Inside Macintosh: QuickTime Components /

Chapter 11 - Clock Components / Clock Components Reference

Movie Toolbox Clock Support Functions /

GetNextCallBack

The GetNextCallBack function returns the next callback event associated with a specified time base. Your component can use this function, along with the GetFirstCallBack function (described in the previous section), to scan all callback events associated with a time base.

pascal QTCallBack GetNextCallBack (QTCallBack cb);

cb

Specifies the starting callback event for the operation. Your clock component obtains this value from the GetFirstCallBack function or from previous calls to the GetNextCallBack function.

DESCRIPTION

The GetNextCallBack function returns the next callback event in the list managed for the specified time base. If there are no more callback events associated with the time base, the returned QuickTime callback header structure is set to nil. Your component cannot assume that the Movie Toolbox maintains the callback list in any particular order.

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