(MFC) TCP/IP Socket Connect to Remote Host:Port

Demonstrates how to create a TCP/IP socket, connect to a remote host:port, and receive a "Hello World!" message.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkSocket.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSocket socket;

    // Connect to port 5555 of localhost.
    // The string "localhost" is for testing on a single computer.
    // It would typically be replaced with an IP hostname, such
    // as "www.chilkatsoft.com".
    bool ssl = false;
    int maxWaitMillisec = 20000;
    bool success = socket.Connect("localhost",5555,ssl,maxWaitMillisec);
    if (success != true) {
        strOut.append(socket.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Set maximum timeouts for reading an writing (in millisec)
    socket.put_MaxReadIdleMs(10000);
    socket.put_MaxSendIdleMs(10000);

    // Pretend, for the sake of the example, that the
    // ficticious server is going to send a "Hello World!" 
    // after accepting the connection.  
    // Note: Technically, the ReceiveString may not receive the
    // complete string, although it's highly probable given the short
    // length of the "Hello World!" message. 
    // See this Chilkat blog post for more information:
    // http://www.cknotes.com/?p=302
    const char *receivedMsg = socket.receiveString();
    if (socket.get_LastMethodSuccess() != true) {
        strOut.append(socket.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Close the connection with the server
    // Wait a max of 20 seconds (20000 millsec)
    success = socket.Close(20000);

    strOut.append(receivedMsg);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }