Thread: RegisterClassEx fails on Win95

The program works fine on my Win2k machine, but on Win95 the following happens:
I'm creating an app, creating the main window works fine, but when i try to create the child windows, the registerclassex function fails. GetLastError() returns 0.
Any clues??
Code for child window:

Code:

int questWnd(HINSTANCE hThisInstance, HWND hWndOwner){
	WNDCLASSEX wincl;		// Data structure for the windowclass 
	MSG messages;	

	if(!GetClassInfoEx(hThisInstance, "ddqWnd", &wincl)){	// Sjekk om klassen er registrert fra før
		// The Window structure 
		wincl.hInstance = hThisInstance;
		wincl.lpszClassName = "ddqWnd";
		wincl.lpfnWndProc = formProc;	// This function is called by windows 
		wincl.style = CS_DBLCLKS;			// Catch double-clicks 
		wincl.cbSize = sizeof(WNDCLASSEX);

		// Use default icon and mouse-pointer 
		wincl.hIcon = LoadIcon (NULL, IDI_ASTERISK);
		wincl.hIconSm = LoadIcon (NULL, IDI_ASTERISK);
		wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
		wincl.lpszMenuName = NULL;                 // No menu 
		wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
		wincl.cbWndExtra = 0;                      /* structure or the window instance */
		/* Use Windows's default color as the background of the window */
		wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
		if(!RegisterClassEx(&wincl)){
			achBuf=NEW char[100]; sprintf(achBuf, "GetLastError=%lu", GetLastError());b(achBuf);
			return(0);
		}
	}

From MSDN:

Windows 95/98/Me: All window classes registered by a dynamic-link library (DLL) are unregistered when the .dll is unloaded.

Windows NT/2000/XP: No window classes registered by a DLL are unregistered when the DLL is unloaded. A DLL must explicitly unregister its classes when it is unloaded.

Windows 95/98/Me: RegisterClassEx fails if the cbWndExtra or cbClsExtra member of the WNDCLASSEX structure contains more than 40 bytes.

Windows 95/98/Me: RegisterClassExW is supported by the Microsoft® Layer for Unicode (MSLU). To use this version, you must add certain files to your application, as outlined in Microsoft Layer for Unicode on Windows 95/98/Me Systems.

I am familiar with that, and as you can see from the code, i set the cbClsExtra & wincl.cbWndExtra to 0.
The program is an .Exe.

The strange thing is that it worked earlier. I'm subclassing some edit boxes and buttons to capture keystrokes, and using functions from sql.h. I'm wondering if there could be any of these functions that mess up the program...?

I figured it out:
GetClassInfoEx(hThisInstance, "className", &wincl)
always returned 0, hence the class was registered each time i opened the window..
Can anyone explain this to me?

The first posting contains the code. It uses GetClassInfoEx(hThisInstance, "ddqWnd", &wincl) to check if the class is registered... This function aleays returns 0 in my code...

Code:

WNDCLASSEX wincl;
	static BOOL classRegistered(FALSE);

	if(!GetClassInfoEx(hThisInstance, "ddWndCls", &wincl)){
		classRegistered=TRUE;
		wincl.cbSize = sizeof(WNDCLASSEX);
		wincl.hInstance = hThisInstance;
		wincl.lpszClassName = "ddWndCls";
		wincl.lpfnWndProc = windowProc;
		wincl.style = CS_DBLCLKS;
		wincl.hIcon = LoadIcon (NULL, IDI_ASTERISK);
		wincl.hIconSm = LoadIcon (NULL, IDI_ASTERISK);
		wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
		wincl.lpszMenuName = NULL;
		wincl.cbClsExtra = 0;
		wincl.cbWndExtra = 0;
		wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
		if(!RegisterClassEx(&wincl))
			return 0;
	}