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Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ihnp4!alberta!sask!lowey
From: lowey@sask.UUCP
Newsgroups: comp.lang.pascal,comp.sys.ibm.pc
Subject: HELP-Read only files from Turbo Pascal
Message-ID: <760@sask.UUCP>
Date: Wed, 3-Jun-87 21:43:46 EDT
Article-I.D.: sask.760
Posted: Wed Jun  3 21:43:46 1987
Date-Received: Sat, 6-Jun-87 05:45:58 EDT
Organization: University of Saskatchewan
Lines: 34
Keywords: turbo pascal bugs read-only
Xref: utgpu comp.lang.pascal:143 comp.sys.ibm.pc:4011


Hi, 

  I have a problem that I hope someone can help me with.

  I'm trying to write a Turbo Pascal program to work on Local Area Networks.
This program needs to access files stored on the network.  For security
reasons these files are marked READ ONLY.

  The problem is that Turbo Pascal won't see a file if it is marked as
read only.  Logically what it should do is open a file ok, allow you to
read from the file, then give IO error number 03: "File not open for output"
if the program tries to write to the file.  Instead, I get IO error 01:
"File does not exist" when I attempt to RESET the file.

  I assume the problem occurs because Turbo version 3.01A (which I'm using)
was written for MS-DOS 2.0, which did not have file locking capabilites.
This implies that I have to use MS-DOS 3.0 or higher function calls to open 
the files.   The trick is opening the files in such a way that I can use the
Turbo Pascal READ and READLN procedures to get information from the files.

  Has anyone run into this problem before, and more important, does anyone 
have a solution?

Many Thanks.

______________________________________________________________________________
| Kevin Lowey                    |The above is the personal opinion of Kevin |
| University of Saskatchewan     |Lowey.  It does not reflect the position of|
| Computing Services             |the University of Saskatchewan in any way. |
| SaskTel: (306) 966-4826        |                                           |
| Bitnet:LOWEY@SASK. (preferred) |I am in no way affiliated with any of the  |
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