Delphi ActiveX

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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uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
socket: TChilkatSocket;
tls: Integer;
maxWaitMillisec: Integer;
binData: TChilkatBinData;
httpHeader: WideString;

begin
success := 0;

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

socket := TChilkatSocket.Create(Self);

// Enable session logging:
socket.KeepSessionLog := 1;
socket.SessionLogEncoding := 'esc';

tls := 1;
maxWaitMillisec := 20000;
success := socket.Connect('www.chilkatsoft.com',443,tls,maxWaitMillisec);
if (success <> 1) then
  begin
    Memo1.Lines.Add(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 <> 1) then
  begin
    Memo1.Lines.Add(socket.LastErrorText);
    Exit;
  end;

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

// Read the response up to the first double CRLF:
httpHeader := socket.ReceiveUntilMatch(#13#10 + #13#10);
if (socket.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(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:
Memo1.Lines.Add(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
// 
end;