(Java) Debugging with Socket Session Logging

Debugging with socket session logging.

The Chilkat Socket component provides properties for keeping a session log making it possible to see the exact bytes received and sent on a TCP/IP or SSL connection. To enable session logging, set the KeepSessionLog property = true. The SessionLogEncoding property controls how binary, non-printable bytes are represented in the log. There are two possible settings: Possible values are "esc" and "hex". The default value is "esc".

When set to "hex", the bytes are encoded as a hexidecimalized string. The "esc" encoding is a C-string like encoding, and is more compact than hex if most of the data to be logged is text. Printable us-ascii chars are unmodified. Common "C" control chars are represented as "\r", "\n", "\t", etc. Non-printable and byte values greater than 0x80 are escaped using a backslash and hex encoding: \xHH. Certain printable chars are backslashed: SPACE, double-quote, single-quote, etc.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSocket socket = new CkSocket();

    // Enable session logging:
    socket.put_KeepSessionLog(true);
    socket.put_SessionLogEncoding("esc");

    // To demonstrate session logging, we'll connect to an
    // HTTP server and download the HTTP response header:
    boolean ssl = false;
    int maxWaitMillisec = 20000;
    boolean success = socket.Connect("www.chilkatsoft.com",80,ssl,maxWaitMillisec);
    if (success != true) {
        System.out.println(socket.lastErrorText());
        return;
        }

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

    // The socket component includes a BuildHttpGetRequest
    // method for convenience. Build a GET and send it to 
    // the web server:
    String httpGet;
    httpGet = socket.buildHttpGetRequest("http://www.chilkatsoft.com/");

    // Send it...
    success = socket.SendString(httpGet);
    if (success != true) {
        System.out.println(socket.lastErrorText());
        return;
        }

    // Read the response up to the first double CRLF:
    String httpHeader = socket.receiveUntilMatch("\r\n\r\n");
    if (socket.get_LastMethodSuccess() != true) {
        System.out.println(socket.lastErrorText());
        return;
        }

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

    // Display the session log:
    System.out.println(socket.sessionLog());

    // Show the HTTP response header:
    System.out.println(httpHeader);
  }
}