vb.net qr code generator How to Notify Nevertheless in VB.NET

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How to Notify Nevertheless
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But what if you nevertheless have to notify a number of clients I am afraid that .NET Remoting might not be the best solution for the notification scenario (although you can, of course, still use it for all client-to-server communication.) Instead, you should take a look at technologies like UDP MSMQ, or IP Multicasting, which allow you to broadcast events efficiently to a num, ber of subscribers. UDP broadcasts can be used if all clients are located in the same IP subnet and if you don t need reliable delivery (i.e., if the events are not critical and when it wouldn t matter whether a small percentage of them are never received at all clients). In addition, UDP limits the payload to 64KB. The main advantage of using UDP broadcasts is that only a single IP packet will be sent to your network, no matter how many applications are listening. A simple UDP client that listens for broadcast packets on port 10000 will look like this: using using using using System; System.Text; System.Net.Sockets; System.Net;
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public class Receiver { public static void Main() { Socket sck = new Socket( AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); sck.Bind(new IPEndPoint( IPAddress.Any, 10000)); byte[] buf = new byte[65000]; while (true) { int size = sck.Receive(buf); String str = Encoding.ASCII.GetString(buf,0,size); Console.WriteLine("Received: {0}", str); } } }
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CHAPTER 9 .NET REMOTING TIPS AND BEST PRACTICES
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The following application is a matching sender that allows the user to enter a string that should be broadcast: using using using using System; System.Text; System.Net; System.Net.Sockets;
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public class Sender { public static void Main() { Console.Write("Enter String to broadcast:"); String str = Console.ReadLine(); byte[] data = Encoding.ASCII.GetBytes(str); Socket sck = new Socket( AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); sck.Connect(new IPEndPoint( IPAddress.Broadcast,10000)); sck.Send(data); sck.Close(); } } When using broadcasting schemes based on UDP you have to be aware that events might be , lost and that a single packet might be received multiple times if the code binds the socket to all existing network interfaces. This has been done in the preceding code by using IPAddress.Any at the receiving side, and by using IPAddress.Broadcast on the sending side.3
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Message Queuing to the Rescue
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Contrary to UDP MSMQ is the technology of choice if you need guaranteed asynchronous , delivery of notifications.
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Note MSMQ is a built-in part of Windows XP, Windows 2000, and Windows Server 2003 that has to be
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selected during installation and might not be available on all client machines by default. There are no additional licensing costs for using MSMQ in your applications.
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3. If you are interested in more details, I d recommend having a look at the book Pro .NET 1.1 Network Programming, Second Edition by Christian Nagel et al. (Apress, 2004).
CHAPTER 9 .NET REMOTING TIPS AND BEST PRACTICES
By default, MSMQ does not use broadcasting or multicasting, but instead requires that the data for each client be sent in a separate connection. This sending is, however, performed in the background by the MSMQ Server running on the sending machine. (Machines using the current version of MSMQ are server and client at the same time!) The sending application basically only needs to tell the messaging framework to take care of delivering the messages but does not have to wait for completion. Whenever you want to use MSMQ for notifications, you will usually create a destination queue on each of your clients. This can be done programmatically during installation or use of your application (if the user has the necessary permissions to create queues). A very simple receiving application can, for example, look like this (you have to add a reference to System.Messaging.DLL): using System; using System.Messaging; class Receiver { static void Main(string[] args) { String queuename = @".\private$\NOTIFICATIONS"; if (!MessageQueue.Exists(queuename)) { MessageQueue.Create(queuename); } MessageQueue que = new MessageQueue(queuename); que.Formatter = new BinaryMessageFormatter(); while (true) { using (Message msg = que.Receive()) { String str = (String) msg.Body; Console.WriteLine("Received: {0}", str); } } } } This application creates an incoming private queue called NOTIFICATIONS and waits for incoming messages.
Note Private queues can be reached from other machines if the sender knows their exact name. They
simply do not appear in the Active Directory (AD).
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