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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