Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!usc!apple!cjp
From: cjp@Apple.COM (Chris Plummer)
Newsgroups: comp.sys.mac.programmer
Subject: Re: ResError Bug?
Message-ID: <32877@apple.Apple.COM>
Date: 5 Jul 89 21:16:52 GMT
References: <5914@hubcap.clemson.edu> <14217@dartvax.Dartmouth.EDU>
Organization: Apple Computer Inc, Cupertino, CA
Lines: 28

In article <14217@dartvax.Dartmouth.EDU> isle@eleazar.dartmouth.edu (Ken Hancock) writes:
>In article <5914@hubcap.clemson.edu> mikeoro@hubcap.clemson.edu (Michael K O'Rourke) writes:
>>I am trying to read a PICT resource into my application.  I have a if-then
>>statment which checks to see if the resource really existed, but it never 
>>gets called in the error case.
>>
>>pict := PicHandle(Get1Resource('PICT',pictNumber));
>>if ResError = noErr then
>>    { do something}
>>
>>Well, i went in and found out that ResError ALWAYS returns noErr. What's up?
>
>The correct check is:
>
>if (pict <> NIL)  or for C tyes if (pict != NIL )
>
>This, by the way, is in fact documented in inside mac in the
>Resource Manager chapter.  If a GetResource call cannot find
>the resource, it returns a NIL handle but does not generate
>a resource mamager error.


Not quite.  ResError will return noErr if the resource **type** is not
found.  If the resource type is found but the resource is not then
ResError should return resNotFound.  The is all documented in IM I-119.
By the way, if you use the Inside Mac DA, the writeup for GetResource
does not include the note from IM I that talks about ResError returning
noErr if the resource type isn't found.