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Message-ID: <E3725E2B7548D51192090002A534A18A3368EC@s2-vic-r1.nrn.nrcan.gc.ca>
From: "Murdoch, Matthew" <mmurdoch AT PFC DOT Forestry DOT CA>
To: "'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject: Re: System Calls
Date: Wed, 7 Aug 2002 11:56:45 -0400 
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	charset="ISO-8859-1"

I am trying to make a system call using the system function in C.  I have an
executable program that requires at input text file and I want to put the
output in a text file.   I cannot seem to get the system function to work.
I have tried the following:

system ("/cygdrive/c/users/mmurdoch/ACE/sixs \
           < /cygdrive/c/users/mmurdoch/ACE/sixSIn.txt \
	   > /cygdrive/c/users/mmurdoch/ACE/sixSOut.txt")

and I have also tried

system("cmd /c c:\users\mmurdoch\ACE\sixs < c:\users\mmurdoch\ACE\sixSIn.txt
> c:\users\mmurdoch\ACE\sixSOut.txt);
- I have also tried it without the "cmd /c"

When I try to run either one the sixSOut.txt file is not produced.  I am not
sure if the system command is working and simply
not piping the output to a text file or if is not working at all.  When I
call my C program I do not get any errors and it seems to run okay.

I also have the same problem when I am trying to call the "ls" command.  I
am trying to get a directory listing and store that listing in a text file.
I am trying to use the following command

           system("ls c:\users\mmurdoch\ACE\
>c:\users\mmurdoch\ACE\dirlist.txt);

I have also tried adding the "command /c" at the beginning of the above
statement.

Any help would be appreciated.

Matthew Murdoch


Below is my previous message

> Hi list,
> 
> I am fairly new to cygwin I have a fairly trivial question.  I am trying
to
> make a system call using the system function in C.   I have read some of
the
> previous postings on the newsgroup, but I am still stuck.   I am trying to
> do the following command, which calls an executable file and supplies it
> with an input file.  It then pipes the output to an otuput file.   
> 
> system("cmd /c c:\"users\"mmurdoch\"ACE\"sixs <
> c:\"users\"mmurdoch\"ACE\"sixSIn.txt
>          > c:\"users\"mmurdoch\"ACE\"sixSOut.txt");
> 
> I do have the "sh.exe" file in my \bin directory.    
> 
> Thanks in advance for the help

What exact error do you see?  "I have a problem" isn't helpful
at all.

What are these \" ?  Don't you mean \\ ?
Why are you running cmd to call the application?  Why not call it
directly:

  system ("/cygdrive/c/users/mmurdoch/ACE/sixs \
           < /cygdrive/c/users/mmurdoch/ACE/sixSIn.txt \
	   > /cygdrive/c/users/mmurdoch/ACE/sixSOut.txt")

?

Or write a shell script and call that?

Corinna


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