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    <p>I made it! Finaly!!!</p> <p>WSAAsyncSelect() structure</p> <pre><code> [DllImport("wsock32.dll")] public static extern int WSAAsyncSelect( int socket, int hWnd, int wMsg, int lEvent ); </code></pre> <p>WS2 Class</p> <pre><code>public class WS2 { public static Socket sock; public static byte[] data = new byte[8096]; public static int server = 0; public static bool forced = true; public static void Close() { //Extern.closesocket(sock.Handle.ToInt32()); //Extern.WSACleanup(); sock.Shutdown(SocketShutdown.Both); sock.Close(); if (forced) { Connect(); } } public static void ConnectTo(string ip,int port) { sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); sock.Connect(ip, port); int handle = 0; var form1 = Form.ActiveForm as FormMain; if (form1 != null) handle = form1.GetHandle; if (handle == 0) { FormMain.PerformActionOnMainForm(form =&gt; form.memo.Text += "An error occured: Error code WS_01_ASYNC_HANDLE"); return; } Extern.WSAAsyncSelect(sock.Handle.ToInt32(), handle, Values.MESSAGE_ASYNC, Values.FD_READ | Values.FD_CLOSE); } public static void Connect() { //Get IP &amp;&amp; port string ip = GetIPFromHost("gwgt1.joymax.com"); if (ip == "") { ip = GetIPFromHost("gwgt2.joymax.com"); if (ip == "") { } server +=2; } else server +=1; int port = 15779; // ConnectTo(ip, port); } public static void Receive() { int size = sock.Receive(data); if (size == 0) { FormMain.PerformActionOnMainForm(form =&gt; form.memo.Text += "An error occured: Error Code WS_02_RECV_BEGN"); } Main.Handle(data, size); } public static string GetIPFromHost(string HostName) { IPHostEntry ip; try { ip = Dns.GetHostEntry(HostName); } catch (Exception) { return ""; } return ip.AddressList[0].ToString(); } } </code></pre> <p>WndProc in the Form class.</p> <pre><code> protected override void WndProc(ref Message m) { if (m.Msg == Values.MESSAGE_ASYNC) { switch (m.LParam.ToInt32()) { case Values.FD_READ: WS2.Receive(); break; case Values.FD_WRITE: break; case Values.FD_CLOSE: WS2.Close(); break; default: break; } } else { base.WndProc(ref m); } } </code></pre> <p>Get Handle:</p> <pre><code> public int GetHandle { get { if (this.InvokeRequired) { return (int)this.Invoke((GetHandleDelegate)delegate { return this.Handle.ToInt32(); }); } return this.Handle.ToInt32(); } } private delegate int GetHandleDelegate(); </code></pre>
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    1. POHow to Invoke and use WSAAsyncSelect() in C#?
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    1. USIvan Prodanov
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    1. COVery nice. This would solve a huge problem with the C# .NET Framwork: There is no way to enqueue an asynchronous socket read for completion on the UI thread.
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      1. USJames Brock
 

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