Question

This is my method which is called when I click on a button in my C# GUI program. It launches a very simple C++ console program that does nothing but prints out a line every second in a never ending loop.

private static Process process;

private void LaunchCommandLineApp()
{
    process = new Process();
    process.StartInfo.FileName = "SimpleTest.exe";
    process.StartInfo.UseShellExecute = false;
    process.StartInfo.RedirectStandardOutput = true;
    process.EnableRaisingEvents = true;
    process.StartInfo.CreateNoWindow = false;
    process.OutputDataReceived += process_OutputDataReceived;

    process.Start();
    process.BeginOutputReadLine();
}

This is the method to handle any output data received:

private void process_OutputDataReceived(object sender, DataReceivedEventArgs e)
{
    if (e.Data != null)
        Console.WriteLine(e.Data.ToString());
}

I do not see any output in my C# debug output…
But if i change the printf to std::cout, it will show the redirected message.

I am thinking if there’s any way to show those statements using printf ?

FYI: my c++ code [EDITED working version]:

#include <stdio.h>
#include <Windows.h>
#include <iostream>

int main()
{
int i = 0;

for(;;)
{
    Sleep(1000);
    i++;
    // this version of printf with fflush will work
    printf("The current value of i is %d\n", i);
    fflush(stdout);

    // this version of cout will also work
    //std::cout << "the current value of i is " << i << std::endl;
}

printf("Program exit\n");
}

Answer 1

Thanks guys for all your inputs!

I think I would change all my printf to std::cout and std::endl for my C++ console program.