convert string to barcode c# Compiling the string encoding application in Visual C#.NET

Creating ECC200 in Visual C#.NET Compiling the string encoding application

Compiling the string encoding application
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As you can see, the base64service.dll library is not required to compile the client. Instead we reference the interface. 5.7.5 Deploying the StringEncoder service on IIS To deploy the service on IIS, we need to create a virtual directory on the server. Call this directory RemoteEncoder and associate it with an appropriate physical directory.
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DEVELOPING REMOTE SERVICES
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Create a bin subdirectory and copy the interface assembly, istringencoder.dll, and the remote object assembly, base64service.dll, into it. Next, we need to configure the remote service. In a Web scenario, the application configuration file is called web.config and is placed in the application s root directory. (We ll look at web.config in more detail in chapter 8.) Listing 5.16 presents a web.config file which exposes the object for Singleton mode activation.
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Listing 5.16 The web.config configuration file
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<!-file : web.config description : IIS config file for RemoteEncoder.Base64Service --> <configuration> <system.runtime.remoting> <application> <service> <wellknown type="RemoteEncoder.Base64Service, Base64Service" objectUri="Base64Service.rem" mode="Singleton" /> </service> </application> </system.runtime.remoting> </configuration>
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We specify Base64Service.rem as the objectUri. You must use an object URI that ends in .rem or .soap when hosting server-activated objects inside IIS. 5.7.6 Testing the IIS-hosted encoder We don t need to do anything special to load the remote object into IIS. Instead, IIS does so automatically when it receives the first client request. Therefore, we need only launch the client, as shown in figure 5.16.
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REMPOK: A REMOTE POKER GAME
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We return to our case study with a version of the poker machine which uses a RemPokService object to deal and draw cards. The service supports both server-activated Singleton mode and client-activated mode on either TCP or HTTP channels.
Developing the remote poker service Listing 5.17 presents the service program called RemPokService.cs:
Listing 5.17 A remote poker machine service
// file : RemPokService.cs // compile : csc /r:poker.dll RemPokService.cs namespace Poker { using System; using System.Runtime.Remoting; // use serializable GameResult struct to return game result... [Serializable] public struct GameResult { public string Hand; public int Score; public string Title; } public class RemPokService : MarshalByRefObject { public RemPokService() { Console.WriteLine("RemPokService activated..."); } public string Deal() { string hand = new SimpleMachine().Deal().Text; Console.WriteLine("Dealing : {0}", hand); return hand; } public GameResult Draw(string oldHand, string holdCards) { GameResult g = new GameResult(); Hand h = new SimpleMachine().Draw(oldHand, holdCards); g.Hand = h.Text; g.Score = h.Score; g.Title = h.Title; Console.WriteLine("Drawing : {0} ({1})", g.Hand, g.Title); return g; } public static void Main(string[] args) { // get the default application configuration file name... string configFile = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;
DEVELOPING REMOTE SERVICES
// configure remoting... Console.WriteLine("using " + configFile + "..."); RemotingConfiguration.Configure(configFile); Console.WriteLine("waiting for remote calls..."); Console.WriteLine("hit ENTER to exit..."); Console.ReadLine(); } } }
The game is similar to versions seen earlier. The most notable difference is the addition of a serializable GameResult structure to return the game result to the client. This provides a neat way of packaging the hand, score, and title fields for transmission to the calling client. The Main routine retrieves the default configuration file name, as follows:
string configFile = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;
In this case, this should return RemPokService.exe.config, which we ll look at next. Then the program configures remoting. 5.8.2 The remote poker machine configuration file Listing 5.18 shows the configuration file for the remote service.
Listing 5.18 The remote poker machine configuration file
<!-file : RemPokService.exe.config description : server configuration file for remote poker service --> <configuration> <system.runtime.remoting> <application> <service> <!-- server-activated singleton --> <wellknown type="Poker.RemPokService, RemPokService" objectUri="RemPokService" mode="Singleton" /> <!-- client-activated --> <activated type="Poker.RemPokService, RemPokService" /> </service> <channels>
REMPOK: A REMOTE POKER GAME
<!-- TCP channel --> <channel ref="tcp" port="6789" /> <!-- HTTP channel --> <channel ref="http" port="8085" /> </channels> </application> </system.runtime.remoting> </configuration>
The configuration file specifies both server-activated singleton and client-activated modes. It also specifies both TCP and HTTP channels. We ll use command-line switches with the client program to choose the operational activation mode and channel at run time. 5.8.3 The RemPok poker client Listing 5.19 shows the poker client.
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