How to run project with special command line?

[mnm71]

I want to run my TCP project by command line

tcpserver --port 3333

How can do it and what should change in the c++ code?

[Ganado]

Are you asking how to add command-line argument handling to your program?

Set up main like:

int main(int argc, char* argv[])
{

}

argc is the number of arguments, and argv is an array of char* strings.
argv[0] is the name of the program itself on any mainstream shell.

So, for your example, argv[1] is "--port" and argv[2] is "3333".

You would do:

#include <iostream>
#include <string>

int main(int argc, char* argv[])
{
    if (argc <= 2)
    {
        // not enough arguments
        std::cerr << "Usage: tcpserver --port <number>\n";
        return 1;
    }

    for (int i = 1; i < argc; i++)
    {
        if (std::string(argv[i]) == "--port" && i + 1 < argc)
        {
            const char* port = argv[i + 1];
            std::cout << "Port: " << port << '\n';
        }
    }

}

[mnm71]

@Ganado thank you for replying to my question