Hello list-members!
Let's say I've a variable of type file. Is there a way to find out if it is assigned and the file is opened?
Thank's in advance,
ciao,
Olaf
Mailing lists / fpc-pascal / 2002-07
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- Olaf Leidinger 2
- Jonas Maebe 1
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Olaf Leidinger wroteLet's say I've a variable of type file. Is there a way to find out if it is assigned and the file is opened?
Not really. It's sort-of possible by copying the internal structure from the RTL and checking certain fields, but even that method isn't fool-proof (since it's possible that an uninitialized file variale "accidentally" contains valid values). You really should structure your program so that at any time, it knows in what state a certain file (or any other variable) is.
Jonas
----- Original Message -----
Earlier message 27 lines
From: "Jonas Maebe"
To:
Sent: Monday, July 22, 2002 1:03 AM
Subject: Re: [fpc-pascal]file
>
>
> On Sun, 21 Jul 2002, Olaf Leidinger wrote:
>
> > Let's say I've a variable of type file. Is there a way to find out if
> > it is assigned and the file is opened?
>
> Not really. It's sort-of possible by copying the internal structure from
> the RTL and checking certain fields, but even that method isn't fool-proof
> (since it's possible that an uninitialized file variale "accidentally"
> contains valid values). You really should structure your program so that
> at any time, it knows in what state a certain file (or any other variable)
> is.
Okay, I see...
Thank you very much.
Ciao,
Olaf