(Delphi ActiveX) 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 = 1. 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 ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

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
socket: TChilkatSocket;
ssl: Integer;
maxWaitMillisec: Integer;
success: Integer;
httpGet: WideString;
httpHeader: WideString;

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

socket := TChilkatSocket.Create(Self);

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

// To demonstrate session logging, we'll connect to an
// HTTP server and download the HTTP response header:
ssl := 0;
maxWaitMillisec := 20000;
success := socket.Connect('www.chilkatsoft.com',80,ssl,maxWaitMillisec);
if (success <> 1) then
  begin
    Memo1.Lines.Add(socket.LastErrorText);
    Exit;
  end;

// 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:

httpGet := socket.BuildHttpGetRequest('http://www.chilkatsoft.com/');

// Send it...
success := socket.SendString(httpGet);
if (success <> 1) then
  begin
    Memo1.Lines.Add(socket.LastErrorText);
    Exit;
  end;

// 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)
success := socket.Close(20000);

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

// Show the HTTP response header:
Memo1.Lines.Add(httpHeader);
end;