Send and Receive text using sockets in Delphi 2010

Question

I do not have much familiarity with Delphi 2010 and am having trouble with using components ClientSocket and ServerSocket. The question is simple: I am trying to send a text from a client to a server using the following code:

cliente.Socket.SendText('call');

On the server side I writed the following code:

procedure TForm6.ServerClientRead(Sender: TObject; Socket: TCustomWinSocket);
var
s: string;
begin
s:=Socket.ReceiveText;
if s = 'call' then
begin
showmessage('Client is Calling');
end;
end;

However, the server dont displaying the message. Could help me once more?

Answer 1

In D2009+, SendText() and ReceiveText() do not work correctly with Unicode strings. It is better to use SendBuf() and ReceiveBuf() directly instead.

With that said, TClientSocket and TServerSocket have been deprecated for a LONG time. You should use a different component set, such as Indy (which also ships with Delphi), eg:

IdTCPClient1.IOHandler.WriteLn('call');

procedure TForm6.IdTCPServer1Execute(AContext: TIdContext);
var
  s: string;
begin
  s := AContext.Connection.IOHandler.ReadLn;
  if s = 'call' then
  begin
    // TIdTCPServer is a multi-threaded component,
    // but ShowMessage() is not thread-safe...
    Windows.MessageBox(0, 'Client is Calling', '', MB_OK);
  end;
end;