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NewYorker
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 Posted: Thu Mar 04, 2004 3:52 am Post subject: system command |
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Hi,
I'm looking for code to do the following. Bascially, "System" shell out and
execute the command and return the stdout in result. You know a link OR
know the trick, please let me know.
// result contains the stdout of the command
char* result=System("ls -l");
char* result=System("cat myFile.txt");
TIA.
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Victor Bazarov
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| Posted: Thu Mar 04, 2004 4:08 am Post subject: Re: system command |
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"NewYorker" <newyorker777 (AT) hotmail (DOT) com> wrote...
| Quote: | I'm looking for code to do the following. Bascially, "System" shell out
and
execute the command and return the stdout in result. You know a link OR
know the trick, please let me know.
// result contains the stdout of the command
char* result=System("ls -l");
char* result=System("cat myFile.txt");
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No, that is not possible in Standard C++. You need POSIX pipes to do
what you want. Off-topic here, sorry.
V
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Jack Klein
Guest
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| Posted: Thu Mar 04, 2004 4:08 am Post subject: Re: system command |
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On Wed, 3 Mar 2004 21:52:52 -0600, "NewYorker"
<newyorker777 (AT) hotmail (DOT) com> wrote in comp.lang.c++:
| Quote: | Hi,
I'm looking for code to do the following. Bascially, "System" shell out and
execute the command and return the stdout in result. You know a link OR
know the trick, please let me know.
// result contains the stdout of the command
char* result=System("ls -l");
char* result=System("cat myFile.txt");
TIA.
|
There is no way to do this in the standard C++ language. Typically
you build a command line that includes your operating system's output
redirection option to send the stdout of a program to a file. Then
you can open and read the file.
Your compiler and operating system combination might offer extensions
for doing this differently, but you would have to ask about in a group
supporting that combination. We don't do extensions here.
--
Jack Klein
Home: http://JK-Technology.Com
FAQs for
comp.lang.c http://www.eskimo.com/~scs/C-faq/top.html
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alt.comp.lang.learn.c-c++
http://www.contrib.andrew.cmu.edu/~ajo/docs/FAQ-acllc.html
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Emanuel Ziegler
Guest
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| Posted: Thu Mar 04, 2004 10:57 am Post subject: Re: system command |
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Victor Bazarov wrote:
| Quote: | "NewYorker" <newyorker777 (AT) hotmail (DOT) com> wrote...
You know a link OR know the trick, please let me know.
No, that is not possible in Standard C++. You need POSIX pipes to do
what you want. Off-topic here, sorry.
|
ACK
Try http://pstreams.sourceforge.net/
There you can get a header file, that defines stream classes for piping. It
works on linux machines without problems. You simply define something like
--- source begins here ---
#include <iostream>
#include "pstream.h"
using namespace std;
int main () {
redi::ipstream foo("ls -l");
char buffer[100];
while ( foo ) {
foo.getline(buffer,100);
cout << "Redi: " << buffer << endl;
}
}
--- source begins here ---
This program simply puts the word "Redi: " in front of every line.
You can access foo exactly like cin or any ifstream object. The class
redi::opstream does the same with output streams.
HTH
Emanuel
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Buster
Guest
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| Posted: Thu Mar 04, 2004 12:46 pm Post subject: Re: system command |
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Emanuel Ziegler wrote:
| Quote: | #include <iostream
#include "pstream.h"
using namespace std;
int main () {
redi::ipstream foo("ls -l");
char buffer[100];
while ( foo ) {
foo.getline(buffer,100);
cout << "Redi: " << buffer << endl;
}
}
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See the FAQ for an explanation of why this code will output the final
line twice. I would also use getline from the standard
to avoid the fixed-size character buffer.
Regards,
Buster.
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