winforms data matrix

winforms data matrix

winforms data matrix

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If you code the TryEnter() method to continue into the Monitor area, even if the area is blocked, be prepared for the program to not work properly To set the end of the Monitor area, you use the static Exit() method, which has the following syntax: static void Exit(Object^ MonitorObject); Not much to say about this method other than once it s executed, the Monitor area blocked by either the Entry() method or the TryEnter() method is opened up again for another thread to enter In most cases, using these three methods should be all you need For those rare occasions, the Monitor provides three additional methods that allow another thread to enter a Monitor area even if it s currently occupied The first method is the Wait() method, which releases the lock on a Monitor area and blocks the current thread until it reacquires the lock.

To reacquire a lock, the block thread must wait for another thread to call a Pulse() or PulseAll() method from within the Monitor area The main difference between the Pulse() and PulseAll() methods is that Pulse() notifies the next thread waiting that it s ready to release the Monitor area, whereas PulseAll() notifies all waiting threads Listing 18-9 shows how to code threads for a Monitor The example is composed of three threads The first two call synchronized Wait() and Pulse() methods, and the last thread calls a TryEnter() method, which it purposely blocks to show how to use the method correctly Listing 18-9 SyncByMonitorcpp Synchronizing Using the Monitor Class using namespace System; using namespace System::Threading; ref class MyThread { static Object^ MonitorObject = gcnew Object(); public: void TFuncOne(); void TFuncTwo(); void TFuncThree(); }; void MyThread::TFuncOne() { Console::WriteLine("TFuncOne enters monitor"); Monitor::Enter(MonitorObject);.

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for (Int32 i = 0; i < 3; i++) { Console::WriteLine("TFuncOne Waits {0}", i.ToString()); Monitor::Wait(MonitorObject); Console::WriteLine("TFuncOne Pulses {0}", i.ToString()); Monitor::Pulse(MonitorObject); Thread::Sleep(1); } Monitor::Exit(MonitorObject); Console::WriteLine("TFuncOne exits monitor"); } void MyThread::TFuncTwo() { Console::WriteLine("TFuncTwo enters monitor"); Monitor::Enter(MonitorObject); for (Int32 i = 0; i < 3; i++) { Console::WriteLine("TFuncTwo Pulses {0}", i.ToString()); Monitor::Pulse(MonitorObject); Thread::Sleep(1); Console::WriteLine("TFuncTwo Waits {0}", i.ToString()); Monitor::Wait(MonitorObject); } Monitor::Exit(MonitorObject); Console::WriteLine("TFuncTwo exits monitor"); } void MyThread::TFuncThree() { if (!Monitor::TryEnter(MonitorObject)) { Console::WriteLine("TFuncThree was not able to lock"); return; } Console::WriteLine("TFuncThree got a lock"); Monitor::Exit(MonitorObject); Console::WriteLine("TFuncThree exits monitor"); } void main() { MyThread ^myThr1 = gcnew MyThread(); (gcnew Thread(gcnew ThreadStart(myThr1, &MyThread::TFuncOne)))->Start(); Thread::Sleep(2); (gcnew Thread(gcnew ThreadStart(myThr1, &MyThread::TFuncTwo)))->Start(); Thread::Sleep(2);

to be displayed simultaneously may be useful in situations where you want to let the user quickly change multiple settings or attributes. For example, in a word processing app, you might want to let the user open two popovers: one for selecting from a list of fonts, and one for toggling attributes (bold, italics, underline, and so on). NOTE: Apple recommends against displaying multiple popovers at once, in order to avoid confusing your users, so think twice before going that route. In Dudel, we re going to allow for only one popover at a time by keeping an instance variable in DudelViewController that points at the current popover, and taking steps to make sure that it s properly managed. Start off by editing DudelViewController.h, adding the following code shown in bold. In addition to adding the instance variable (and its matching property declaration), here we re also adding UIPopoverControllerDelegate to the list of protocols this class implements.

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