetWindowDC(this.Handle))) { // Draws a blue border around the textbox _DrawBorder(gr, 0, 0, this.Width - 1, this.Height - 1); // Draws over the textbox border using the textbox backcolor _DrawInnerBorder(gr); } } } } #endregion Protected Methods #region Private Methods /// <summary> /// Draw a rectangle border. /// </summary> /// <param name="g">The System.Drawing.Graphics object to be used to draw the rectangle.</param> /// <param name="x"></param> /// <param name="y"></param> /// <param name="width"></param> /// <param name="height"></param> private void _DrawBorder(Graphics g, int x, int y, int width, int height) { g.DrawRectangle(new Pen(XpBorderColor, 0), x, y, width, height); } /// <summary> /// Draws the inner border of the textbox control if XP style is enabled. /// </summary> /// <param name="g">The System.Drawing.Graphics object to be used to paint the inner border of the control.</param> private void _DrawInnerBorder(Graphics g) { using (Pen pen = new Pen(this.BackColor, 0)) { g.DrawRectangle(pen, 1, 1, this.Width - 3, this.Height - 3); } } #endregion Private Methods } } Tag: Handling the message pump for a UserControl Tag: 84097
  - 22
    - Possible bug using non system fonts Hi there. I've for the past few days been experimenting with the use of non system fonts via the PrivateFontCollection.AddFontFile() method. If i do something like this: private void button1_Click(object sender, System.EventArgs e) { System.Drawing.Text.PrivateFontCollection pfc = new System.Drawing.Text.PrivateFontCollection(); pfc.AddFontFile("FREE3OF9.TTF"); FontFamily fam = new FontFamily("Free 3 of 9", pfc); Font f = new Font(fam, 10F); this.listBox1.Items.Add(f); } and clicks the button about 5 times or so, the font objects get messed up and thrwos an exception in, among others, the name property. Any suggestions? Tag: Handling the message pump for a UserControl Tag: 84095
  - 23
    - The private components field: where is used? Hi there Every time I create a new Form in the VS 2003 IDE i see the following entry private System.ComponentModel.Container components = null; which constantly remains null, when I add controls (say a Button) or components (say Timer) on the Form. The protected Dispose() checks if (components != null) which always returns false. Questions: 1. Where and when that private "components" field is used? 2. If it is always null a. can I delete it safely? b. why I don't see any compiler warning? Also, that same declaration private System.ComponentModel.Container components = null; is done by the IDE when I create a new Component or CustomControl file. But I don't intend to use it. Do I really need it? Best regards Theo ------------------------ Theo Bebekis Thessaloniki, Greece ------------------------ Tag: Handling the message pump for a UserControl Tag: 84094
  - 24
    - Winforms design with class in nested namespaces hi i am working on a gui for a bigger project using managed c++ and wanted to put it in the namespace hierachy under cubes::gui so i did this in my form.h namespace cubes{ namespace gui{ public class [...] }} but now the design view does not work... it only does with ony one given namespace like ... namespace gui{ public class [...] } how do i make my forms live in cubes::gui and still be able to use the form designer? regards Florian Demmer Tag: Handling the message pump for a UserControl Tag: 84092
  - 25
    - Capturing user interaction Hello NG, in my MDI-App, I'd like to checkfor how long the User hasn't done anything (moved the mouse, pressed a key) so that I can do some stuff after a given amount of idle time. My first idea was to save the current time in a variable every time the user moves the mouse or presses a key so that i can use that variable to calculate idle time. I ran into a problem at the very start though. The MouseMove Event of my MDI parent form is never fired. Is that standard behaviour for MDI containers? What would be an elegant way to capture the point in time of the last user interaction? Tag: Handling the message pump for a UserControl Tag: 84088

Hi,
Im wondering how a UserControl can be created using native win32 code.
The reason for doing this is that i need to have access to the message pump
and a way to render to it in the fastest possible way using managed DX.

The "UserControl" will be hosted in a IE browser.

Cheers,

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RE: Handling the message pump for a UserControl by JBL

JBL
Sun Feb 20 07:53:02 CST 2005

Hmm ... i have written the control in native win32 code, but it only works
when its not a child ( WS_CHILD ) . It's not embedded in the page ( like a
regular UserControl ) and i really would like to acceive that.
I've tried supplying the internet explorer_server window ( using FindWindow
with the classname = "Internet Explorer_Server" ) as the parent, but it
doesn't work either.
Does anyone know how the UserControl is created and how i can code it in
native code?
Any help would be appriciated!

"JBL" wrote:

> Hi,
> Im wondering how a UserControl can be created using native win32 code.
> The reason for doing this is that i need to have access to the message pump
> and a way to render to it in the fastest possible way using managed DX.
>
> The "UserControl" will be hosted in a IE browser.
>
> Cheers,
>
>

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