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Generator DataMatrix in C# HOSTING AND COMMUNICATIONS

CHAPTER 8 HOSTING AND COMMUNICATIONS
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msg = queue.Receive(new TimeSpan(0, 0, 1)); msg.Formatter = new BinaryMessageFormatter(); QLibrary.DocDescription d = (QLibrary.DocDescr)msg.Body; QLibrary.DocDescription.SendToDatabase(d); } catch { Thread.Sleep(1000); } } } This code sets up a single loop that will iterate as long as the bDone Boolean variable remains true. This value is set to false in the overridden OnStop method (shown in the preceding code), and so when the system shuts down or an administrator stops the service, this loop will terminate and the process hosting the thread will be torn down. Within the loop, we use the MessageQueue instance to monitor the thread for incoming messages. The call to the Receive method does this, and we re using a TimeSpan to specify that the operation should time out if no message arrives within one second. If the timeout occurs, the Receive method throws an exception, at which point we re putting the thread to sleep for one second before monitoring the queue again. This keeps the listener quiet in times when no messages arrive in the queue. When a message does arrive, execution continues in the body of our try block. Anything can be packed away into a message body. For our application, we re packing away an instance of the DocDescription object. We obtain a reference to this object by casting the Body of the message into the DocDescription type. We ll show you the client code that sends an instance of this type into the message body in a bit. First take a look at the definition of the instance portions of the DocDescription type itself. (We ll cover the static methods later. This code is from the QLibrary project in the Code08 solution.) [Serializable()] public class DocDescription { //Static methods omitted for brevity public DocDescription() { } public DocDescription(string docIP, string docPath, string docName) { this.DocIP = docIP; this.DocPath = docPath; this.DocName = docName; } private string docName; public string DocName { get { return docName; } set { docName = value; } } private string docIP;
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CHAPTER 8 HOSTING AND COMMUNICATIONS
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public string DocIP { get { return docIP; } set { docIP = value; } } private string docPath; public string DocPath { get { return docPath; } set { docPath = value; } } } This is a simple type, which contains three properties: an IP a path, and a name. You use , this object to pass state information over the wire in the body of the message. The listener application sends the object on to the database by calling a static method on DocDescription that uses ADO.NET to call a stored procedure (not shown here, as this could be any data access layer call). On the client, you need to write code that will place messages into the queue. This code could run on an end user s machine for a rich client Windows Forms application, or could be executed from ASP .NET for a Web-based application (resulting from a Web Service call from the client, for example). This code is also in DocDescription.cs of the QLibrary project. public static void SendToQueue(DocDescr d) { MessageQueue q = new MessageQueue(QueueName); Message msg = new Message(d, new BinaryMessageFormatter()); q.Send(msg); } This code accepts an instance of the DocDescription type and serializes it into the message body using the binary message formatter. Note that this is the same formatter used in the listener to pull the instance out of the message body (as seen in the code for MonitorQueue). The client code then simply surfs the hard drive of your user, creating an instance of DocDescription and posting it to the queue whenever a Word document is found. (This code is Form1.cs of the QClient project in the Code08 solution.) bool bDone = false; int count; string ip = System.Net.Dns.GetHostAddresses (System.Net.Dns.GetHostName())[0].ToString(); private void btnScan_Click(object sender, EventArgs e) { count = 0; bDone = false; btnScan.Enabled = false; btnCancel.Enabled = true; Thread t = new Thread(FindDocs);
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