SFGetFile & FileFilter

[Info-Mac]

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From: info-mac@uw-beaver
Newsgroups: fa.info-mac
Subject: SFGetFile & FileFilter
Message-ID:
Date: Wed, 12-Dec-84 15:58:55 EST
Article-I.D.: uw-beave.157
Posted: Wed Dec 12 15:58:55 1984
Date-Received: Fri, 14-Dec-84 06:04:42 EST
Sender: daemon@uw-beaver
Organization: U of Washington Computer Science
Lines: 23

From: [email protected]

Using the sumacc C system to provide a replacement for the default
file filter used with the standard sfgetfile dialog has the usual
amout of hair involved with calling a sumacc routine from a toolbox
routine expecting a pascal call site. Beyond this I pass on the
discovery that a false return value is minus one here and that
1, the usual false value for pascal, or 1<<7 (assuming some
confusion about which byte is the boolean) will not work. Thus:
FileFilter()
{
FileParam *a;
short *retptr;
retptr= (short *)getpargs(&a,sizeof a);
*retptr = -1;
}
Will put up a dialog that offer's no files at all. I assume
this is a bug in the toolbox,but it could be a bug in the glue,
or the documentation.
ps. Has anybody gotten the ".print" driver to work under the
original release of sumacc, I havent't found a source for the new release yet.
Ben Hyde, Cambridge
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