[DUG] Is it a bug in latest version of Delphi?

[Kyley Harris]

the fact that it behaves different under delphi 7 and Delphi 2007 on the
same machine implies that there is some strange mystery at work in the
compiled code that is not obvious. its not a direct problem of the
underlying windows API.

As to using the GetLastError..

There is issue I have with relying on that rather than the -1. The MSDN
documentation states that not all routines need to or are required to call
SetLastError(0) on success, and only set it on failure. the value -1 is what
you are supposed to analyze to determine IF you should check GetLastError.
GetLastError is not the first test. Clearly microsoft does not intend the
storage to be used for negative values even if some appear to work.

if you rely on GetLastError rather than the -1. you may get a true value of
"3" but getlasterror was not reset from some other call and you can get a
false fail.



On Tue, Feb 16, 2010 at 4:55 PM, Karl Reynolds <kreynolds at chocfishsoft.co.nz
> wrote:

> On Tue, Feb 16, 2010 at 4:43 PM, Kyley Harris <Kyley at harrissoftware.com>
> wrote:
> > I'll add my cents..
> > under Delphi 7, getlasterror returns error 1413 as Karl said.. under
> Delphi
> > 2007 no errors whatsoever. whats clear is that Getlasterror is
> unlreliable
> > in this situation as Microsoft says, because microsoft online help says
> the
> > getlasterror value cannot be controlled depending on OS and device and
> only
> > the -1 is reliable as an answer.
>
> Except that -1 isn't reliable because, as already discussed, it could
> be a valid data value. I would in fact expect the code returned to
> vary by OS and device (and that's what RaiseLastOSError is for) but I
> really didn't expect there to be an OS or device on which an
> LB_GETITEMDATA request out of the range of the listbox wasn't an
> error! Evidently I'm too trusting or something.
>
> Under the circumstances, checking the bounds first seems necessary.
>
> Cheers,
> Karl
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-- 
Kyley Harris
Harris Software
+64-21-671-821
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