1、;d 4-1-1f3. hostj #LYDNSHf4. portj #L4Y =d 4-1-2fI7.yjSystem.ArgumentNullException j premoteEPNothingfSystem.ArgumentOutOfRangeException j pportMinPortqMaxPort fSystem.Net.Sockets.SocketException j_Socket *8 UyfSystem.InvalidOperationException j#LSocket B IfSystem.NotSupportedException j j fSystem.O
2、bjectDisposedException jSocket fSystem.Security.SecurityException j“mSocketfmL #LY VhjImports System.NetImports System.Net.Sockets.TryDim clientSocket As New Socket( _AddressFamily.InterNetwork, _SocketType.Stream, ProtocolType.Tcp)Dim serverIP As IPAddress = _Dns.Resolve(“Server“).AddressList(0)6-9
3、6L VDim serverhost As New IPEndPoint(serverIP, 80)clientSocket.Connect(serverhost).Catch ex As SocketException.End Tryud_System.Net.Sockets.Socket9J1Berkeley Socket Distribution API ? 8YdSocket9YConnect,BSDS dmS ynchronousYI/O id BA synchronous id4Socket9YBeginConnectEndConnect,d #L YjBeginConnect,j
4、Public Function BeginConnect (remoteEP As EndPoint, _callback As AsyncCallback, state As Object _) As IAsyncResultPublic Function BeginConnect (address As IPAddress, _port As Integer, requestCallback As AsyncCallback, _state As Object) As IAsyncResultPublic Function BeginConnect (addresses As IPAddr
5、ess(), _port As Integer, requestCallback As AsyncCallback, _state As Object) As IAsyncResultPublic Function BeginConnect (host As String, _port As Integer, requestCallback As AsyncCallback, _state As Object) As IAsyncResult6-10I pj1. remoteEPjSystem.Net.IPEndPoint9 #LIPg =d4-1-2f2. addressj #LIPgdSy
6、stem.Net.IPAddress9d 4-1-1f3. hostj #LYDNSHf4. portj #L4Y =d 4-1-2f5. callbackjm*AsyncCallbackCallback,f 6. statejJ YK fI =IAsyncResultd*8Y KfI7.yjSystem.ArgumentNullException j premoteEPNothingfSystem.Net.Sockets.SocketException jmSocket *8 UyfSystem.ObjectDisposedException jSocket f hY ljTryDim cl
7、ientSocket As New Socket( _AddressFamily.InterNetwork, _SocketType.Stream, ProtocolType.Tcp)Dim serverIP As IPAddress = _Dns.Resolve(“Server“).AddressList(0)Dim serverhost As New IPEndPoint(serverIP, 80)clientSocket.BeginConnect(serverhost, _New AsyncCallback( _AddressOf Async_Send_Receive.Connect_Callback), _clientSocket).垨(匀%瀀讀缁缀節貔%頀h椀搀漀