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