SetClassWord

The SetClassWord function replaces the 16-bit (word) value at the specified offset into the extra class memory for the window class to which the specified window belongs.

WORD SetClassWord(

HWND hWnd,	// handle of window
int nIndex,	// index of value to change
WORD wNewWord	// new value
);

Parameters

hWnd

Identifies the window and, indirectly, the class to which the window belongs.

nIndex

Specifies the zero-based byte offset of the value to be replaced. Valid values are in the range zero through the number of bytes of class memory minus two; for example, if you specified 10 or more bytes of extra class memory, a value of 8 would be an index to the fifth 16-bit integer.

wNewWord

Specifies the replacement value.

Return Values

If the function succeeds, the return value is the previous value of the specified 16-bit integer.

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

Remarks

Reserve extra class memory by specifying a nonzero value in the cbClsExtra member of the WNDCLASS structure used with the RegisterClass function.

The GCW_ values are obsolete in the Win32 API. You must use the SetClassLong function to set the class values previously set by using the GCW_ values with the SetClassWord function.

See Also

GetClassLong, GetClassWord, RegisterClass, SetClassLong, WNDCLASS

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