You need to allocate space for your CharPtr using pname = MemPtrNew (xx),
where xx is the size you want to allocate. Right now, you don't have any
space allocated to receive the string, thus the bus error.
Regards,
Steve
> -----Original Message-----
> From: Nielsen, Jimmy Selgen [mailto:[EMAIL PROTECTED]]
> Sent: Friday, February 18, 2000 11:58 AM
> To: Palm Developer Forum
> Subject: Dynamic popup list weirdness (long)
>
>
> > Hi... i'm having a lot of trouble with a dynamic popup list...
> >
> > When i start up my app, everything looks fine... and all
> the elements are
> > in the list... but when i select an element from the list,
> POSE tells me
> > that i've just read from low memory. and after that the app
> dies with a
> > bus error!...
> >
> > I've tried to crop my eventhandling down to frmOpenEvent
> only, and it
> > still dies....
> >
> > Here is the code i use for drawing the list :
> >
> > void ProjectListDrawFunction(UInt itemNum,RectanglePtr
> bounds,CharPtr
> > pUnused)
> > {
> > project_rec prec;
> > DBOpen();
> > if(GetProjectRec(itemNum,&prec)!=-1)
> > {
> >
> >
> WinDrawChars(prec.Name,StrLen(prec.Name),bounds->topLeft.x,bou
> nds->topLeft
> > .y);
> > }
> > else
> > WinDrawChars("Error getting project
> name",StrLen("Error getting
> > project name"),bounds->topLeft.x,bounds->topLeft.y);
> > DBClose();
> > }
> >
> > and here is the code i go through in the eventhandler (shorted) :
> > ListPtr
> lptr=GetObjectPtr(FrmGetActiveForm(),ProjectList);
> > if(lptr!=NULL)
> > {
> > Word sel=LstGetSelection(lptr);
> > if(sel!=noListSelection)
> > {
> > CharPtr pname=LstGetSelectionText(lptr,sel);
> > }
> > }
> >
> >
> > I know from debugging with gdb, that the point where it dies is at
> > LstGetSelectionText
> > here are the values of the variables at runtime :
> >
> > *lptr
> > (gdb) print *lptr
> > $1 = {id = 5002, bounds = {topLeft = {x = 1, y = 18},
> extent = {x = 156,
> > y = 33}}, attr = {usable = 0, enabled = 1, visible =
> 0, poppedUp =
> > 0,
> > hasScrollBar = 0, search = 0, reserved = 0}, itemsText = 0x0,
> > numItems = 1, currentItem = 0, topItem = 0, font =
> stdFont, popupWin =
> > 0x0,
> > drawItemsCallback = 0x1001b400 <ProjectListDrawFunction>}
> >
> > sel
> > (gdb) print sel
> > $2 = 0
> >
> > pname
> > (gdb) print pname
> > $3 = 0x4 ""
> >
> >
> > Could someone please try to guide me in the rigth direction
> here....
> >
> > Jimmy
>
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