Thread: [Dev-C++] capture command line output

I have a GUI program that calls on another command line program to perform a 
task on a file, but how do i capture the results of the command line output 
so that i can use it in my GUI and display it to the user?

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Noorez Kassam wrote:

> I have a GUI program that calls on another command line program to 
> perform a task on a file, but how do i capture the results of the 
> command line output so that i can use it in my GUI and display it to 
> the user?
>
>
man popen
or
google popen

Hi Noorez,
 
This is a case of redirecting cout (stdout) and/or cerr (stderr) to an input stream.  This is something I've never tried, to be honest.

A simple way would be to output redirect (>) the output of the command line program to a temporary text file, then import and display the text file in your GUI, deleting the text file after capture.
 
BTW: insight.exe probably uses this capability, as it's actually a GUI shell for GDB.  So it's source may be helpful.
 
Also see:
http://forum.java.sun.com/thread.jspa?threadID=535799&messageID=2596130
http://www.cplusplus.com/ref/iostream/ios/rdbuf.html
http://lists.boost.org/Archives/boost/2005/01/78560.php ***!!!***

Noorez Kassam <lor...@ho...> wrote:
I have a GUI program that calls on another command line program to perform a 
task on a file, but how do i capture the results of the command line output 
so that i can use it in my GUI and display it to the user?
<snip>



Alfred P. Reaud
 

Noorez Kassam wrote:

> I have a GUI program that calls on another command line program to 
> perform a task on a file, but how do i capture the results of the 
> command line output so that i can use it in my GUI and display it to 
> the user?

simplistic example...


$cat popentst.c
#include <stdio.h>
#include <stdlib.h>

main()
{
        char *cmd = "/usr/bin/ls *.c";
        char buf[BUFSIZ]; /* BUFSIZ is declared in my stdio.h to be 1024 */
        FILE *ptr;
        if ((ptr = popen(cmd, "r")) != NULL)
                while (fgets(buf, BUFSIZ, ptr) != NULL)
                        (void) printf("%s", buf);
                (void) pclose(ptr);
        return 0;
}