SetClassWord function (winuser.h)
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.
Syntax
WORD SetClassWord(
[in] HWND hWnd,
[in] int nIndex,
[in] WORD wNewWord
);
Parameters
[in] hWnd
Type: HWND
A handle to the window and, indirectly, the class to which the window belongs.
[in] nIndex
Type: int
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.
[in] wNewWord
Type: WORD
The replacement value.
Return value
Type: WORD
If the function succeeds, the return value is the previous value of the specified 16-bit integer. If the value was not previously set, the return value is zero.
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.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | winuser.h (include Windows.h) |
| Library | User32.lib |
| DLL | User32.dll |
See also
Conceptual
Reference