source code to generate barcode in vb.net 27: NET Remoting in C#.NET

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27: NET Remoting
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The parameters of the RegisterWellKnownServiceType() method include the following: The type of class in the remote object typeof(Hello) in the preceding example The name by which the client can call the remote object "HelloWorld" in this case This is called the URI (Uniform Resource Identifier) For a TCP channel, it is a simple string as seen here For an HTTP channel, it is the actual server location "http://localhost/ServerApp" for example The SingleCall mode means that a new instance is created for every method call EXAM TIP There are two different well-known object modes for server-activated objects: SingleCall, where there is a new instance for every method call and no state is maintained between method calls, and Singleton, where every method call uses the same instance of the remote object The last lines of the remote server code consists of console output lines that will allow the server to continue running until the user presses ENTER on the console application The code demonstrates a hosting application in our case a console application An alternative approach would be to create the remote object and register it in Internet Information Server (IIS) as a web service object In that case, you would have created an HTTPServerChannel within the remote object itself We will look at code that does this later Save the file as HelloWorldServercs and compile it as follows:
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csc /r:Hellodll HelloWorldServercs
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PART V
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Building the Client
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The client application is the last step for this demonstration We will create a simple console application that will create a TcpClientChannel object which will be used to transmit the client s request We will then use the Activator class to find the remote object and invoke its method Here is the code:
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using System; using SystemRuntimeRemotingChannels; using SystemRuntimeRemotingChannelsTcp; namespace HelloWorld { public class HelloWorldClient { [STAThread] public static void Main() { ChannelServicesRegisterChannel (new TcpClientChannel()); Hello h = (Hello) ActivatorGetObject (typeof(Hello), "tcp://localhost:4242/Hello"); SystemConsoleWriteLine (hHelloWorld());
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} } }
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Let s look at the key lines of code:
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ChannelServicesRegisterChannel (new TcpClientChannel());
Notice that we do not select a port number here any free port will do The client is simply using the port as an exit mechanism for the remote call On the server side, we will connect to port 4242, which is where the server is running In the next line of code, the client instantiates the Hello object by using the GetObject() method of the Activator class:
Hello h = (Hello) ActivatorGetObject (typeof(Hello), "tcp://localhost:4242/Hello");
Notice the parameters that are sent to the GetObject() method: typeof(Hello) tells the method the class type of the remote object "tcp://localhost:4242/Hello" tells the method where to find the remote object We have selected the localhost (the local computer), port 4242 (where the component is registered and waiting for calls), and the URI (Hello), a named identity EXAM TIP Now for the $64,00000 question! The reference Hello h is what type of variable Remember that the client never talks to the remote object directly The variable h refers to the proxy object Actually, it refers to the transparent proxy object, which then communicates with the real proxy object
Running the Remote Application
All the pieces are now in place, and we are ready to test our remote application The first step is to start the hosting server application, HelloWorldServerexe (see Figure 27-4) In Figure 27-5, you can see that we have compiled all of our programs and have started the client application Notice in Figure 27-5 that the server has responded with Hello World! indicating that the client application has successfully sent a message to the remote server You can also examine the hosting application s response to the method calls recall that we inserted console output to indicate method calls Figure 27-6 shows the console output from the hosting server While you are in the process of developing remote components and testing them as we have done in this example, it is a good idea to place SystemConsoleWriteLine statements in your methods By doing this, you can see what is happening as the remote calls come through to the server object Notice in our example that the constructor is called and then the HelloWorld() method is called By looking at the output, you can see that we were successful in creating a remote component and building a remote server for it to execute through
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