Aw: Re: REL file oddity...

From: André Fachat <*afachat_at_gmx.de*> Date: Mon, 3 Jun 2013 19:03:02 +0200 (CEST) Message-ID: <trinity-4b165ec1-2938-4ca8-8c62-3f3a6d3445d2-1370278982751@3capp-gmx-bs50> · afachat_at_gmx.de

Hi Greg,

of course you are totally right - how embarrassing! ;-) 

> Von: "Greg King" <greg.king5@verizon.net>
>> Just do an OPEN"FILE,L,"+chr$(n); and, then a CLOSE -- the directory
>> keeps being empty.
>> https://plus.google.com/u/0/108561624393340605896/posts/DyBxy6wsXMJ
>
> Your program reuses the "d" variable! First, it's the device number; then,
> it's the sector number (in the error message). So, only the first open
> actually talks to the drive -- the others open a REL file on the keyboard!
> ;-)

Of course it was not the fault of the DOS, but mine - as pointed out, I am reusing the "d" variable and
after fixing this, the DOS behaves as it should!

But what do I learn from this:
1) after long years of programming C, Java, and even structured assembler I am really used to scope and protection of local variables
2) do more reuse, even if such a small routine like reading the error channel - in another test program I had already found and corrected this error.
3) Peer review to the rescue :-)

Thanks for finding this!
André

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