Check Whether a Socket Is Writable

See more Socket/SSL/TLS Examples

Demonstrates Socket.CheckWriteable, which waits for the connected socket to become writable. It returns 1 if writable, 0 if it did not become writable before the timeout, or -1 on error.

var
success: Integer;
socket: TChilkatSocket;
bTls: Integer;
maxWaitMs: Integer;
writable: Integer;

begin
success := 0;

socket := TChilkatSocket.Create(Self);

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

//  Wait up to 5 seconds for the socket to become writable.  Returns 1 if writable, 0 if it did not
//  become writable before the timeout, or -1 on error.
writable := socket.CheckWriteable(5000);
if (writable < 0) then
  begin
    Memo1.Lines.Add(socket.LastErrorText);
    Exit;
  end;
if (writable <> 1) then
  begin
    Memo1.Lines.Add('The socket did not become writable before the timeout.');
    Exit;
  end;
Memo1.Lines.Add('The socket is writable.');