Why using STATIC variable for the label text? If CtlGetLabel() returns a
pointer to the label text, I should be able to get the text whenever I
want. Right?
-Elizabeth
Igor Mozolevsky
<[EMAIL PROTECTED]> To: Palm Developer
Forum
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<[EMAIL PROTECTED]>
bounce-palm-dev-forum-8072@news. cc:
palmos.com Subject: RE: Question
on CtlGetLabel()
08/07/01 05:38 PM
Please respond to Palm Developer
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--On 07 August 2001 16:34 -0700 [EMAIL PROTECTED] wrote:
>
> No. I was trying to get the label text from a Selector control and save
> it to a char* variable. Here is a copy of the comments from the API
> Reference documentation about using CtlSetLabel...
>
> This function stores the newLabel pointer in the control's data
structure.
> It doesn't make a copy of the string that is passed in.
> Therefore, if you use CtlSetLabel, you must manage the string yourself.
> You must ensure that it persists for as long as it is being displayed
> (that is, for as long as the control is displayed or until you call
> CtlSetLabel with a new string), and you must free the string after it is
> no longer in use (typically after the form containing the control is
> freed).
> If you never use CtlSetLabel, you do not need to worry about freeing a
> control's label.
>
> Can you send me lines of code to do a CtlSetLabel() and save the label to
> a char* variable using the string handle returned from CtrGetLabel()?
{
// MAKE SURE THEY ARE STATIC!!!
static Char *newLabel;
static Char *oldLabel;
oldLabel = CtlGetLabel(...); // If you really need it...
newLabel = MemPtrNew(StrLen(newLabelText)+1);
StrCopy(newLabel, newLablelText);
CtlSetLabel(...newLabel); // NB: new label should not be longer that old
label
// Vola!!!
}
There are a few possible memory leaks in the above code, I couldn't be
bothered to insert the whole lot. There is a way of cleaning up from the
same function after you're done with the form... Keep that as an exercise
to the reader :-)
IM :-)
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