How to call an external exceutable program.
 

Hi,

I have to call an external executable program (prog2) from within my program (prog1) and then use the output of that exceutable program (prog2) in program (prog1) after calling it.

I have to manipulate the output obtained from progam (prog2) in program (prog1) and then perform this iteration n times.

I do not how to do this. Please let me know.

Thanks

Re: How to call an external exceutable program.
 

look into pipes

Chris

Re: How to call an external exceutable program.
 

Hi,

Could you give a small example.

Thanks

Re: How to call an external exceutable program.
 

/* ************************************* */

/* Function To Run A Shell Command, And  */

/* Read The Output Back Into Our Program */

/* ************************************* */

std::string run_command(string cmd)

{

        string data;

        FILE *stream;

        char buffer[1024];



        // Open The Command With Read Flag  

        stream = popen(cmd.c_str(), "r");

        while (fgets(buffer, 1024, stream) != NULL) {

                data.append(buffer);

        }

        pclose(stream);



        return data;

}

Usage Case:

// Find Running SSH Daemons In Linux

std::string grepvals = run_command("ps aux | grep \"sshd\"");

Re: How to call an external exceutable program.
 

Hi,

Thanks for the sample code. If possible could you also refer me a book or article online where i can read more about it.