OK, here's what it looks like to me:
This is a trigger label. That means it's probably got a pointer into the
selected value of the associated list that's currently selected, *not* a
single chunk of allocated memory for just the label. So, you should not free
the initial label buffer. Since you're going to be replacing it with one of
your own, you've correctly determined that you'll be leaking memory if you
don't free the new chunk you've set. I suggest something like this:
SetTriggerLable() {
static char *myChunk = NULL;
FormPtr formP;
ControlPtr serialP;
char *oldTextP, *newTextP;
formP = FrmGetFormPtr(SyncPrefsForm);
serialP = FrmGetObjectPtr(formP, FrmGetObjectIndex(formP,
SyncPrefsSerialNumberSelTrigger));
oldTextP = CtlGetLabel(serialP);
if (myChunk == oldTextP)
MemPtrFree(oldTextP); // only free it if it was the one I
allocated
myChunk = newTextP = MemPtrNew(whatever);
// set up newTextP as desired
CtlSetLabel(serialP, newTextP);
}
==-
John Schettino author of
Palm OS Programming For Dummies, http://schettino.tripod.com
-----Original Message-----
From: Ken Glover [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, December 08, 1999 8:33 AM
To: [EMAIL PROTECTED]
Subject: Re: How to free Label text pointer?
Thanks for the reply.
If I don't free the CharPtr that the label has, and set a new label, I get
memory leak. But if I try to free it, I get "Bad chunk header" error. Am I
making any sense?
> I think that freeing of the handle only applies to textfields. In my
> code I don't free the handle for a button label.
>
>
>
> Ken Glover wrote:
>
> > Does anyone know what the error "MemoryMgrNew.c, Line:4240, Bad chunk
> > header" mean?
> > Here's some code:
> >
> > /* free the old label text so a new one can be assigned */
> >
> > formP = FrmGetFormPtr(SyncPrefsForm);
> > serialP = FrmGetObjectPtr(formP, FrmGetObjectIndex(formP,
> > SyncPrefsSerialNumberSelTrigger));
> >
> > oldTextP = CtlGetLabel(serialP);
> > MemPtrFree(oldTextP); <-- error occurrs here
> >
> > /* end */
> >
> > Am I doing this right? I am using 33EZDebug ROM on PalmV emulator.
> > Thanks for reading this!
> >
> > Ken Glover
> > Palm Programming Group
> > Eclipse Inc.
> > www.eclipseinc.com
>
>
