Wait for a Socket to Become Readable

See more Socket/SSL/TLS Examples

Demonstrates Socket.SelectForReading, which waits for read-ready activity on the socket, or on any contained socket when the object is a socket set. It returns 1 if ready, 0 on timeout, or -1 on error.

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

begin
success := False;

socket := CkSocket_Create();

//  Connect to the server using TLS.
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;

//  Wait up to 5 seconds for read-ready activity on the socket (or, for a socket set, on any contained
//  socket).  Returns 1 if ready, 0 on timeout, or -1 on error.
ready := CkSocket_SelectForReading(socket,5000);
if (ready < 0) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    Exit;
  end;
if (ready <> 1) then
  begin
    Memo1.Lines.Add('No data became available before the timeout.');
    Exit;
  end;
Memo1.Lines.Add('The socket has data ready to read.');

CkSocket_Dispose(socket);