Dart

Debugging with Socket Session Logging

See more Socket/SSL/TLS Examples

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.

Dart

import 'package:chilkat/chilkat.dart';

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

  final socket = CkSocket();

  // Enable session logging:
  socket.keepSessionLog = true;
  socket.sessionLogEncoding = 'esc';

  // To demonstrate session logging, we'll connect to an
  // HTTP server and download the HTTP response header:
  final ssl = false;
  final maxWaitMillisec = 20000;
  try {
    socket.connect('www.chilkatsoft.com', 80, ssl, maxWaitMillisec);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Set maximum timeouts for reading an writing (in millisec)
  socket.maxReadIdleMs = 10000;
  socket.maxSendIdleMs = 10000;

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

  // Send it...
  try {
    socket.sendString(httpGet);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Read the response up to the first double CRLF:
  final String httpHeader;
  try {
    httpHeader = socket.receiveUntilMatch('\r\n\r\n');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

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

  // Display the session log:
  print(socket.sessionLog);

  // Show the HTTP response header:
  print(httpHeader);
}