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GetClassWord info  Overview  Group

The GetClassWord function 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.

Other than GCW_ATOM and GCW_HICONSM, the GCW_ values support by 16-bit Windows are obsolete. You must use the GetClassLong function to retrieve the class values of a window.

WORD GetClassWord(

    HWND hWnd,

// handle of window

    int nIndex 

// offset of value to retrieve

   );

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 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:

Value

Action

GCW_ATOM

Retrieves an ATOM value that uniquely identifies the window class. This is the same atom that the RegisterClass function returns.

GCW_HICONSM

Retrieves the handle of the small icon associated with the window.

Return Values

If the function succeeds, the return value is the requested 16-bit value.

If the function fails, the return value is otherwise, it 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.

See Also

GetClassLong, RegisterClass, SetClassLong, SetClassWord, WNDCLASS 

file: /Techref/os/win/api/win32/func/src/f28_6.htm, 3KB, , updated: 2000/4/7 12:19, local time: 2025/5/3 12:06,
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