GetClassWord function (winuser.h)
Retrieves 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 GetClassWord(
[in] HWND hWnd,
[in] int nIndex
);
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 retrieved. 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 eight would be an index to the fifth 16-bit integer. There is an additional valid value as shown in the following table.
| Value | Meaning |
|---|---|
|
Retrieves an ATOM value that uniquely identifies the window class. This is the same atom that the RegisterClass or RegisterClassEx function returns. |
Return value
Type: WORD
If the function succeeds, the return value is the requested 16-bit value.
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 |
| API set | ext-ms-win-ntuser-windowclass-l1-1-2 (introduced in Windows 10, version 10.0.10240) |
See also
Conceptual
Reference