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What? You want Microsoft to do everything for you, just the way you want it? 
That's why we write code! We want it done OUR way!! 
RageInTheMachine9532
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We want it our way, but we also want some free time to chill out and watch tv 
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I'm having a problem with using the Web Browser ActiveX control in a C# windows form app. The circumstance is easily reproducable:
Create the boiler plate example of this using the VS toolbox to create the ActiveX wrapper and add then drag it into your C# form.
Now, open up a web page with your forms app. For instance, mail.yahoo.com. Click in the user name entry field so that focus is there. Now minimize your form app and then bring it right back up. All of a sudden that entry field no longer has the focus.
I have another example using this control through a VC++ 6 MFC SDI app and ironically, it works fine there (the entry field still has focus).
Any ideas on what to look at? I thought it might have to do with message routing differences between windows forms and MFC SDI but hooking the app up to Spy++ didn't reveal anything. Now I'm thinking it's a problem with the .NET generated wrapper but I'm at a loss as to what to do about it.
???
any help appreciated!
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I'm wanting to create a ToolBarMenu with a few combo boxes... I'm having problems on figuring this out.
Does anyone have any sample code to do this? (for .Net Framwork 1.1)
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I have multiple projects in a solution and I am trying to create dependencied, but when i was trying to add a project reference i got the following message:
A reference to NDMUI could not be added. An assembly must have a "dll" extension in order to be referenced.
I do not not how to resolve it......may someone please help!
Tryin' my best
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VS.NET doesn't let you reference a .exe. It is possible, but you'll have to use the command line compiler (csc.exe) or a build tool like NAnt[^].
Microsoft MVP, Visual C#
My Articles
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I figure that to draw my little windows style borders, i need to actualy have a valid handle to the grahics device for the control.
Now, I have this section of code i have included in my component constructor that causes a problem:
Graphics clientDC = this.CreateGraphics(); <br />
IntPtr hdc = clientDC.GetHdc(); <br />
pDC = ThemeAPI.CreateCompatibleDC(hdc);<br />
clientDC.Dispose();
That throws the following error on run time:
An unhandled exception of type 'System.InvalidOperationException' occurred in system.drawing.dll
Additional information: The object is currently in use elsewhere.
Now, i know it's caused by the existence of the ClientDC, but i'm not sure how to go about solving this one.
I need to get the creatgraphics for the component in question, but I guess, as i'm creating three duplicate components at initialisation, it's running three seperate threads at once, and it's not liking the use of the Device Context. If i don't dispose of it, the program runs for a while before crashing.
Should I construct a graphics handle in the parent form?
Cata
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Call clientDC.ReleaseHdc(pDC) when you're done with the HDC, then dispose your Graphics object.
Microsoft MVP, Visual C#
My Articles
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Okey dokey, works now.
I was trying to use P/Invoke DeleteDC(pDC). It clearly wasn't happy with that.
But i've still got nothing drawn on my background. I think i have the object values right, and i've tried a number of values for iState. So i'm not entirely sure why nothing is appearing. Here is the code
<br />
pTHEME = ThemeAPI.OpenThemeData(this.Handle,"Window");<br />
<br />
Graphics clientDC = this.CreateGraphics(); <br />
IntPtr hdc = clientDC.GetHdc(); <br />
pDC = ThemeAPI.CreateCompatibleDC(hdc);<br />
<br />
ThemeAPI.Rect rect = new ThemeAPI.Rect();<br />
rect.left = this.Location.X;<br />
rect.top = this.Location.Y;<br />
rect.right = this.Location.X + this.Size.Width;<br />
rect.bottom = this.Location.Y + this.Size.Height;<br />
<br />
int result;<br />
result = ThemeAPI.DrawThemeBackground(pTHEME,pDC,5,1,ref rect,IntPtr.Zero);<br />
result = ThemeAPI.DrawThemeBackground(pTHEME,pDC,7,1,ref rect,IntPtr.Zero);<br />
result = ThemeAPI.DrawThemeBackground(pTHEME,pDC,8,1,ref rect,IntPtr.Zero);<br />
result = ThemeAPI.DrawThemeBackground(pTHEME,pDC,9,1,ref rect,IntPtr.Zero);<br />
<br />
clientDC.ReleaseHdc(pDC);<br />
clientDC.Dispose();
What do you make of it?
