Passing a value from a c++ Executable to a Script

[superman21]

Hope you guys can help. Im trying to make an email option for a program im writing. The program is a c++ executable in Linux (bash). I decided to write a simple bash script, and call the script from the program. Problem is, the program asks for the user to enter their email address and I need that address passed to the script for it to email. When i hard code the email address in, of course it works. But that defeats the purpose.

        cout <<"Would you like to email this file? (1=Yes 0=No)\n:";
        cin>> choice3; //holds value of user input
        if(choice3==1)
        {
                cout << "Please Enter the email address\n:";
                cin >> argv[2]; //argv[] is a buffer
                string email = argv[2];

                cout << email << endl;	//testing

                system("./email_script.sh");
                cout << "Thanks! Your email will be sent shortly.\n";
        }
        else
        cout << "Thank you! No email will be sent." << endl;



	//////////////////////////////////////////////////////////
	//email script (email_script.sh)

        email=argv[2];
        mail email < email_temp.out;

When the program executes, it saves to my Linux email box as dead.letter. When I "vi dead.letter", the Send address is argv[2]. So I assume the script isnt getting the "value", instead its getting the variable name as I declared it. Im a Senior Computer Science college student and fairly decent at programming. This Linux environment just confuses things.

Thanks in advance

[kbw]

You can pass the email address to the script as a parameter. There's an example to the technique here:
http://www.cplusplus.com/forum/general/73881/#msg395051

[superman21]

kbw,

Thank you! That helped alot. I also had to do a little more tweaking to the script as well.

        cout <<"Would you like to email this file? (1=Yes 0=No)" << endl << ":";
        cin>> choice3;
        if(choice3==1)
        {
                string email;
                cout << "Please Enter the email address" << endl << ":";
                cin >> email; //reads user input
                string cmd = "./email_script.sh ";
                cmd += email; //concatenates cmd and email

//              cout << cmd << endl;	//testing

                system(cmd.c_str()); //executes email_script.sh, passes email address
                cout << "Thanks! Your email will be sent shortly." << endl;
        }
        else
        cout << "Thank you! No email will be sent." << endl;




	//////////////////////////////////////////////////////////
	//email script (email_script.sh)

        email=$1

        mail $email < email_temp.out

I originally had the mail command as "mail email < email_temp.out". Also for the bash script to accept the variable being passed, I had to set email = $1, where $1 holds the value of the passed variable. Also, there are no semi-colons in bash. Don't know what i was thinking.

Everything works perfect now. Thanks ALOT for the help.