Delphi DLL

Connect a TCP or TLS Socket

Demonstrates Socket.Connect, which establishes a TCP connection to a host and port. Setting the TLS argument to _TRUE_ performs a TLS handshake after the TCP connection succeeds.

Background. The hostname may be a DNS name or a numeric IPv4/IPv6 address. The final argument bounds how long the connect attempt waits before failing. On failure, ConnectFailReason and LastErrorText provide detail.

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Delphi DLL

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

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');

//  The socket is now connected and ready to send and receive data using whatever protocol the
//  application implements.
Memo1.Lines.Add('Connected: ' + IntToStr(Ord(CkSocket_getIsConnected(socket))));

//  Close the connection when finished.  The argument is the maximum time to wait for a clean
//  shutdown, in milliseconds.
success := CkSocket_Close(socket,1000);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    Exit;
  end;

CkSocket_Dispose(socket);