"Remo Hofer" <[EMAIL PROTECTED]> wrote in message
news:38660@palm-dev-forum...
>
> Could you please comment the following function:
>
> void UpdateControl(FormPtr f, UInt16 id, Char * s) {
> ControlType *ctl;
> Char *label;
>
> ctl = FrmGetObjectPtr(f, FrmGetObjectIndex(f, id));
> label = (Char *) CtlGetLabel(ctl);
> StrCopy(label, s);
> CtlSetLabel(ctl, label);
> }
>
> It does update the label of a control (selector, popup, button) by copying
> the new string to the old location (similar to FrmCopyLabel with labels).
> Of course the new string must not be longer than the old one. But are
> there any other problems? Perhaps with the direction PalmOS 5 will go? The
> function assumes that the memory location of the old label is writeable.
> Will this assumption still be correct for PalmOS 5?
Hmmm... this technique seems to be what CtlCopyLabel would be if it were
implemented. The biggest issue I'd have with this is that it will fail if
the control's label has been changed to point to a read-only string, such as
a PC-relative string in the data segment or a string in a locked database
record. Your assuming that the string returned is going to be in a writable
area of memory, which isn't necessarily true.
--
Ben Combee
Veriprise Wireless <http://www.veriprise.com>
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