winforms code 128

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I m not entirely convinced C++/CLI developers need another way to synchronize access to an object from multiple threads. As you saw in 18, we already have several. Okay, the ref class lock is extremely easy to use, but so is the Monitor class from which lock gets its synchronization functionality. For those of you who have synchronized objects in C#, you will see a striking resemblance between C# s lock keyword and C++/CLI s ref class lock. I m pretty sure it s no mere coincidence. Like all the other classes in the C++ Support Library, the ref class lock is in the namespace msclr so if you don t add the following, you would need to use msclr::lock to access this ref class: using namespace msclr; You will also need to add this header to the code: #include <msclr/lock.h>

Next, add the following method, which will do the inverse, attempting to read some object data from the specified file:

Figure 2-23. Process template download folder structure The ProcessTemplate.xml file is the root XML file that describes the entire assemblage for the prescribed template, including the subtasks for each of the process plugins. This file has four main segments: <name>: This is the name that is displayed in the drop-down list in the New Team Project Wizard. <description>: This is the description that is displayed in the New Team Project Wizard s Select a Process Template page. <plugins>: This section lists all the plugins used by the New Team Project Wizard to create the team project. The first release offers the following plugin options: Classification Reporting Portal (wizard page) Groups WorkItemTracking VersionControl (wizard page)

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The basic idea with using lock is to create a code scope and place the lock constructor at its beginning. Now everything within that code scope is synchronized for the object used in the lock constructor. When the lock falls out of the scope, the lock s destructor ends the synchronization on the object used in the lock constructor. I recommend that you use a try/catch to ensure that the lock exits the code scope even on an exception. try { lock myLock(syncObject); // Work with syncObject } catch (...) { } // This will catch any type of exception managed or unmanaged

Multiple constructors are available to the ref class lock Three of the constructors cause the lock on the specified object to immediately be attempted These constructors are template<class T> lock(T ^ _object); template<class T> lock(T ^ _object, int _timeout); template<class T> lock(T ^ _object, System::TimeSpan _timeout); The last two of these constructors take a _timeout value An ApplicationException is thrown if a lock acquisition does not occur before the timeout occurs The fourth and last constructor gives developers the ability to control when the lock is acquired using lock s acquire() or try_acquire() methods and released using its release() method template<class T> lock(T ^ _object, lock_later) Both acquire() and try_acquire() have timeout parameter overloads similar to the lock constructor.

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