Delphi DLL

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.

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var
success: Boolean;
socket: HCkSocket;
bTls: Boolean;
maxWaitMs: Integer;
command: PWideChar;
sb: HCkStringBuilder;
responseText: PWideChar;

begin
success := False;

socket := CkSocket_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 := CkSocket_Connect(socket,'example.com',5000,bTls,maxWaitMs);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    Exit;
  end;

//  StringCharset controls the character encoding used when sending and receiving text.
CkSocket_putStringCharset(socket,'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 := CkSocket_SendString(socket,command);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    Exit;
  end;

//  Receive text and append it to a StringBuilder, decoding using StringCharset.
sb := CkStringBuilder_Create();
success := CkSocket_ReceiveSb(socket,sb);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    Exit;
  end;

responseText := CkStringBuilder__getAsString(sb);
if (CkStringBuilder_getLastMethodSuccess(sb) = False) then
  begin
    Memo1.Lines.Add(CkStringBuilder__lastErrorText(sb));
    Exit;
  end;
Memo1.Lines.Add(responseText);

CkSocket_Dispose(socket);
CkStringBuilder_Dispose(sb);