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So if you don t need P/Invoke, why I am I even covering it Whoa there! Remember those restrictions I mentioned earlier You cannot compile the previous example using /clr:safe, so you can t generate safe code. Things become far from trivial when dealing with factors like ref classes or String objects. And you can probably completely forget about interfacing with Visual Basic, Pascal, or other languages since they do things like change the order in which tasks are done when calling a function and use a different format of the basic data types.

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Once it s registered in the GAC, you can then install it in COM+. .NET offers a useful command-line utility that does all the work for you. The following command creates the COM+ application along with registering the .NET assembly s components: regsvcs bin\debug\OldHorse2.dll You can provide the assembly with Enterprise Services types that control the COM+ registration, as shown in Listing 10 8. In this way, you don t have to build the application first and install the components through the wizard. If you want execute the same functionality outside of .NET or for non.NET components, you can leverage the COM+ administrative interfaces for controlling COM+ applications. Listing 10 8. OldHorse2 Assembly Attributes for COM+ [assembly: [assembly: [assembly: [assembly: [assembly: ComVisible( true )] Guid( "c41f4ee8-3475-47b6-b381-5e7774e4287d" )] ApplicationName("OldHorse2")] ApplicationActivation(ActivationOption.Library)] ApplicationAccessControl(false)]

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What if you are not willing to sacrifice safe code, nonprimitive data types, or multilanguage development when interfacing with your DLLs Well, then you need to use P/Invoke. The code to implement P/Invoke is rather easy. Selecting the correct arguments to use when implementing P/Invoke, on the other hand, can get a bit tricky, but usually the complication revolves around marshaling, which I m discussing a bit later. Let s take a look at the P/Invoke equivalent to Listing 21-1, shown in Listing 21-3. Listing 21-3. A Simple P/Invoke Console Application #include "stdafx.h" using namespace System; using namespace System::Runtime::InteropServices; [DllImportAttribute("..\\Debug\\NativeCode.dll", CallingConvention=CallingConvention::StdCall)] extern "C" long square(long value);

[DllImport("User32.dll", CharSet=CharSet::Auto, CallingConvention=CallingConvention::StdCall)] extern "C" int MessageBox(int hWnd, String^ text, String^ caption, unsigned int type); int main(array<System::String ^> ^args) { long Squareof4 = square(4); Console::WriteLine(L"The square of 4 is {0}", Squareof4); MessageBox(0, L"Hello World!", L"A Message Box", 0); return 0; } One nice thing about P/Invoke is that you don t have to go into the project s properties and change settings. Instead, all the information needed to compile and link is included in the source code. Therefore, you can simply compile the previous code and when you execute it you get the same result as shown in Figure 21-3.

Notice that, by default, all of the rules have a status of Warning. You can change the status to Error simply by double-clicking the status for the rule (and double-click Error to change it back to Warning). This allows you to mark rules as errors, which will prevent your code from running after a build if certain rules are violated. Again, this will depend on the specific requirements of your project or organization. You can disable rule checking on certain rules or on all rules by unchecking the box next to the specific rules or categories.

These commands are best executed from the Windows SDK command (located in the Tools folder) or the Visual Studio 2010 command prompt (select Start All Programs). Additionally, the commands are contained in the batch files previously mentioned. Once registered, you should see the OldHorse2 application in Component Services, as shown in Figure 10 13.

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