C++

Bind and Listen on an Available Port in a Range

Demonstrates Socket.BindAndListenPortRange, which searches an inclusive port range for an available TCP port, binds it, and begins listening. It returns the selected port, or -1 on failure.

Background. This is useful when any of several ports is acceptable and the application needs to discover which one was bound.

Chilkat C++ Downloads

Download Chilkat for C++

C++

#include <CkSocket.h>

void ChilkatSample(void)
    {
    CkSocket socket;

    //  Search the inclusive port range for an available TCP port, bind it, and begin listening.  The
    //  method returns the selected port, or -1 when no port can be bound.
    int boundPort = socket.BindAndListenPortRange(5000,5100,25);
    if (boundPort < 0) {
        std::cout << socket.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Listening on port " << boundPort << "\r\n";
    }