Q We need to provide more options to the user than the normal
Image Compression Dialog contains. Inside Macintosh suggests that it's possible
to provide an extra Options button in the dialog, but this seems to be a function of the
application, not the codec. Is there some flag the codec provides that tells applications to display the button?
A If your codec component has an exported function named CDRequestSettings,
then the Standard Compression dialog is smart enough to put up the specific button. In other words,
the QuickTime code checks out the codec component and adds the button (if available), handles hit
testing of the button, and calls CDRequestSettings. You will get the rect of the displayed Rect with
the coordinates if you want to display your dialog inside the other one. In many cases, it makes
sense to provide a filterProc as well for processing of update events (I guess one exception is a
totally modal dialog box).
To do a quick test, put a DebugStr inside your CDRequestSettings, and check out if the
Standard Dialog displays the button, and if hit your function is called. If this does not happen,
the CDRequestSettings function is not globally exported from the function.
See also: QuickTime Technote QT4.
[Jun 01 1995]
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