In a simple form, I set the text of a field as in the code below. On the
emulator, if I enter "abc" into that field and then press backspace, I get
the error message "...has just read from low memory". There are no other
bad effects, and it only happens once. From then on, unless I exit my
application and restart it, the problem does not recur.
I've ignored this problem for years, partly because it used to happen even
in the find dialog. But now I'd like to solve it. Does anyone see what's
wrong? Thanks!
(POSE 3.0a4, Palm OS 3.0).
void SetFieldText( FormPtr formP, Word fieldID, CharPtr strP, BOOL bDrawIt )
{
Handle oldTxtH;
Handle txtH;
CharPtr txtP;
FieldPtr fldP;
Boolean fieldWasEditable;
// get some space in which to stash the string.
txtH = (Handle) MemHandleNew( StrLen( strP ) + 1 );
txtP = (CharPtr) MemHandleLock( txtH );
// copy the string.
StrCopy( txtP, strP );
// unlock the string handle.
MemHandleUnlock( txtH );
txtP = 0;
// get the field and the field's current text handle.
fldP = GetFieldPointer( formP, fieldID );
oldTxtH = FldGetTextHandle( fldP );
// set the field's text to the new text.
fieldWasEditable = fldP->attr.editable;
fldP->attr.editable = true;
FldSetTextHandle( fldP, txtH );
if (bDrawIt)
FldDrawField( fldP );
fldP->attr.editable = fieldWasEditable;
// free the handle AFTER we call FldSetTextHandle().
if ( oldTxtH != NULL )
MemHandleFree( oldTxtH );
}
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