I ended up replacing my labels with non-editable, non-underlined fields. I
then wrote the following SetField() function that sets my text into the
field. This works well, as it avoids the 4.0 complaints and I don't have to
worry about overflowing the label.
extern void SetField( FormPtr pForm, UInt16 uiField, Char *szNewText )
{
FieldType * pField;
MemHandle hText;
Char *szText;
UInt16 uiNewSize;
UInt16 uiMaxChars;
// The following concept came from Reference.pdf in the discussion of
FldGetTextHandle.
pField = FrmGetObjectPtr(pForm, FrmGetObjectIndex(pForm, uiField));
uiNewSize = StrLen( szNewText ) + 1; // "+1" for null terminator
uiMaxChars = FldGetMaxChars( pField );
// Get the handle for the current string
hText = FldGetTextHandle( pField );
// If there is a handle attached to the field, free and detach it
if( hText )
{
FldSetTextHandle( pField, NULL);
MemHandleFree( hText );
}
// Allocate a new memory chunk that will contain the data.
hText = MemHandleNew( uiNewSize );
// Lock the handle and get a pointer to the memory chunk.
szText = MemHandleLock(hText );
StrNCopy(szText, szNewText, uiMaxChars);
// Unlock the new memory chunk (must be unlocked before call to
FldSetTextHandle()).
MemHandleUnlock( hText );
// Set the field's text to the data in the new memory chunk.
FldSetTextHandle(pField, hText );
// Update the text in the field.
// THIS WILL CRASH IF YOU HAVEN'T FIRST CALLED FrmDrawForm()
// (or if you have called FrmEraseForm().
FldDrawField(pField);
}
"Steve Achelis" <[EMAIL PROTECTED]> wrote in message
news:43361@palm-dev-forum...
>
> That certainly makes for some difficult to maintain code. Now I have to
go
> to every form and make sure any label that I might change programmically
has
> a long enough static string. I then have to create defines to limit the
> lengths of my strings in my code. And I have to remember that if I ever
> change the length of the defines, I have to lengthen the string in the
> forms. sick!
>
> Steve
>
> "David Fedor" <[EMAIL PROTECTED]> wrote in message
> news:43205@palm-dev-forum...
> >
> > > My app sets the text associated with a label using CtlSetLabel(). It
> > works
> > > fine on OS < 4.0. However, on 4.0 I get the following error message
> from
> > > the emulator: "...Control.c Line 543, Not a control object."
> >
> > What sort of object are you passing in to CtlSetLabel? If you're like
the
> > normal case that this message is designed to help, then you're probably
> > trying to change the text of a label object. A label object isn't a
> > control. Use FrmCopyLabel.
> >
> > CtlSetLabel used to work but that was only by luck; the routine didn't
use
> > to check its object type and the structs happened to be similar enough
in
> > this respect. But that isn't guaranteed to be the case in the future.
> >
> > -David Fedor
> > Palm Developer Support
> >
> >
>
>
>
>
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