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Making calls out of the .NET managed environment to unmanaged DLLs is handled by a mechanism in .NET called P/Invoke (short for Platform Invoke). The basic idea behind P/Invoke is that it finds the DLL and loads it into memory, marshals its arguments (converts from managed format to native format) so that the DLL can understand the call, makes the call to the DLL s function, and then marshals the return value (converts from native format to managed format) so that the managed code understands the results.

VSTS includes five command-line tools that are available to run performance profiles and report the results. These tools and their purpose are listed in Table 14-5.

Marshaling is a topic all to its own so I cover it a little later. But if you are dealing with primitive types (char, wchar_t, short, int, float, double, etc.), you don t need to do anything special in the way of marshaling anyway.

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But before I cover P/Invoke, you should know that you don t need P/Invoke if you are willing to sacrifice safe code, nonprimitive data types, and developing in any language other than C or C++ All you have to do is develop the NET application as you did before NET existed If you don t have preNET experience, here is what I mean One of the powerful features of C++/CLI is that you can mix and match managed and unmanaged C++ code, in most cases, almost effortlessly Listing 23-1 shows an example of a NET console application that uses a third-party DLL written by me (Listing 23-2) and a call to the User32dll s MessageBox You will need to build the DLL before the application in Listing 23-1 will work Listing 23-1 Mixing Managed and Unmanaged Code Without P/Invoke #include "stdafxh" #include "windows.

Performs the instrumentation of the binaries, which can then be deployed to a production machine. Starts and stops the performance profiling. Can also be used to start and stop performance profiling, but contains different options than the VSPerfCmd application (discussed briefly below). Sets CLR environment options so the performance tools can be properly loaded. Creates the performance reports (or a subset of those reports that you see in the IDE).

Then free up one additional resource in dealloc:

h" extern "C" __declspec(dllimport) long square(long value); using namespace System; 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; } As you can see, this code is just some unmanaged and managed C++ code mixed together willynilly If not for the array<> or Console::WriteLine statements, you probably wouldn t even have known that this is a NET application If you have worked with C++ before NET, you should have no problem with this code To get access to the MessageBox function, you need to include windowsh, just as you would in any other Windows application without NET To access the square function, which resides in a DLL, a dllimport function prototype is needed.

Because the MSDN documentation contains detailed information about each of these applications the information will not be re-presented here.

I created the square function within a DLL so that you can see that nothing special is being done behind the scenes with MessageBox Be careful, though, when you create NativeCodedll (shown in Listing 23-2) Do not select any of the CLR type projects Instead, make sure you select the Win32 Project and select DLL in the application settings Or, if you are compiling the example from the command line, use the /LD option like this: cl /LD NativeCodecpp.

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