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I can tell you right now that you will probably never write the following code, but I thought I d show you, so you will be impressed when you see how easy this becomes when we look at gcroot<T> in a couple of chapters. Listing 22-8 shows you how to place a managed data type within an unmanaged data type. Listing 22-8. Managed Inside Unmanaged #include "stdio.h" using namespace System; using namespace System::Runtime::InteropServices; ref class MClass { public: int x; ~MClass() { Console::WriteLine("MClass disposed"); } protected: !MClass() { Console::WriteLine("MClass finalized"); } }; #pragma unmanaged class UMClass { public: void* mclass; ~UMClass() { printf("UMClass deleted\n"); } }; #pragma managed void main() { UMClass *umc = new UMClass(); // Place ref class on unmanaged void* pointer umc->mclass = GCHandle::ToIntPtr(GCHandle::Alloc(gcnew MClass())).ToPointer(); // access int variable x by typecasting void* ((MClass^)GCHandle::FromIntPtr(System::IntPtr(umc->mclass)).Target)->x = 4; // Manage print int variable x Console::WriteLine("Managed Print {0}", ((MClass^)(GCHandle::FromIntPtr(System::IntPtr(umc->mclass))).Target)->x); // Unmanage print int variable x printf("Unmanaged Print %d\n", ((MClass^)(GCHandle::FromIntPtr(System::IntPtr(umc->mclass))).Target)->x); delete umc; } // works with or without this line

This will provide you with a set of performance data you can use to consistently compare performance for the same test run again and again. You can either sample or instrument these tests, but we would recommend you instrument them to be able to perform more accurate comparisons between one run and another.

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When using an external screen, you need to consider how to properly handle when the user plugs in or unplugs a screen. To help with this, UIScreen defines a few notifications that let you know when a screen is connected or disconnected, so you can act accordingly. In this section, we ll extend our VideoToy project so that if a screen is connected, the video you choose will play on it; if you disconnect the screen, the video will continue playing on the device. This will require a bit of extra bookkeeping on our part we'll need to keep track of the currently selected video and its corresponding views, so that we can switch things around as the external screen comes and goes. Start off by editing VideoCell.h, adding a few lines to define a delegate, a protocol the delegate should implement, and a property declaration for movieViewContainer so that we can reach it from other classes.

Holy [your choice of expletive], Batman! I m almost afraid to explain this code I probably don t need to either as you will never use it anyway The idea behind placing a managed data type into an unmanaged data type is to convert a ref class handle into an unmanaged void* The problem is neither pin_ptr<> or interior_ptr<> can pin a ref class On the other hand, the GCHandle value class s static ToIntPtr() method can The IntPtr returned from the ToIntPtr() method has a ToPointer() method, which you use to create a void* Thus you have void* data = GCHandle::ToIntPtr(xxx)ToPointer(); The static GCHandle::ToIntPtr() method takes as a parameter a value class GCHandle To create a value class GCHandle from a ref class, you use the static GCHandle value class s method Alloc().

This gives you GCHandle xxx = GCHandle::Alloc(gcnew ref_handle()) So when you put it all together, you get void* data = GCHandle::ToIntPtr(GCHandle::Alloc(gcnew ref_handle()))ToPointer(); Clear as mud, no So now you have a void* in your unmanaged class that actually points to a managed ref class Great! Or is it How do you access the methods and variables of a void* that points to a ref class The short answer is you can t at least not directly and therefore I need to explain the other half of the code monstrosity in Listing 22-8 What you have to do is to convert an unmanaged void* into a ref class handle This time we need to get the value class GCHandle from a System::IntPtr.

Now that you have seen how to profile applications in the development environment, it is time to understand how to do it in a production environment. Before you begin profiling a production application you should have a good reason for doing so. Any of the standard answers will work: the application runs slowly; the application is using a huge amount of CPU time or memory; the system the application is running on is starting to slow down; etc. So now that you have your good reason for profiling a production application, you need to know how to profile it.

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