(MFC) TCP Socket Connect through HTTP Proxy

Demonstrates how to connect through an HTTP proxy server.

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;

    // To connect through an HTTP proxy, set the HttpProxyHostname
    // and HttpProxyPort properties to the hostname (or IP address)
    // and port of the HTTP proxy.  Typical port numbers used by
    // HTTP proxy servers are 3128 and 8080.
    socket.put_HttpProxyHostname("www.my-http-proxy.com");
    socket.put_HttpProxyPort(3128);

    // Important:  Your HTTP proxy server must allow non-HTTP
    // traffic to pass.  Otherwise this does not work.

    // Connect (via the HTTP proxy) to port 5555 of 192.168.1.108.
    // hostname may be a domain name or IP address.
    const char *hostname = "192.168.1.108";
    bool ssl = false;
    int maxWaitMillisec = 20000;
    bool success = socket.Connect(hostname,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);

    // The ficticious server (in this example) is going to send a "Hello World!" 
    // message.  Read it:
    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());

    }