(Delphi ActiveX) TCP/IP Socket Connect to Remote Host:Port

Demonstrates how to create a TCP/IP socket, connect to a remote host:port, and receive a "Hello World!" message.

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;
receivedMsg: WideString;

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

socket := TChilkatSocket.Create(Self);

// Connect to port 5555 of localhost.
// The string "localhost" is for testing on a single computer.
// It would typically be replaced with an IP hostname, such
// as "www.chilkatsoft.com".
ssl := 0;
maxWaitMillisec := 20000;
success := socket.Connect('localhost',5555,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;

// Pretend, for the sake of the example, that the
// ficticious server is going to send a "Hello World!" 
// after accepting the connection.  
// Note: Technically, the ReceiveString may not receive the
// complete string, although it's highly probable given the short
// length of the "Hello World!" message. 
// See this Chilkat blog post for more information:
// http://www.cknotes.com/?p=302
receivedMsg := socket.ReceiveString();
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);

Memo1.Lines.Add(receivedMsg);
end;