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Error handling should be nothing new to software developers. All programmers have written code that verifies that the processes in their code work properly and, if they don t, does something special to correct them. Wouldn t it be nice if nothing could go wrong with your programs, and you could write code without having to worry about whether something might go wrong Well, you can use exceptions to do that sort of. Along with the exception s normal role of handling all unforeseen problems, it can actually allow you to code in a manner as if nothing will go wrong and then capture all the possible errors at the end. This separation of error handling from the main code logic can make the program much easier to work with. It eliminates multiple layers of if statements with the sole purpose of trapping errors that might occur (but most probably won t). With C++/CLI, exceptions have been taken one step further than with traditional C++. Exceptions can now be thrown across language boundaries. That means that if, for example, you code a ref class in C++/CLI, and the ref class is used in some C# code, any exceptions thrown in the C++/CLI class can be caught by the C# code. A major benefit of this is there is that no need for checking the HResult for errors any longer (if implemented using exceptions). You just have to code as if things worked correctly, because if they didn t, the error would be caught by the exception handler. I won t go into multilanguage programming in this book, but rest assured it does work.

Coding for exceptions is very easy. You break your code up into three parts: the code for successful execution, the errors, and the code to clean up afterward. In C++/CLI, these three parts are known as

change often, and it is impossible to cover all scenarios. The important thing to remember is that the legal issues have nothing to do with P2P technology itself, but with the way the technology is being used.

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the try block, the catch block, and the finally block I will describe the try and catch blocks now and examine the finally block at the end of this section The process for handling exceptions is a little tricky for new developers because the linear flow of the code is broken Whenever an error occurs, the program throws an exception At this point, normal execution flow of the program ends, and the program goes in search of a handler for the exception that it threw You ll see how the program searches for exceptions later, in the section Catching Multiple Exceptions If it doesn t find an exception, the program terminates Before C++/CLI, this termination would have left programs without cleaning up after themselves, but if you code with ref classes, you don t have to worry about this.

Extracts the value of a given HTML attribute. Extracts the value of a given form field. Extracts the value of a given header. Extracts any text that matches the given regular expression. Extracts any text based on a beginning and ending set of criteria. Regular expressions can be used for this extraction rule also. Extracts all hidden fields from a response.

When developing and deploying P2P applications, you face three primary issues: how to achieve end-toend connectivity; how to provide a common foundation consisting of various state data, identity management, and so on, for peers to use when exchanging state; and how to deploy and scale the solution in a secure manner. Each of these is an important piece of the puzzle to enable the P2P solution to work. End-to-end connectivity: Because of the loose and disparate nature of a mesh, from a development and debugging perspective, ensuring that the various peers can seamlessly connect to each other is a challenge. Further complicating is the fact that the peers connecting to the mesh might be using one or more communication technologies. Common foundation: This is the administrative functionality that every P2P application needs in order to manage the various peers on the mesh. This includes identity management, contact management, node discovery, node naming, secure session management, multipeer communication, and so on. Secure and scalable deployment: This is the ability to build on protocols specifically engineered for large-scale deployment, and it provides built-in security.

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