Advances the current position of a progress bar by a specified increment and redraws the bar to reflect the new position.
Amount to advance the position.
- Must be zero.
Returns the previous position.
If the increment results in a value outside the range of the control, the position is set to the nearest boundary.
The behavior of this message is undefined if it is sent to a control that has the PBS_MARQUEE style.
|Minimum supported client
||Windows Vista [desktop apps only]
|Minimum supported server
||Windows Server 2003 [desktop apps only]