CancelDC
The CancelDC
function cancels any pending operation on the specified device context (DC).
BOOL CancelDC(
|
HDC hdc |
// handle to device
context |
|
); |
|
Parameters
hdc
Identifies
the DC.
Return Values
If the
function succeeds, the return value is nonzero.
If the
function fails, the return value is zero.
Remarks
The CancelDC
function is used by multithreaded applications to cancel lengthy drawing
operations. If thread A initiates a lengthy drawing operation, thread B may
cancel that operation by calling this function.
If an
operation is canceled, the affected thread returns an error and the result of
its drawing operation is undefined. The results are also undefined if no
drawing operation was in progress when the function was called.
See Also