"lklee" <[EMAIL PROTECTED]> writes:
> I am using the follow function to set an text to an Field But that always
> return, is there anyone who can help me to solve it.
>
> static void SetField( FormPtr frmP, unsigned short field_id, char *text )
> {
> // Set the associated field's text
> FieldPtr fld = (FieldPtr)GetObjectPtr( frmP, field_id ) ;
> Handle h = FldGetTextHandle( fld );
There is no guarantee that the field will have a valid text handle. You
should check for h==NULL and allocate a handle if so.
> StrCopy( (CharPtr)MemHandleLock( h ), text );
Even if h has a handle, there's no guarantee that it is big enough to
hold text. You should still allocate a new handle and destroy the old
one.
Here is a better approach:
static void SetField( FormPtr frmP, unsigned short field_id, char *text )
{
// Set the associated field's text
FieldPtr fld = (FieldPtr)GetObjectPtr( frmP, field_id ) ;
Handle h = FldGetTextHandle( fld );
FldSetTextHandle( fld, NULL );
if (h) MemHandleFree(h);
h = MemHandleNew( StrLen(text) + 1 );
StrCopy( MemHandleLock( h ), text );
FldSetTextHandle( fld, h );
FldDrawField( fld );
}
--
Dave Carrigan ([EMAIL PROTECTED]) | YOW!! Up ahead! It's a DONUT
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Seattle, WA, USA |
http://www.rudedog.org/ |
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