[fpc-devel] THandle and 64bit platforms

[Michael Van Canneyt]

On Tue, 21 Dec 2004, Florian Klaempfl wrote:

> Peter Vreman wrote:
>
> >>>That said, the RTL should also avoid confusion with the Windows/Delphi
> >>>THandle type, and introduce a cross-platform and opaque TFileHandle
> >>>type.
> >>
> >>It's text/file/file of in pascal ;)
> >>
> >>
> >>>Which will happen to be equal to THandle on 32-bit windows.
> >>>On 32-bit Linux, the definition of THandle will then also equal
> >>>TFileHandle.
> >>>
> >>>This will also take some work :-)
> >>
> >>I guess this is no solution. It makes porting delphi apps very hard.
> >>What's the problem if thandle is 64 bit on 64 bit systems? You can still
> >>store a 32 bit file handle in it.
> >
> >
> > It'll give a lot of Warnings when compiling the sources. And there is a
> > risk for rangecheck errors.
> >
> > I checked Kylix, there THandle=longword which is also incompatible with
> > our THandle=longint under Linux.
> >
> > My proposal is to rename the current THandle to TFileHandle. And add an
> > platform independent type "THandle=PtrUInt".
> > Note that this can still cause range check errors under Unix, because
> > invalid filedescriptors have (normally) value -1.
>
> Sounds good to me.

If we rename THandle to TFileHandle then we should use it where needed,
so we don't get any range check errors.

Michael.