Delphi DLL

Move a Connection into a Socket Set

Demonstrates Socket.TakeSocket, which moves a connection into a newly created member of this object's socket set. After one or more calls, the object acts as a set of sockets.

Background. A socket set groups multiple connections so they can be monitored together with the SelectForReading and SelectForWriting methods. After success, the source socket holds no connection.

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var
success: Boolean;
listenSock: HCkSocket;
connectedSock: HCkSocket;
socketSet: HCkSocket;

begin
success := False;

listenSock := CkSocket_Create();

success := CkSocket_BindAndListen(listenSock,5000,25);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(listenSock));
    Exit;
  end;

connectedSock := CkSocket_Create();
success := CkSocket_AcceptNext(listenSock,20000,connectedSock);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(listenSock));
    Exit;
  end;

//  Move the connection out of connectedSock and into a newly created member of this object's socket
//  set.  After one or more such calls, socketSet acts as a set of connected sockets (useful with the
//  SelectForReading / SelectForWriting methods).  After success, connectedSock holds no connection.
socketSet := CkSocket_Create();
success := CkSocket_TakeSocket(socketSet,connectedSock);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(socketSet));
    Exit;
  end;
Memo1.Lines.Add('Connection added to the socket set.');

CkSocket_Dispose(listenSock);
CkSocket_Dispose(connectedSock);
CkSocket_Dispose(socketSet);