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Urgent help needed - handle to application window

Posted on 1998-11-30
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Last Modified: 2013-11-20
Hi,

HELP!! I am new to MFC programming and I'm really struggling with what seems like a really simple problem.

Ok, I have created an application using AppWizard. I have now started adding functionality to the application (the app will control a TWAIN complient scanner, and perform some image processing techniques). The code that is supplied with the TWAIN SDK uses the handle to window value (hwnd). The problem I have is obtaining this value when using MFC. I have tried everything I can think of, and desperately need some help.

I have tried: CWnd m_hWnd - no luck. I can't get FindWindow to work either.

Any help would be greatly appreciated.
Thanks,
J.P.Bourne

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Question by:jpbourne
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4 Comments
 
LVL 3

Accepted Solution

by:
plaroche earned 50 total points
ID: 1325520
This all depends on what window will handle the driver's notifications.

From any CWnd derived class you get the handle to it with:

GetSafeHwnd();
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LVL 3

Expert Comment

by:plaroche
ID: 1325521
Pleas take not that GetSafeHwnd will return a valid handle only after OnCreate for the base class has been called.
0
 

Author Comment

by:jpbourne
ID: 1325522
I can only see the following OnCreate statement in the entire project:

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
   :
}

Is this the correct place to insert the GetSafeHwnd() statement?

And BTW, your help really is appreciated.
JPB.
0
 

Author Comment

by:jpbourne
ID: 1325523
I tried what you suggested in the CMainFrame::OnCreate and it worked!

Thanks for your help plaroche.
JPB
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