Receive a Bounded String from a Socket

See more Socket/SSL/TLS Examples

Demonstrates Socket.ReceiveStringMaxN, which receives and decodes text like ReceiveString but reads at most a given number of input bytes.

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;
  command: string;
  firstChunk: 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';
  //  Send a request using a simple application-defined text protocol in which each message ends with a
  //  CRLF.
  command := 'STATUS' + #13#10;
  success := socket.SendString(command);
  if (success = False) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  Receive and decode text like ReceiveString, but read at most the given number of input bytes.
  //  The limit is measured in bytes, not Unicode characters.
  firstChunk := socket.ReceiveStringMaxN(64);
  if (socket.LastMethodSuccess = False) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;
  WriteLn(firstChunk);


  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.