Delphi ActiveX

Receive Text from a Socket into a StringBuilder

Demonstrates Socket.ReceiveSb, which receives text, decodes it using StringCharset, and appends it to a StringBuilder.

Background. Text send and receive operations encode and decode bytes using the StringCharset property. For plain ASCII or UTF-8 protocols, setting StringCharset to utf-8 is a safe default.

Chilkat Delphi ActiveX Downloads

Download Chilkat for Delphi ActiveX

Delphi ActiveX

var
success: Integer;
socket: TChilkatSocket;
bTls: Integer;
maxWaitMs: Integer;
command: WideString;
sb: TChilkatStringBuilder;
responseText: WideString;

begin
success := 0;

socket := TChilkatSocket.Create(Self);

//  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 := 1;
maxWaitMs := 5000;
success := socket.Connect('example.com',5000,bTls,maxWaitMs);
if (success = 0) then
  begin
    Memo1.Lines.Add(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 = 0) then
  begin
    Memo1.Lines.Add(socket.LastErrorText);
    Exit;
  end;

//  Receive text and append it to a StringBuilder, decoding using StringCharset.
sb := TChilkatStringBuilder.Create(Self);
success := socket.ReceiveSb(sb.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(socket.LastErrorText);
    Exit;
  end;

responseText := sb.GetAsString();
if (sb.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(sb.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add(responseText);