RegisterClassEx info  Overview  Group

The RegisterClassEx function registers a window class for subsequent use in calls to the CreateWindow or CreateWindowEx function. The RegisterClass function does not allow you to set the small icon.

ATOM RegisterClassEx(

CONST WNDCLASSEX *lpwcx	// address of structure with class data
);

Parameters

lpwcx

Points to a WNDCLASSEX structure. You must fill the structure with the appropriate class attributes before passing it to the function.

Return Values

If the function succeeds, the return value is an atom that uniquely identifies the class being registered.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

All window classes that an application registers are unregistered when it terminates.

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

See Also

CreateWindow, CreateWindowEx, GetClassInfoEx, GetClassName, RegisterClass, UnregisterClass, WindowProc,WNDCLASSEX