Thank you much, Robert.
--- Robert McKenzie <[EMAIL PROTECTED]>
wrote:
> christy-
>
> You need to actually get the record and check for
> equality. i.e.
>
> /* use DmFindSortPosition here, passing it (amongst
> other things), &index *.
>
> Boolean foundIt = false;
> // guard against no match whilst sorting first
> if (index > 0)
> {
> MemHandle h = DmQueryRecord(pDb, --index);
> if (h)
> {
> MemPtr p = MemHandleLock(h);
> foundIt = CompareIDFunc(p, &findRecord) == 0;
> MemHanleUnlock(h);
> }
> }
>
> if (foundIt)
> {
> /* do whatever you want here */
> }
>
>
> -----Original Message-----
> From: christy [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, December 17, 2002 3:17 PM
> To: Palm Developer Forum
> Subject: RE: DmFindSortPosition question
>
>
> Very good point. I modified the code to have the two
> variables compare against each other.
>
> I need to find a matching record from the databse
> (by
> fid and sid pair). If there is a match, I can
> subtract
> 1 from the return-value of DmFindSortPosition.
> However, how do I know that there is in fact no
> match
> for fid + sid pair? DmFindSortPosition tells me the
> next available position. It didn't indicate whether
> or
> not a match is found. Am I using the wrong function
> all together?
>
> --- Robert McKenzie <[EMAIL PROTECTED]>
> wrote:
> > Just a guess, but because of possible wrapping /
> > overflow problems, it is always safer to compare
> two
> > values with each other rather than to subtract
> them
> > and compare with 0.
> >
> > I.e.
> > if (p1->fid < p2->fid) is better than if
> ((p1->fid
> > - p2->fid) < 0)
> >
>
> __________________________________________________
> Do you Yahoo!?
> Yahoo! Mail Plus - Powerful. Affordable. Sign up
> now.
> http://mailplus.yahoo.com
>
> --
> For information on using the Palm Developer Forums,
> or to unsubscribe, please see
> http://www.palmos.com/dev/support/forums/
>
>
> --
> For information on using the Palm Developer Forums,
> or to unsubscribe, please see
http://www.palmos.com/dev/support/forums/
__________________________________________________
Do you Yahoo!?
Yahoo! Mail Plus - Powerful. Affordable. Sign up now.
http://mailplus.yahoo.com
--
For information on using the Palm Developer Forums, or to unsubscribe, please see
http://www.palmos.com/dev/support/forums/
