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Create Window Error - Solved

General and Gameplay Programming Programming

Started by clrscr April 25, 2005 08:55 PM

5 comments, last by clrscr 18 years, 12 months ago

clrscr

158

Author

April 25, 2005 08:55 PM

What would cause CreateWindowEx to return The system cannot find the file specified, I've been working on it for awhile and I'm lost. Thanks a lot for your help. [Edited by - clrscr on April 26, 2005 10:01:06 PM]

-----------------------------When men speak of the future, the Gods laugh.An apology for the devil: it must be remembered that we have heard one side of the case. God has written all the books.Samuel Butler (1835 - 1902)

LessBread

1,415

April 25, 2005 09:36 PM

HWND CreateWindowEx(  DWORD dwExstyle,      // extended window style  LPCTSTR lpClassName,  // registered class name  LPCTSTR lpWindowName, // window name  DWORD dwstyle,        // window style  int x,                // horizontal position of window  int y,                // vertical position of window  int nWidth,           // window width  int nHeight,          // window height  HWND hWndParent,      // handle to parent or owner window  HMENU hMenu,          // menu handle or child identifier  HINSTANCE hInstance,  // handle to application instance  LPVOID lpParam        // window-creation data);

As a guess, one of the arguments to the function is probably wrong. Quite likely the hMenu argument, but maybe the hInstance argument. You'll have to provide more information - such as a snippet of the code that calls CreateWindowEx. For best results, put the code snippet inside <source> </source> blocks - don't forget to replace the angle brackets with square ones [ ]. :)

"I thought what I'd do was, I'd pretend I was one of those deaf-mutes." - the Laughing Man

clrscr

158

Author

April 25, 2005 09:51 PM

DWORD style = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; DWORD exstyle = WS_OVERLAPPEDWINDOW;CreateWindowEx(exstyle, "MIP","MIPS",		WS_CLIPSIBLINGS |WS_CLIPCHILDREN|style,		0,0,		wr.right-wr.left,		wr.bottom-wr.top,		NULL,		NULL,		hInstance,		NULL);

LessBread

1,415

April 25, 2005 10:32 PM

That code looks ok to me. The error may not have anything to do with CreateWindowEx, even though the debugger suggests it. There might be code in the WM_CREATE handler case of the WndProc that is causing the error which is then bubbling up to appear as if the problem is with CreateWindowEx. CreateWindowEx also sends WM_NCCREATE and WM_NCCALCSIZE messages. If you have handlers for those messages, the problem could be in those handlers too. I'm guessing you might have some file opening code in the WM_CREATE handler.

"I thought what I'd do was, I'd pretend I was one of those deaf-mutes." - the Laughing Man

EkEk

124

April 25, 2005 10:36 PM

is it possible because the window class is not registered??

clrscr

158

Author

April 25, 2005 11:12 PM

So I tracked the error down to being an Invaild Pixel Format which only occurs when I run my program in Windowed mode

	int npf;	static PIXELFORMATDESCRIPTOR pfd = {		sizeof(pfd),			1,			PFD_DRAW_TO_WINDOW |			PFD_SUPPORT_OPENGL |			PFD_DOUBLEBUFFER,			PFD_TYPE_RGBA,			32,			0,0,0,0,0,0,			0,			0,			0,			0,0,0,0,			16,			0,			0,			PFD_MAIN_PLANE,			0,			0,0,0 };		npf = ChoosePixelFormat( ghDC, &pfd);		if(!npf)		{			GetSystemError();		}		if(!SetPixelFormat(ghDC,npf,&pfd))		{			GetSystemError();		}

Thanks again for all your help