Thanks Keith for correcting my error. I guess this should be a lesson for
everyone: If I (or someone else) says "I haven't tested this, but..." you
my want to take what I (or they) say "with a grain of salt". I think that
was my second error, if anybody's counting. :)
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: "Palm Developer Forum" <[EMAIL PROTECTED]>
Sent: Wednesday, December 13, 2000 8:32 PM
Subject: Re: Problem in MemoryMgr.c...when performing a FldDelete
>
>
> Richard,
>
> You're correct in your description of the second and third parameters, but
> incorrect in their application. According to you, FldDelete(txtPtr, 0, 0)
would
> delete 1 character. That is, if (0, 2) deletes 3 characters, then (0, 1)
would
> delete 2 characters, and so (0, 0) would delete 1 character. However, (0,
0)
> actually doesn't delete any. See the Palm OS API documentation,
especially
> where it says:
>
> This function deletes all characters from the starting offset up to
the
> ending offset and sets the field's dirty attribute. It does not
delete
> the character at the ending offset.
>
> Therefore, the "+ 1" is necessary.
>
> -- Keith Rollin
> -- Palm OS Emulator engineer
>
>
>
>
>
>
> "Richard Burmeister" <[EMAIL PROTECTED]> on 12/13/2000 05:59:35 PM
>
> Please respond to "Palm Developer Forum" <[EMAIL PROTECTED]>
>
> Sent by: "Richard Burmeister" <[EMAIL PROTECTED]>
>
>
> To: "Palm Developer Forum" <[EMAIL PROTECTED]>
> cc: (Keith Rollin/US/PALM)
> Subject: Re: Problem in MemoryMgr.c...when performing a FldDelete
>
>
>
> From: "James Tu" <[EMAIL PROTECTED]>
>
> > FieldPtr debugfldP;
> > CharPtr debug_text;
> >
> > //The field is a non-editable field
> > //This Causes an error "MemoryMgr.c, Line: 4340, NULL handle" for some
> > reason!!!
> >
> > debugfldP = GetObjectPtr(MainDebugFieldField);
> > debug_text = FldGetTextPtr(debugfldP);
> > if (debug_text != NULL){
> > FldDelete(debugfldP, 0, StrLen(debug_text) + 1);
> > }
>
> The second param to FldDelete is the offset into the field's text string
of
> the start of the range, and the third param is the offset of the end of
the
> range. I haven't tested this, but I think that makes StrLen(debug_text)+1
> is too big. (E.g., to delete all of a 3 char text field, I think you
would
> use 0 and 2, not 0 and 3). Also, if your Palm supports multi-byte
> characters, you have to account for the fact that one character may take 2
> bytes.
>
>
>
>
> --
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please see http://www.palmos.com/dev/tech/support/forums/
>
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