Inside Macintosh: QuickTime /

Chapter 2 - Movie Toolbox / Movie Toolbox Reference

Time Base Functions / Time Base Callback Functions

CancelCallBack

You use the CancelCallBack function to cancel a callback event before it executes.

pascal void CancelCallBack (QTCallBack cb);

cb

Specifies the callback event for this operation. You obtain this value from the NewCallBack function (described on page 2-317).

DESCRIPTION

The CancelCallBack function removes the callback event from the list of callback events maintained by the Movie Toolbox. The Movie Toolbox calls this function automatically when it invokes your callback function. In order for a callback event to be scheduled, you must call the CallMeWhen function, which is described in the previous section.

ERROR CODES

None