[fpc-pascal] THandle in code that must compile also with Delphi
Virgo Pärna
virgo.parna at mail.ee
Thu Mar 20 14:25:05 CET 2014
On Thu, 20 Mar 2014 13:02:28 +0100 (CET), Michael Van Canneyt <michael at freepascal.org> wrote:
>
> Shortly said: No. The Delphi API is wrong; It should also return THandle
> (as that is what Windows CreateFile returns), but probably for historical
> reasons they still use Integer.
> With the advent of 64-bit delphi, they could have cleaned up their API, but Alas...
>
I did try googling and it appears, that in 64 bit Delphi XE2 uses THandle
as a result type. Anyway, in the case of error, it returns INVALID_HANDLE_VALUE,
which is DWORD(-1).
So, under Windows it would be possible to use same code, if you compare result
against INVALID_HANDLE_VALUE. And you should be able safely cast return value to
THandle for that (and use variable of that type).
I really don't know, how it would work on linux, because sys_open seems to return
int there.
--
Virgo Pärna
virgo.parna at mail.ee
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