ExcludeUpdateRgn
The ExcludeUpdateRgn
function prevents drawing within invalid areas of a window by excluding an
updated region in the window from a clipping region.
int ExcludeUpdateRgn(
|
HDC hDC, |
// handle to device
context |
|
HWND hWnd |
// handle to window |
|
); |
|
Parameters
hDC
Identifies
the device context associated with the clipping region.
hWnd
Identifies
the window to update.
Return Values
The return
value specifies the complexity of the excluded region; it can be any one of the
following values:
|
Value |
Meaning |
|
COMPLEXREGION |
Region
consists of more than one rectangle. |
|
ERROR |
An error
occurred. |
|
NULLREGION |
Region is
empty. |
|
SIMPLEREGION |
Region is a
single rectangle. |
See Also