At 11:04 AM 02/25/2001 -0800, Ken wrote:
>One minor nit. Once you've called FldSetTextHandle, the field code
>effectively "owns" the handle. Thus you should avoid messing with the
>handle following this call, which means that the unlock should happen
>before you call FldSetTextHandle.
Good suggestion, thanks. I'm wondering about something else:
I have two fields on a frmDoDialog form being written to from a
database. The fields are set to be non-editable, as I am wanting to only
display the contents. Problems is this: I can tap the field and
backspace. When doing this, PalmOS issues a fatal error from the MemoryMgr.
I thought it was due to something as above, but I'm afraid it's
different. I would appreciate some analysis of the problem.
TIA.
My concern are the two lines below, as they are never unlocked in the code:
listStudentName[itemNum] = (Char*)MemHandleLock(MemHandleNew ( StrLen(
item->name ) + 1 ) );
listGender[itemNum] = (Char*)MemHandleLock(MemHandleNew ( StrLen(
item->gender ) + 1) );
Here's a larger snippet:
h = DmGetRecord(gDBstudent, itemNum);
/* If the selected item is found */
if (h)
{
/* A packed item must be locked */
pitem = MemHandleLock(h);
UnPackRecord ( item, pitem );
/* Let listName and listGender point to the
allocated *
* memory for the items name and gender number */
listStudentName[itemNum] =
(Char*)MemHandleLock(MemHandleNew ( StrLen( item->name ) + 1 ) );
listGender[itemNum] =
(Char*)MemHandleLock(MemHandleNew ( StrLen( item->gender ) + 1) );
if ( listStudentName[itemNum] && listGender[itemNum]){
StrCopy ( listStudentName[itemNum],
item->name );
StrCopy ( listGender[itemNum], item->gender );
}
name = listStudentName[itemNum];
gender = listGender[itemNum];
/* Load and initialize frmShowStudent */
form = FrmInitForm(frmShowStudent);
FrmSetActiveForm(form);
/* Let FldPtr point to the field "fldStudent" in
frmShowStudent*/
fldPtr = FrmGetObjectPtr(form,
FrmGetObjectIndex(form, fldStudent));
FldSetTextPtr(fldPtr, name);
/* Let FldPtr point to the field "fldGender"
(noneditable) in frmView */
fldPtr = FrmGetObjectPtr(form,
FrmGetObjectIndex(form, fldGender));
FldSetTextPtr(fldPtr, gender);
buttonTapped = FrmDoDialog(form);
/* Determine which button is tapped, and do
whatever the user wants */
if ( buttonTapped == cmdClose)
{
/* When the user taps the OK button,
release the record */
DmReleaseRecord(gDBstudent, itemNum, false);
MemHandleUnlock(h);
}
else if (buttonTapped == cmdDeleteItem )
{
if ( FrmCustomAlert(alDelete, name, NULL,
NULL) == 0 )
{
DmRemoveRecord(gDBstudent, itemNum);
}
else
{
DmReleaseRecord(gDBstudent,
itemNum, false);
MemHandleUnlock(h);
}
}
}
}
[rb}
http://www.randybrown.net
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