"Eliah NInyo" <[EMAIL PROTECTED]> wrote in message
news:34007@palm-dev-forum...
>
> hello,
>
> i want to ask if any1 know of a function that return a CharPtr value from
a
> given handle valuse.
>
> i mean i have a handle to one of my memory allocations (handle to a record
> field - with MemHandleNew) and i get a pointer to this handle (with
> MemHandleLock). i copy some text to this pointer by StrCopy and than i
> unlock the poiter (with MemPtrUnlock).
>
> later in the same code function i need to use the text i entered to the
> poiter (of the handle) to be the text of one of my controle resources (
> withe CtlSetLabel ) and i want to know if there is a function that i can
use
> to get the text i put in my handle to be a CharPtr value????
Its called pointer casting... MemHandleLock does two things:
1) It prevents the memory associated with the handle from being moved by the
OS.
2) It returns a void pointer to that locked region.
You can then turn the void pointer into a Char pointer for use with
functions like CtlSetLabel.
Char *pc = (Char *) MemHandleLock(handle);
CtlSetLabel(ctl, pc);
You will need to leave the handle locked until the control has its label
changed or until it is no longer displayed, because you can't be sure when
the PalmOS will need to redraw the control, especially with 3.5 and later
versions which use redraws more often than in the past.
--
Ben Combee
Veriprise Wireless <http://www.veriprise.com>
--
For information on using the Palm Developer Forums, or to unsubscribe, please see
http://www.palmos.com/dev/tech/support/forums/
