How do i do this?

[iphitus]

I've found a python implementation of this.

http://python.org/doc/current/lib/module-commands.html

 

But i'm looking for a way to do this in kylix(c++).

 

I want to run a command line command. Eg "mpg123 /home/james/music/abc123.mp3"

 

I can do this in python with:

import commands

commands.getoutput('/usr/bin/mpg123 /home/james/music/abc123.mp3')

 

Any ideas?

 

James[/code]

[tyme]

i seem to remember a function called system ......it's been 2 years since I've done any C++ so...my memory could be wrong.

[johnnyv]

system() sounds about right.

 

type "man system" in a terminal or man:/system in kounquer

 

also have a look at "exec" and "fork" enjoy.

[iphitus]

Nup didn't work, though johnnyv thanks for the bash ways.

 

i tried

system("/usr/bin/xmms");

 

This didn't work either.

system("xmms");

 

They compiled, but it didn't work.

XMMS didn't run. Yes that's where XMMS is located. What do i do?

[Glitz]

If Kylix is anything like BC5 then you should try consulting the help system. It should tell you how to use the system() function as well as show you all related functions.

 

Glitz.

[johnnyv]

Nup didn't work, though johnnyv thanks for the bash ways.

 

i tried 

system("/usr/bin/xmms");

 

This didn't work either.

system("xmms");

 

They compiled, but it didn't work.

XMMS didn't run. Yes that's where XMMS is located. What do i do?

 

Strange i just did this:

#include <stdlib.h>

#include <iostream.h>



int main()

{

if(system("et"))

{

cout<<"Program executed"<<endl;

}

else

{

cout<<"Program failed to  execute"<<endl;

}

return 0;

}

g++ system_test.cpp -o test

 

on running ./test

 

Enemyterritory started up fine

so i quite et and it printed "Program failed to execute" :roll:

Obviously i don't know what im doing, but system does open programs.

[johnnyv]

Ok it looks like it returns 0 on success and something else on failure

 

#include <stdlib.h>

#include <iostream.h>

int value;



int main()

{

value = system("et");

cout<<"system returned "<<value<<endl;

return 0;

}

 

changing "et" to "frog" gives

[john@bob c++]$ ./test

sh: line 1: frog: command not found

system returned 32512

[john@bob c++]$

 

so it looks like system works as advertised.

[static]

Wouldn't it need to return a 0 to print out Program Exec Failed in your 2nd to last post?

[tyme]

Wouldn't it need to return a 0 to print out Program Exec Failed in your 2nd to last post?

yes, the program (et) would have to return a 1 to get the "program executed" message, or a 0 for "program failed to execute". I don't think et would be returning either a 1 or a 0 ;-) because it's not expecting to have to give a boolean response to any program. in essence, the if/else statement he has just doesn't work...

[johnnyv]

Wouldn't it need to return a 0 to print out Program Exec Failed in your 2nd to last post?

yes, the program (et) would have to return a 1 to get the "program executed" message, or a 0 for "program failed to execute". I don't think et would be returning either a 1 or a 0 ;-) because it's not expecting to have to give a boolean response to any program. in essence, the if/else statement he has just doesn't work...

 

I realised that.

 

I didn't read the system() function def untill after i was expecting it to give a 1 on success which was not the case.

I also did not expect et to return anything i expected the function that called et to return a value as most functions do.

 

system(NULL);

returns 1

system("");

returns 0

 

so it seems to give 0 on success unless you put "" as the argument which also gives 0