Inside Macintosh: QuickTime Components /

Chapter 5 - Sequence Grabber Components / Sequence Grabber Components Reference

Sequence Grabber Component Functions / Working With Channel Characteristics

SGSetChannelRefCon

The SGSetChannelRefCon function allows you to set the value of a reference constant that is passed to your callback functions (see "Video Channel Callback Functions" beginning on page 5-95 for information about the callback functions that are supported by video channels).

pascal ComponentResult SGSetChannelRefCon (SGChannel c, 
                                           long refCon);

c

Specifies the reference that identifies the channel for this operation. You obtain this reference from the SGNewChannel function, described on page 5-29.

refCon

Specifies a reference constant value that is to be passed to your callback functions for this channel. See "Video Channel Callback Functions" on page 5-95 for information about the callback functions that are supported by video channels. Sound channels do not support callback functions.

SPECIAL CONSIDERATIONS

Sound channels do not support callback functions.

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