Problems processing WM_NCCREATE

This is a discussion on Problems processing WM_NCCREATE within the Windows Programming forums, part of the Platform Specific Boards category; Ok, im not really having problems processing the WM_NCCREATE message, but if i trap it instead of WM_CREATE my window ...

  1. #1
    Registered User xds4lx's Avatar
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    Problems processing WM_NCCREATE

    Ok, im not really having problems processing the WM_NCCREATE message, but if i trap it instead of WM_CREATE my window is created without a title. Is there some reason for it? I didnt change anything but WM_NCCREATE to WM_CREATE and now the window has a title again, but if i change it back to WM_NCCREATE there is no title. Any suggestions?
    "only two things are infinite, the universe and human stupidity, and im not sure about the former." - albert einstein

  2. #2
    S­énior Member
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    If you let the WM_NCCREATE handler fall through to DefWindowProc() you should get the title back.

  3. #3
    Registered User xds4lx's Avatar
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    Well isnt that a bad idea? Because according to MSDN you should return TRUE if your application handles the WM_NCCREATE message, so wouldnt letting it fall through to DefWindowProc be bad?
    "only two things are infinite, the universe and human stupidity, and im not sure about the former." - albert einstein

  4. #4
    &TH of undefined behavior Fordy's Avatar
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    >>because according to MSDN you should return TRUE if your application handles the WM_NCCREATE message, so wouldnt letting it fall through to DefWindowProc be bad?

    I would say that you are not handling the default actions of the handler for WM_NCCREATE.......

    Code:
    case WM_NCCREATE: 
    	lpCreateStruct = (LPCREATESTRUCT) lParam;
                SetWindowText(hwnd,lpCreateStruct->lpszName);
    	return TRUE;
    I see your problem and so tried coding the above.....

    Now with this code, the window name will appear...I must warn you though that I am not sure if any other tasks are performed by the default handler for this message......therefore it may develop a few bugs.....try it though

  5. #5
    Registered User xds4lx's Avatar
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    So, should I just do what Sorensen suggested and just let it go to the DefWndProc after I get what I need done?
    "only two things are infinite, the universe and human stupidity, and im not sure about the former." - albert einstein

  6. #6
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    Unless you're trapping it to specifically stop it from being handled by DefWndProc() because you want to change the default behavior, I don't see any problem with letting it fall through. If you hadn't included a handler it'd be sent there anyway.

  7. #7
    Registered User xds4lx's Avatar
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    No, im just stopping it to grap my this pointer and throw it into the window's user data using SetWindowLong(hWnd, GWL_USERDATA, (LONG)lpcs->lpCreateParams). nothing less nothing more, so I just returned defwindowproc and now it works, thanx guys.
    "only two things are infinite, the universe and human stupidity, and im not sure about the former." - albert einstein

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