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To use this COM object from a NET caller, you need an RCW Using Visual Studio, you can create an RCW by going to Project, Add Reference, and then selecting the COM object from the list of the COM components However, you cannot use an RCW assembly created [15] in such a way from a serviced component The problem with such an assembly is that it does not have a strong name To create a strong-named RCW, you can use the utility tlbimpexe, which utilizes the type definitions from a type library to create an RCW assembly In the next example, the type library contained in the file CPPComponentdll is used to create an RCW assembly The key file for creating the strongly named assembly is referenced with the /keyfile option, the namespace of the generated types in the assembly is defined with the /namespace option, and the name of the generated assembly is defined with the/out option Using an assembly name such as InteropCPPComponentLibdll makes clear that this assembly is an RCW assembly > tlbimp CPPComponentdll /keyfile:mykeysnk /namespace:DemosCOMInterop /out: InteropCPPComponentLibdll

As Murphy said, If anything can go wrong, it will, and that is certainly as true in computer applications as in many other of life s endeavors A common feature of our code will be to search for things that go wrong and notify the user with error messages Error messages can be both general and specific For example, if some user input is required but missing, the user may get a general error message such as Field missing However, it is usually more helpful to get a specific error message like Last name is missing The drawback to having very specific error messages is that the number of them can multiply very quickly, which can be an especially serious problem in JavaScript when we are trying to minimize the size of the page sent to the browser Storing lots of possible error messages in the HTML file could cause its size to grow quickly Specific error messages often have a common form Imagine some possible error messages that might occur in a typical Customer entry form:

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out where your application is spending most of its processing time The combination of both these programming techniques and benchmarking tools will enable you to optimize your application in often surprising ways We are going to consider several ways to speed up your application We ll start with some design patterns that will enable your application to use background processing to provide or process data more quickly We ll also be including the new GWT 2 bundles, which let you save time by sending several kinds of data from the server to the client in a single trip And finally, as more general solutions, we ll also introduce several benchmarking tools that will let you detect bottlenecks in your application

With the NET component, the RCW assembly must be referenced, using the same method as referencing other NET assemblies In Listing 4-14, you can see the only method of the NET serviced component: GetContext Within this method, the COM serviced component is used to return the context ID of this inner object Because of the RCW, you can use the COM object just as you would a NET class The method GetContextID that was implemented in Listing 4-13 returns the context of the inner object and is stored in the variableinnerContext The COM object is released by calling MarshalReleaseComObject Accessing the context of the NET component is easily done by using

All these can be replaced with an error message in the more general form:

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Let s start by stating our goals clearly We want to consider design patterns that will allow greater speed from the user s point of view In truth, we are not saying the patterns will make the application faster, but at least that it will seem faster to the user; an important difference! As always, it will be a matter of trade-offs; we use some extra (client) memory, but we can skip doing repeated calls to the server, or we speculate and get some data from the server just in case the user wants it Given our preceding definition, the prevalidation pattern (that we saw in 6, Communicating with Your Server ) could equally as well have been included here, because it allows faster feedback and better usability Yet again the same could be said of the code splitting feature we ll see in the next chapter, for it allows a much faster load process, that is balanced, to be sure, with some delays down the line

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[16] the class ContextUtil The property ContextId returns the context identifier Both context identifiers are returned to the caller as output parameters of the GetContext method

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