Send a String over a Socket

See more Socket/SSL/TLS Examples

Demonstrates Socket.SendString, which encodes a string using StringCharset and sends the resulting bytes over the connected socket. No delimiter, terminator, or length prefix is added.

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.Socket;

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

procedure RunDemo;
var
  success: Boolean;
  socket: TSocket;
  bTls: Boolean;
  maxWaitMs: Integer;
  message: string;

begin
  success := False;

  socket := TSocket.Create;

  //  Connect to the server using TLS.  The 3rd argument enables the TLS handshake after the TCP
  //  connection succeeds; the 4th is the maximum time to wait, in milliseconds.
  bTls := True;
  maxWaitMs := 5000;
  success := socket.Connect('example.com',5000,bTls,maxWaitMs);
  if (success = False) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  StringCharset controls the character encoding used when sending and receiving text.
  socket.StringCharset := 'utf-8';

  //  Encode the string using StringCharset and send the resulting bytes.  No delimiter, terminator, or
  //  length prefix is added; the exact bytes are sent.  This example sends a command for a simple
  //  application-defined text protocol.
  message := 'STATUS' + #13#10;
  success := socket.SendString(message);
  if (success = False) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;
  WriteLn('Message sent.');


  socket.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.