Thanks guys! As always, you've been a great help.
Especially that allocating of space hint. I should have know it was
something to be aware off.
I have the little piece of code now running like I want it to.
Sincerely,
Timothy Astle
Schettino, John <[EMAIL PROTECTED]> wrote in message
news:8203@palm-dev-forum...
>
> You've got a bug there, and the compiler warned you ;)
>
> CharPtr c points to *nothing* (or worse, a random address)
>
> You need to allocate some memory for c to point to!
>
> Something like this:
>
> UnpackTrip(&theTrip, p);
>
> // ALLOCATE SOME SPACE!!!!
> c = MemPtrNew(StrLen(theTrip.TripNumber)+1);
> // OK, now can copy & return
>
> StrCopy(c, theTrip.TripNumber);
> MemHandleUnlock(record);
>
> You probably *do* want to use DmQueryRecord() as it seems you're not
> modifying the record.
>
> -- John Schettino
> Palm OS Programming for Dummies: http://schettino.tripod.com/
>
> -----Original Message-----
> From: Timothy Astle [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, April 13, 2000 11:24 AM
> To: Palm Developer Forum
> Subject: Bewildered...
>
>
> CharPtr GetTripTripNumber(UInt UniqueID)
> {
> CharPtr c;
> tblTrip theTrip;
>
> VoidHand record = DmGetRecord(gTripDB, UniqueID);
> tblPackedTripPtr p = MemHandleLock(record);
> UnpackTrip(&theTrip, p);
> StrCopy(c, theTrip.TripNumber);
> MemHandleUnlock(record);
>
> return(c);
> }
>
>
> This function has been causing me much grief :-) Here's what I've
> encountered thus far:
>
> #1 It warns me that I should initialize CharPtr c before using it. (why??)
> #2 When I use DmGetRecord, I get an "Index out of Range" error, requiring
a
> hard boot
> #3 If I change DmGetRecord to DmQueryRecord, and comment out all the other
> code, I get a different error. (NULL based error, probably due to the
fact
> I hard coded a NULL for a return value :-)
>
> Now, I've heard something about clearing the busy bit... perhaps this has
> something to do with my problem? I am aware that DmQueryRecord doesn't
set
> the busy bit...
>
> Tim
>
>
>
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>
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