SetClassWord
The SetClassWord
function 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.
WORD SetClassWord(
|
HWND hWnd, |
// handle of window |
|
int nIndex, |
// index of value
to change |
|
WORD wNewWord |
// new value |
|
); |
|
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 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.
wNewWord
Specifies the
replacement value.
Return Values
If the
function succeeds, the return value is the previous value of the specified
16-bit integer.
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.
The GCW_
values are obsolete in the Win32 API. You must use the SetClassLong
function to set the class values previously set by using the GCW_ values with
the SetClassWord function.
See Also