Delphi DLL

Send StringBuilder Contents over a Socket

Demonstrates Socket.SendSb, which encodes the contents of a StringBuilder using StringCharset and sends the resulting bytes.

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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Delphi DLL

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

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');

//  Build the text to send in a StringBuilder, then send its contents.
sb := CkStringBuilder_Create();
CkStringBuilder_Append(sb,'SET temperature 21' + #13#10);

success := CkSocket_SendSb(socket,sb);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    Exit;
  end;
Memo1.Lines.Add('Message sent.');

CkSocket_Dispose(socket);
CkStringBuilder_Dispose(sb);