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RegisterClass info  Overview  Group

The RegisterClass function registers a window class for subsequent use in calls to the CreateWindow or CreateWindowEx function.

The RegisterClass function has been superseded by the RegisterClassEx function. You can still use RegisterClass, however, if you do not need to set the class small icon.

ATOM RegisterClass(

    CONST WNDCLASS *lpWndClass 

// address of structure with class data



Points to a WNDCLASS 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.


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

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

See Also

CreateWindow, CreateWindowEx, GetClassInfo, GetClassName, RegisterClassEx, UnregisterClass, WindowProc, WNDCLASS

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