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As shown in Listing 12 5, the Main class implements two methods, StartService and StopService, which start and stop the service host, respectively. The Main class also has a few member variables, which expose the Channel, ServiceHost, and ChannelFactory. Listing 12 5. Service Host Implementation IQuickReturnTraderChat channel; ServiceHost host = null; ChannelFactory<IQuickReturnTraderChat> channelFactory = null; string userID = string.Empty(); private void StartService() { // Instantiate new ServiceHost host = new ServiceHost(this); //Open ServiceHost host.Open(); // Create a ChannelFactory and load the configuration setting channelFactory = new ChannelFactory<IQuickReturnTraderChat> ("QuickTraderChatEndpoint"); channel = channelFactory.CreateChannel(); // Lets others know that someone new has joined channel.Say("Admin", "*** New User " + userID + " Joined ****" + Environment.NewLine); } private void StopService() { if (host != null) { channel.Say("Admin", "*** User " + userID + " Leaving ****" + Environment.NewLine); if (host.State != CommunicationState.Closed) { channelFactory.Close(); host.Close(); } } }

Code access verification also walks through the code and checks that all code has the permission to execute. The goal of this service is to try to stop malicious attacks on the user s computer. A simplified way of looking at how this service works is that the CLR contains a list of actions that it can grant permission to execute, and the assembly contains a list of all the permissions it requires to run. If the CLR can grant all the permissions, then the assembly runs without problems. If, however, the CLR can t grant all the permissions, then it runs what it can but generates an exception whenever it tries to do something that it doesn t have permission to do.

If there are no existing build numbers, then the test result cannot be published. For more information, see 7.

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Garbage collection is the mechanism that allows a runtime to detect and remove managed objects from the managed heap that are no longer being physically accessed within the application. The .NET Framework s garbage collector has the added bonus of compacting the memory after it removes the unused portion, thus keeping the fingerprints of the applications as small as possible. This bonus can complicate things sometimes, as managed objects in .NET do not have a fixed location, but you can overcome this with the pin_ptr<> keyword. I cover pin_ptr<> in 20. Also, because managed objects are referenced using handles and not pointers, pointer arithmetic is gone except in unsafe sections of the code. Garbage collection presents a big change to average C++/CLI programmers, because it means an end to most of those annoying memory leaks that plague them while developing. It also has an added bonus: Programmers when dealing with memory management no longer have to figure out where to call the delete command to the classes that they ve created using the gcnew command.

IQuickReturnTraderChat Implementation (Receiver)

Summary

Caution We will see in 3 that programmers still have to be aware of when to call the delete command

Garbage collection is not the default for C++/CLI. Because this is the case, there are a few things (covered in 3) that C++/CLI programmers need to learn before they can use garbage collection in particular, the keyword ref. Fortunately, with version 2.0 of .NET, unlike in prior versions of C++/CLI, programmers have gained control of when a managed object gets deleted.

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