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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| user32.lib
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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GetClassWord
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 are obsolete in the Win32
API. 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
| );
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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.
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GCW_HICONSM
| Retrieves the handle of the small icon associated with the window.
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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
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