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Listing 23-2. A Very Simple Native Code DLL #include "stdafx.h" #include "string.h" extern "C" __declspec(dllexport) long square(long value) { return value * value; } To get Listing 23-1 to compile, you need to change the program s properties so that the Linker knows where the User32.lib and NativeCode.lib files are located. To do this, you just replace $(NoInherit) with the path to NativeCode.lib, as seen in Figure 23-1. This kills two birds with one stone. Removing $(NoInherit) causes User32.lib to be added to the link, while replacing it with the path to NativeCode.lib does the same for NativeCode.lib. These .lib files in turn provide information to the compiler on how to interface with their corresponding .dll files.

- (void)dealloc { self.urlPath = nil; self.mpc = nil; self.movieViewContainer = nil; [super dealloc]; }

To find information about these applications in the MSDN documentation, go to its table of contents, Tip navigate to Visual Studio Team System Team Edition for Developers Analyzing Application Performance Command-Line Tools.

Figure 23-1. Updating Linker properties Once you successfully compile the console application and the DLL, you can now execute the example. You should get something similar to Figure 23-2.

If when executing DllOldWay.exe you get the error saying can t find NativeCode.dll , then move NativeCode.dll someplace that the CLR can find it. I moved it to the same directory as DllOldway.exe.

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By Windows applications, we mean any application deployed to a machine. This can be one part of an application (i.e., the front end of a distributed application, a console application, or a custom server) or the complete application. It does not include Windows services or ASP.NET applications. Windows services are discussed at the end of this section because the steps are only slightly different for a Windows service than for a Windows application. For this example, the application being instrumented is the console application presented in Listing 14-1. It was compiled using the Release configuration. The application name is PerformanceInstrumentationExample and it is located in the root of drive C (C:\). To profile this application using instrumentation, take the following steps (sampling is described afterward): 1. Open the Visual Studio Command Prompt. 2. Navigate to the Performance Tools location (the default installation is C:\Program Files\Microsoft Visual Studio 8\Team Tools\Performance Tools). 3. Run the following (use /globalsampleon to run sampling performance tests): vsperfclrenv /globaltraceon This sets up the CLR to enable the loading and running of performance tools.

Figure 23-2. DllOldWay.exe in action 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.

Next, implement the following change, to let the delegate know when the video has been selected. This way, the view can be shifted to the external screen (if it's connected).

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 23-1, shown in Listing 23-3. Listing 23-3. 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);

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