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1 summarized the evolution from C to C++/CLI In all the different phases of this evolution, new names have been introduced for types, functions, templates, variables, and so on C++ has introduced the concept of namespaces to avoid naming conflicts The CTS supports namespaces for the same reason C++/CLI allows you to manage CTS namespaces with language syntax you already know from C++ As a C++/CLI programmer, chances are good that you have to solve naming conflicts between names of these different phases Many C++ programs written for the Windows platforms use a variety of libraries including the C runtime, the STL, the Win32 API, ATL, and MFC All these libraries include new names Since the FCL also introduces a huge amount of new names, naming conflicts can easily happen The following code shows a simple example: // nameingTroublecpp // compile with "cl /c /clr namingTrouble.

For many problems these existing scopes are sufficient. A page can access the request scope for data specific to a single request and session scope can be used to hold objects that are required for the user s entire session such as authentication information.

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Listing 13-4. Simulating Output Ports public partial class Form1 : Form { Private readonly GpioPort gpioOutPort; public Form1(Emulator emulator) { if(emulator == null) throw new ArgumentNullException("emulator"); InitializeComponent(); this.gpioOutPort = emulator.FindComponentById("GPIOOut"); gpioOutPort.OnGpioActivity += new GpioActivity(gpioOutPort_OnGpioActivity); } private void gpioOut_OnGpioActivity(GpioPort sender, bool edge) { BeginInvoke(new MethodInvoker(delegate { this.gpioOutCheckBox.Checked = edge; } ) ); } } With each change on the output pin, the callback method is called. The somewhat awkwardly designated edge parameter immediately indicates the new level of the GPIO line. The configuration file for the output port is shown in Listing 13-5. Listing 13-5. Describing Output Ports < xml version="1.0" encoding="utf-8" > <Emulator> <Types> <GpioPort>Microsoft.SPOT.Emulator.Gpio.GpioPort</GpioPort> </Types> <EmulatorComponents> <GpioPort id="GPIOOut"> <Pin>1</Pin> <ModesAllowed>OutputPort</ModesAllowed> <ModesExpected>OutputPort</ModesExpected> </GpioPort> </EmulatorComponents> </Emulator>

cpp" using namespace System; #include <windowsh> This simple source file does not implement any function Will it compile Well, would I ask you this question if the answer was what you expect Try to compile this file with the command line mentioned in the comment and you will get a couple of strange errors telling you something about an IServiceProvider type that you have never written in the few lines of your code Since you compile with /clr, the assembly mscorlib is automatically referenced The mscorlib assembly defines many types in the namespace System The using declaration allows you to use all of these types without the namespace qualifier The interface System::IServiceProvider is one of these types If you include windowsh (the standard header file for the Win32 API), many new types and functions are declared One of these types is the COM interface IServiceProvider.

Many web applications have use cases that do not naturally fit into the scopes provided by the Servlet specification. These use cases often span more than one page but do not require the longevity of the session. Users may also perform different use cases per browser session or even execute the same use case over and over. In this scenario, data associated with one use case execution needs to be cleaned up before a new execution can begin, which is something the session cannot do. In essence, the Servlet specification is missing the concept of a conversational scope to support the execution of use cases that span multiple pages.

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