ExcludeUpdateRgn
Syntax
int ExcludeUpdateRgn(hDC,hWnd)
This function prevents drawing within invalid areas of a window by excluding an updated region in the window from a clipping region.
| Parameter |
Type/Description |
|
| hDC |
HANDLE Identifies the device context associated with the clipping region. |
|
| hWnd |
HWND Identifies the window being updated. |
|
Return Value
This value specifies the type of resultant region. It can be any one of the following values:
| COMPLEXREGION |
The region has overlapping borders. |
|
| ERROR |
No region was created. |
|
| NULLREGION |
The region is empty. |
|
| SIMPLEREGION |
The region has no overlapping borders. |
|