(Delphi DLL) 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.

Chilkat for Delphi Downloads

Chilkat non-ActiveX DLL for Delphi

Chilkat ActiveX DLL for Delphi

* The examples here use the non-ActiveX DLL.

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
socket: HCkSocket;
tls: Boolean;
maxWaitMillisec: Integer;
success: Boolean;
binData: HCkBinData;
httpHeader: PWideChar;

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

socket := CkSocket_Create();

// Enable session logging:
CkSocket_putKeepSessionLog(socket,True);
CkSocket_putSessionLogEncoding(socket,'esc');

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

// Send a GET start line to the web server..
success := CkSocket_SendString(socket,'GET /abc123.abc123 HTTP/1.1' + #13#10);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    Exit;
  end;

// Send some bytes that will cause an error...
binData := CkBinData_Create();
CkBinData_AppendEncoded(binData,'01020304','hex');
success := CkSocket_SendBd(socket,binData);

// Read the response up to the first double CRLF:
httpHeader := CkSocket__receiveUntilMatch(socket,#13#10 + #13#10);
if (CkSocket_getLastMethodSuccess(socket) <> True) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    Exit;
  end;

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

// Display the session log:
Memo1.Lines.Add(CkSocket__sessionLog(socket));

// 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
// 

CkSocket_Dispose(socket);
CkBinData_Dispose(binData);

end;