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PostVirtualMouseEvent
- 0 2.0
Posts a virtual mouse code to Windows.
PostVirtualMouseEvent( UINT wMouseFlags, int xPos, int yPos )
Parameters
wMouseFlags
Flags indicating the type of mouse event. This can be one or more of the
following values, combined by a bitwise-OR operator.
Constant
| Description
| VWM_MOUSEMOVE
| Simulates a change in the mouse cursor position. This flag can be combined
with any of the other flags in this table.
| VWM_MOUSELEFTDOWN
| Simulates pushing the left mouse button.
| VWM_MOUSELEFTUP
| Simulates releasing the left mouse button.
| VWM_MOUSERIGHTDOWN
| Simulates pushing the right mouse button.
| VWM_MOUSERIGHTUP
| Simulates releasing the right mouse button.
|
xPos
The x-axis position in screen coordinates.
yPos
The y-axis position in screen coordinates.
Return Value
This function does not return a value.
Comments
The x- and y-axis positions are absolute positions in screen coordinates. Note
that the x and y values should not exceed the screen-resolution limits. Values
greater than the maximum resolution in the x-direction (640 for standard VGA)
or the y-direction (480 for standard VGA) cause an overflow.
The events are posted to the system message queue. The application with the
input focus can receive the messages by calling the Windows GetMessage or PeekMessage message.
Because of the way Windows interprets mouse messages, the calling application
must be careful about the order in which events are sent to the system. A
message that represents both a button-state transition and a move generates first a
Windows event for the button transition at the current pointer location and
then a move to the new location. To simulate a move to a new location followed by
a button transition, the application must make separate calls to PostVirtualMouseEvent for each simulated event.
Example
When posting events, the caller should bracket the calls by calls to AtomicVirtualEvent, which locks out pen packets while the application is posting simulated mouse
events. For example, the following code fragment posts a mouse event:
AtomicVirtualEvent(TRUE);
//
// ... PostVirtualMouseEvent calls go here
//
AtomicVirtualEvent(FALSE);
The Windows GetMessageExtraInfo function returns 0 for any messages generated by PostVirtualMouseEvent.
See Also
AtomicVirtualEvent, PostVirtualKeyEvent
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