Pascal (Lazarus/Delphi)

Demonstrates KeepSessionLog and SessionLog

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/TLS 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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Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.BinData,
  Chilkat.Socket;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  socket: TSocket;
  tls: Boolean;
  maxWaitMillisec: Integer;
  binData: TBinData;
  httpHeader: string;

begin
  success := False;

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

  socket := TSocket.Create;

  //  Enable session logging:
  socket.KeepSessionLog := True;
  socket.SessionLogEncoding := 'esc';

  tls := True;
  maxWaitMillisec := 20000;
  success := socket.Connect('www.chilkatsoft.com',443,tls,maxWaitMillisec);
  if (success <> True) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  Send a GET start line to the web server..
  success := socket.SendString('GET /abc123.abc123 HTTP/1.1' + #13#10);
  if (success <> True) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  Send some bytes that will cause an error...
  binData := TBinData.Create;
  binData.AppendEncoded('01020304','hex');
  success := socket.SendBd(binData);

  //  Read the response up to the first double CRLF:
  httpHeader := socket.ReceiveUntilMatch(#13#10 + #13#10);
  if (socket.LastMethodSuccess <> True) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

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

  //  Display the session log:
  WriteLn(socket.SessionLog);

  //  The Session log will show the exact bytes sent and received.
  //  In this case, the session log shows:

  //  	SendString: GET\x20/abc123.abc123\x20HTTP/1.1\r\n
  //  		
  //  	SendBytes: \x01\x02\x03\x04
  //  	ReceiveUntilMatch: HTTP/1.1\x20400\x20Bad\x20Request\r\n
  //  		Content-Type:\x20text/html;\x20charset=us-ascii\r\n
  //  		Server:\x20Microsoft-HTTPAPI/2.0\r\n
  //  		Date:\x20Thu,\x2027\x20Oct\x202016\x2013:16:02\x20GMT\r\n
  //  		Connection:\x20close\r\n
  //  		Content-Length:\x20339\r\n
  //  		\r\n
  //  		<!DOCTYPE\x20HTML\x20PUBLIC\x20\"-//W3C//DTD\x20HTML\x204.01//EN\"\"http://www.w
  //  		3.org/TR/html4/strict.dtd\">\r\n
  //  		<HTML><HEAD><TITLE>Bad\x20Request</TITLE>\r\n
  //  		<META\x20HTTP-EQUIV=\"Content-Type\"\x20Content=\"text/html;\x20charset=us-ascii
  //  		\"></HEAD>\r\n
  //  		<BODY><h2>Bad\x20Request\x20-\x20Invalid\x20Header</h2>\r\n
  //  		<hr><p>HTTP\x20Error\x20400.\x20The\x20request\x20has\x20an\x20invalid\x20header
  //  		\x20name.</p>\r\n
  //  		</BODY></HTML>\r\n
  //  


  socket.Free;
  binData.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.