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Deleting the HDC that way is fine if you don't use Graphics.GetHdc to get it. The reason is that the unmanaged pointer that the Graphics references needs to be freed, otherwise the Graphics object will complain about having an invalid handle when the Graphics.Dispose method tried to delete it.
Microsoft MVP, Visual C#
My Articles
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You get that error when the application is not loaded into an STA (single-threaded apartment). Make sure you use the STAThreadAttribute on your entry point and that any controls in your library used in an application are created in the main thread.
Microsoft MVP, Visual C#
My Articles
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Too late m8!
Got to that one on my own 
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there are lots of examples on how to set up child form from the MainMDI but i cant find anything on how to open a form from another child form and setting the MDIParent so as it becomes child form, where am i going wrong???
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So long as you're not talking about an MDI child form within another MDI child form (which isn't supported in the .NET FCL), you can simply get the parent MDI form of the first child and add the new child as an MDI child of the parent:
MDIChildForm child = new MDIChildForm();
if (MdiParent != null)
MdiParent.AddOwnedForm(child);
Microsoft MVP, Visual C#
My Articles
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fantastic response and worked first time.
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How can i make a panel that can receive a focus
I used the GotFocus and LostFocus events to turn the panel blue when focussed. But how can i set the CanReceiveFocus Property true so that you can use your keyboard (Tab and arrows) to give that control the focus. (That panel also conatains a picturebox and a label).
Thanks
Jonathan Slenders
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Extend the control and in your constructor call SetStyle(ControlStyles.Selectable, true).
Microsoft MVP, Visual C#
My Articles
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Hello,
May I know how I can create a 2 dimension textbox array? I know how to create a 1 dimension textbox array, but I am having trouble trying the 2D. Thank you!!
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It depends what kind of multi-dimensional array. There are multi-dimensional arrays and jagged arrays. The former is declared like this:
TextBox[,] boxes = new TextBox[,] {{textBox1, textBox1},
{textBox1, textBox2}, {textBox2, textBox2}};These types of arrays have fixed dimensions and sizes.
Jaggaed arrays' elements are arrays themselves, like this:
TextBox[][] boxes = new TextBox[] {
new TextBox[] {textBox1, textBox1},
new TextBox[] {textBox1, textBox2},
new TextBox[] {textBox2, textBox2},
new TextBox[] {textBox1},
new TextBox[] {textBox2}};As you can see, these can have different dimensions and sizes.
You can find more information by reading about Arrays[^] in the Visual C# language documentation.
Microsoft MVP, Visual C#
My Articles
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Thank you
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I've created a component Library, and i've built the P/Invoce commands into it to build a windows style component. However, when i try and run the following lines internaly from the component, or Externaly from the parent window, i get the "DragDrop registration failed."
<br />
pTHEME = ThemeAPI.OpenThemeData(this.Handle,"Window");<br />
<br />
IntPtr pDC = ThemeAPI.CreateCompatibleDC(IntPtr.Zero);<br />
I put a break point after these two lines, and they process ok for each window, producing pointers and executing successfuly. However, the program then skips to the end of the Main method, and throws the error.
Why is it doing this? I've read that it's a problem with Web Deployed Apps in .NET v1.0. But i have V1.1 and it's not a web app.
What can i do to solve it?
Cheers
Cata
Note: I have enabled windows styles as well, so that's not the problem.
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The Catalyst wrote:
IntPtr pDC = ThemeAPI.CreateCompatibleDC(IntPtr.Zero);
I dont know much of themes, but why are you passing a "NULL" pointer? Shouldnt you pass this.Handle instead?
top secret
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I figured my origional problem.
But you do still have a good point. Might explain why it's not drawing anything now. 
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Hi
I am planning to start a research on Data Mining techniques for Intrusion Detection. It would be very helpful for me if any one of you cna help me in getting the code for some basic algorithms like Apriori, K-Means hierachical clustering, Decision Tree in C# or C++. Please let me know if any body else is in the same field.
my email id is sreelakshmibobba@hotmail.com
Thanks
srilakshmi
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