winforms pdf 417

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To specify the end of the Mutex region, you use the Mutex class s ReleaseMutex() member method. Just like Monitor s Enter() and Exit() method combination, you need to match WaitOne() calls with ReleaseMutex() calls. Listing 18-11 shows how to code a multithreaded single process. There is nothing special about it. In fact, I would normally just use a Monitor. Where this example really shines is when it is used in conjunction with MutexSpawn.exe, as it shows the Mutex class s real power of handling mutually exclusive regions of code across processes.

You will start the class diagramming process by creating the basic building blocks of the service. The first task is to add a simple enumeration, which will allow the consumer of the service to specify whether the password that is being passed in the ValidateUser method (which you will create shortly) is encrypted or in plain text.

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Listing 18-11. SyncByMutex.cpp Synchronizing Using the Mutex Class using namespace System; using namespace System::Threading; ref class MyThread { static Mutex ^m = gcnew Mutex(false, "SyncByMutex"); public: static void ThreadFunc(); }; void MyThread::ThreadFunc() { Random^ Rand = gcnew Random; Thread ^thr = Thread::CurrentThread; for (int i = 0; i < 4; i++) { m->WaitOne(); Console::WriteLine("{0} Enter - {1}", thr->Name, i); Thread::Sleep(Rand->Next(20, 100)); // Simulate Work Console::WriteLine("{0} Exit - {1}", thr->Name, i); m->ReleaseMutex(); Thread::Sleep(Rand->Next(20, 100)); } } int main(int argc, char *argv[]) { MyThread ^myThr = gcnew MyThread(); Thread ^thr1 = gcnew Thread(gcnew ThreadStart(&MyThread::ThreadFunc)); Thread ^thr2 = gcnew Thread(gcnew ThreadStart(&MyThread::ThreadFunc)); thr1->Name = String::Format("Process {0} - Thread 1", gcnew String(argv[1])); thr2->Name = String::Format("Process {0} - Thread 2", gcnew String(argv[1])); thr1->Start(); Thread::Sleep(50); thr2->Start(); } Because you ve already seen how to use the Monitor, the preceding example should be quite straightforward. The only real difference (other than the names of the methods being different, of course) is that the Mutex uses an instance object and member method calls, and the Monitor uses static method calls. Figure 18-12 shows SyncByMutex.exe in action. Notice that threads in both processes are blocked and get access to the named Mutex region. Also notice that every enter line has a corresponding exit line printed before a new thread takes over the Mutex region.

Caution Obviously, you would never send a password in clear text in a real application, but this provides

Passing arguments to the main() function is unsafe code as it uses pointers to pass the values. You need to use the /clr compiler option.

Knowing that iPad users won t be content with running blown-up, pixelized iPhone apps, developers are racing to port their existing iPhone apps into new, enhanced iPad versions. Their efforts go far beyond simply scaling the interface to accommodate the larger screen real estate. Major changes to app navigation and user interface architecture are being implemented to take advantage of the iPad s unique software and hardware features. There are several important design methodologies and recommended interface guidelines to consider when developing apps for the iPad, all of which will be discussed in great detail in 3. For now, it s time for a little inspiration to get the creative juices flowing. Let s take a look at how several iPhone developers are retooling their apps for the iPad.

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