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: Boolean;
socket: HCkSocket;
bTls: Boolean;
maxWaitMs: Integer;
writable: 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 the socket to become writable.  Returns 1 if writable, 0 if it did not
//  become writable before the timeout, or -1 on error.
writable := CkSocket_CheckWriteable(socket,5000);
if (writable < 0) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    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.');

CkSocket_Dispose(socket);