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From: ksitze@nmsu.edu (Kevin Sitze)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Control Bars
Message-ID: <KSITZE.89May15124731@picuris.nmsu.edu>
Date: 15 May 89 18:47:31 GMT
References: <5706@microsoft.UUCP>
Sender: news@nmsu.edu
Organization: NMSU Computer Science
Lines: 46
In-reply-to: peterbak@microsoft.UUCP's message of 12 May 89 16:38:22 GMT

Relatively simple...  Your call to FindControl:

	tempInt = FindControl(&MousePoint, myWindow, &whichControl);

Should be

	tempInt = FindControl(MousePoint, myWindow, &whichControl);

and accordingly the calls to TrackControl should be:

	For Thumb:
	TrackControl(whichControl, MousePoint, nil);

	For rest:
	TrackControl(whichControl, MousePoint, MoveScrollbar);

A point is 4 bytes long and should be passed directly.  A pointer to
the point will give the wrong value.

Finally, the reason everything blows up in your face:

You have to tell C that the routine is expected to be called from the
toolbox.  E.g. Pascal compatable:

pascal MoveScrollbar(theControl, partCode)
ControlHandle	theControl;
int		partCode;
{
}

Have fun!!

			-Kelesi
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