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From: johnsone@uxh.cso.uiuc.edu (Erik A. Johnson)
Newsgroups: comp.sys.mac.programmer
Subject: Check DialogPtr returned by GetNewDialog?
Message-ID: <1991Apr1.052536.27902@ux1.cso.uiuc.edu>
Date: 1 Apr 91 05:25:36 GMT
Sender: usenet@ux1.cso.uiuc.edu (News)
Organization: University of Illinois at Urbana
Lines: 26

Do any of you check to see if the DialogPtr that GetNewDialog returns is
valid in any way?  Is there any way to determine that GetNewDialog had no
problems (i.e. it found the necessary resources and got the necessary
memory allocated)?  IM-I-413 says "If either the dialog template resource
or the item list resource can't be read, the function result is undefined."

I tried:

    DialogPtr aDialogPtr;
      ...
    aDialogPtr = 0L;
    aDialogPtr = GetNewDialog( ... );
    if (aDialogPtr == 0L)
      { /* got some sort of error */
       }
    else
      { /* do the dialog stuff */
       }

This seems to work, but given the above quote from IM, I'm hesitant to count
on it working.  Any suggestions?  E-mail and I'll summarize.  Thanks.


Erik A. Johnson, Graduate Student        \ Internet:  johnsone@uxh.cso.uiuc.edu
Aeronautical & Astronautical Engineering  \
University of Illinois at Urbana-Champaign \ AmericaOnline: ErikAJ