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Chapter 6 - Sequence Grabber Channel Components / Sequence Grabber Channel Components Reference

Functions / Controlling Sequence Grabber Channel Components

SGStartPreview

The SGStartPreview function instructs your channel to begin processing its source data. In preview mode, your component does not save any of the data it gathers from its source.

pascal ComponentResult SGStartPreview (SeqGrabComponent s);

s

Identifies the sequence grabber component that has connected to your channel component.

DESCRIPTION

Your channel component should immediately present the data to the user in the appropriate format, according to your channel's configuration (see "Configuration Functions for All Channel Components," which begins on page 6-44, for information about functions that configure channels). Display video data in the destination display region; play sound data at the specified volume settings.

RESULT CODES

cantDoThatInCurrentMode	-9402	Request invalid in current mode
deviceCantMeetRequest	-9408	Device cannot support grabber

File Manager errors
Memory Manager errors

SEE ALSO

The sequence grabber component stops the preview process by calling your SGStop function, which is described on page 6-41.

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