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In the UnderscorePrefixRule, the Check method does the following: Check to see if the member being examined is a public member If it is, the rule is skipped because we want to check only private fields If the type of the member is a field, continue with the check; otherwise, skip the rule If the member name does not start with an underscore, continue with the check; otherwise, skip the rule If the rule was broken, format the member name for display (RuleUtilities is a method in the FxCop SDK for formatting output) and set any values that are needed by the resolution string Get the resolution text from the rule information file and pass it any parameters (in this case, the name of the rule) (Resolutions are discussed in the next section) Create a new Problem object and pass it the resolution of the problem.

This chapter assumes that you know how to code, register, etc., your own COM objects and will not cover those topics.

Note For the build steps and these batch files to work, Visual Studio 2010 must be installed in the default path.

Add the Problem to the Problem collection and exit the method This is a fairly straightforward example, but these rules can become extremely complicated and detailed..

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I am including (just for completeness) Listing 21-8, the COM component that I use for all of the examples to follow. As you can see, it is simply a COM-ification of NativeCode.dll from Listing 21-2. Listing 21-8. The s Test COM Component TestCOM // Compile from command line using // cl /LD TestCOM.cpp // regsvr32 TestCOM.dll #define _ATL_ATTRIBUTES #include <atlbase.h> #include <atlcom.h> [module(name="TestCOM",type="dll")]; // ITestCOM interface with Square method [dual] __interface ITestCOM : IDispatch { [id(0x01)] HRESULT Square([in]LONG Value, [out,retval]LONG* Result); }; // coclass CTestCOM implements the ITestCOM interface [coclass, threading="both"] class CTestCOM : public ITestCOM { HRESULT Square(LONG Value, LONG* Result) { if (Value > 0x0ffff) { *Result = -1; return E_INVALIDARG; } else { *Result = Value * Value; return S_OK; } } };

To put it bluntly, COM objects and .NET objects are quite different and I m impressed by the magic invoked by Microsoft to get these square pegs into round holes. This magic is the Interop Assembly. Best of all, you don t have to write a single line of code to create an Interop Assembly! An Interop Assembly is usually known as a runtime callable wrapper (RCW) because of the functionality it provides. As this name suggests, a RCW is a managed wrapper assembly that enables .NET to understand a COM object at runtime. In other words, not only does it provide marshaling code for parameters and return values, it also does all the prep work required to get the COM object up and running, manages the lifetime of the COM object (I know I don t miss trying to keep the AddRef() and Release() method calls in sync!), identifies and provides interfaces to the members of the COM object, and allows .NET to access these COM object members via dynamic references instead of raw fixed pointers.

The rule file contains all of the details regarding the rule that was broken. By default, the rule file is named Rules.xml and is an embedded resource file within the project. Typically, there is one rule file per assembly, and all of the rule information goes in this file. The schema for this file is shown in Listing 13-10.

If you chose a different path or haven t installed Visual Studio 2010, you need to update the path to the utilities as required.

Caution With an RCW, you do not have control of when its COM object is garbage collected. On the other hand, you may have heard of the static method System::Runtime::InteropServices::Marshal:: ReleaseComObject(), which you can use to immediately release your RCW. It is true that this method exists, but you must use it with extreme caution (and I mean extreme) as you are removing yourself from the safety net that .NET provides. The ReleaseComObject() method is a very complex topic and I will not cover it further, but if you insist on using the method, make sure you understand completely how it works (there are many Web pages about it) and then test thoroughly.

Note The schema in Listing 13-10 is not complete. Microsoft has yet to release documentation for the

The process of setting a class up for serialization is probably one of the easiest things that you can do in C++/CLI. You simply place the [Serializable] attribute in front of the managed object you want to serialize. Yep, that is it! [Serializable] ref class ClassName { //... };

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