passing arguments and returns between c# application and c++ exe file

Question

I want to call an c++ exe file into my c# application that takes a command line argument and returns the result so that i can use it in my c# application but i don't know how to do it .

here's the simple sample that i tried and failed : c++ code : returner.exe

#include<iostream>
#include<cstdlib>
using namespace std;
int main(string argc , string argv)
{
    int b= atoi(argv.c_str());
    return b;
}

c# code :

 private void button1_Click(object sender, EventArgs e)
        {
            ProcessStartInfo stf = new ProcessStartInfo("returner.exe", "3");
            stf.RedirectStandardOutput = true;
            stf.UseShellExecute = false; 
            stf.CreateNoWindow = true;

            using (Process p = Process.Start(stf))
            {
                p.WaitForExit();
                int a = p.ExitCode;
                label1.Text = a.ToString();
            }
        }

i expect to see 3 in the lable . but it's always 0 . what should i do ?

Is your C++ code even valid? That main signature is not standard. — Mat
– Mat, Commented Jan 1, 2013 at 19:19
Have you, maybe, considered debugging at all? What happens if your C++ main explicitly returns '3', ie. ignores the 'main' parameters, (which I'm not at all happy with - see Mat comment). — Martin James
– Martin James, Commented Jan 1, 2013 at 19:23
I'm not an expert in c++ so if you know how to write c++ code tell me . yes if my c++ code explicitly returns 3 i would see 3 in label . — arman radan
– arman radan, Commented Jan 1, 2013 at 19:28
int main(int argc, const char** argv) -> this is a correct prototype for the main function. From that you should perhaps be able to do something — Jaffa
– Jaffa, Commented Jan 1, 2013 at 19:30

Yakov Galka · Accepted Answer · 2013-01-01 19:41:47Z

3

The signature of your main is incorrect, it should be:

int main(int argc, char *argv[])
{
    // you are better to verify that argc == 2, otherwise it's UB.
    int b= atoi(argv[1]);
    return b;
}

answered Jan 1, 2013 at 19:41

Yakov Galka

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