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What can cause CreateWindowEx to fail?

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I think I''m making a silly mistake, only I don''t exactly know what it IS. Here''s the relevant line: m_hWnd = CreateWindowEx( NULL, Name, Name, dwExStyle, CW_USEDEFAULT, CW_USEDEFAULT, Width, Height, NULL, NULL, hInstance, NULL ); hInstance is valid, Name is just a pointer to a char array, Width and Height are typical int''s, and dwExStyle is just a DWORD that equals WS_OVERLAPPEDWINDOW. I can''t see why this should fail, but m_hWnd keeps coming out NULL. ANy ideas? ----------------------------- The sad thing about artificial intelligence is that it lacks artifice and therefore intelligence.

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You also set your window class to be Name. I doubt you've actually registered a Window class with that name. Also, although the value WS_OVERLAPPEDWINDOW is correct (so it won't be the cause of this problem), that position is actually the style, not the extended style. Finally, the second CW_USEDEFAULT isn't necessary.

Try something like this:

    
LRESULT CALLBACK MyWndProc (HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
return DefWindowProc (hWnd, Msg, wParam, lParam);
}

WNDCLASS wc;
ZeroMemory (&wc, sizeof (wc));
wc.lpfnWndProc = (WNDPROC)MyWndProc;
wc.hInstance = hInstance;
wc.hCursor = LoadCursor (NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
wc.lpszClassName = "MYWINDOW";
RegisterClass (&wc);

DWORD dwStyle = WS_OVERLAPPEDWINDOW;
DWORD dwExStyle = 0;

m_hWnd = CreateWindowEx (dwExStyle, "MYWINDOW", Name, dwStyle, CW_USEDEFAULT, 0, Width, Height, NULL, NULL, hInstance, NULL);



Edited by - Kippesoep on December 29, 2001 7:32:40 PM

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I got it. Wasnt the RegisterClassEx, i checked that first. Turns out that I forgot to set the wc.hInstance to hInstance. Seems kind of redundant to set it twice...anywayz, it was just a silly mistake like i said. I noticed that I put the dxExStyle in the wrong spot, that was sposed t be named dwStyle, then a dwExStyle elsewheres....oh well. I got my prob solved.

-----------------------------
The sad thing about artificial intelligence is that it lacks artifice and therefore intelligence.

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