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.
WORD GetClassWord( [in] HWND hWnd, [in] int nIndex );
A handle to the window and, indirectly, the class to which the window belongs.
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.
||Retrieves an ATOM value that uniquely identifies the window class. This is the same atom that the RegisterClass or RegisterClassEx function returns.|
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.
|Minimum supported client||Windows 2000 Professional [desktop apps only]|
|Minimum supported server||Windows 2000 Server [desktop apps only]|
|Header||winuser.h (include Windows.h)|
|API set||ext-ms-win-ntuser-windowclass-l1-1-2 (introduced in Windows 10, version 10.0.10240)|