winforms qr code

winforms qr code

winforms qr code

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The System::Threading::ReaderWriterLock class is a little different from the previous two types of synchronization in that it uses a multiple-reader/single-writer mechanism instead of the all-ornothing approach. What this means is that the ReaderWriterLock class allows any number of threads to be in a block of synchronized code so long as they are only reading the shared resource within it. On the other hand, if a thread needs to change the shared resource, all threads must vacate the region and give the updating thread exclusive access to it. This type of synchronization makes sense because if a thread isn t changing anything, it can t affect other threads. So, why not give the thread access to the shared resource The ReaderWriterLock class is similar to both the Monitor class and the Mutex class. You specify a region to be synchronized and then have the threads block or pass into this area based on whether an update is happening in the region. As with the Mutex class, you create an instance of the ReaderWriterLock class and work with its member method. To create an instance of the ReaderWriterLock object, you call its default constructor: ReaderWriterLock(); Once you have a ReaderWriterLock object, you need to determine whether the region of code you want to block will do only reading of the shared resource or if it will change the shared resource. If the region will only read the shared resource, use the following code to set the region as read-only: void AcquireReaderLock(int milliseconds); void AcquireReaderLock(TimeSpan span);

1. Drag an Enum from the Toolbox onto the design surface. This will bring up the New Enum dialog box. 2. For this enumeration, set the name to PasswordType. Notice that a code file named PasswordType.cs (or PasswordType.vb, depending on the language) is also added to the solution, as shown in Figure 11-7. Click OK to add the enumeration.

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Reference class types: A user-defined grouping of types and methods Delegates: A type that holds a reference to a method Enumerations: A list of named integer constants Interface types: A class type where all methods are abstract Handle types: A reference to a type User-defined value types: User-defined expansion to the standard, primitive value types A point worth mentioning is that the CTS defines all .NET-compatible language data types, but a .NET-compatible language does not need to support all CTS-defined data types. In versions prior to .NET 2.0, even Microsoft Visual Basic .NET did not support all data types. This has changed since .NET version 2.0, as you can see in the comparison of the built-in value and reference types supported by Visual Basic 2008, C#, and C++/CLI (Table 1-1).

System::Byte System::Sbyte System::Int16 System::Int32 System::Int64 System::UInt16 System::UInt32 System::UInt64 System::Single System::Double System::Object System::Char System::String System::Decimal System::IntPtr System::UIntPtr System::Boolean

A handful of well-known developers were kind enough to share their insights about developing apps for the iPad platform. In taking a closer look at these apps, several iPad-specific user interface elements and concepts are mentioned. If you re unfamiliar with any of them, don't worry. All of the new iPad frameworks and user interface controls available in iPhone SDK 3.2 will be thoroughly explained throughout the rest of the book, starting with 3.

Figure 11-7. The New Enum dialog box 3. The Class Details window switches to have only four columns: Name, Value, Summary, and Hide. Enter the information in Table 11-4 into the Class Details window.

Byte SByte Short Integer Long UShort UInteger ULong Single Double Object Char String Decimal IntPtr UIntPtr Boolean

byte sbyte short int long ushort uint ulong float double object char string decimal IntPtr UIntPtr bool

Summary

unsigned char char short or __int16 int, long or __int32 long long or __int64 unsigned short or unsigned __int16 unsigned int, unsigned long or unsigned __int32 unsigned long long or unsigned __int64 float double Object^ __wchar_t String^ Decimal IntPtr UIntPtr bool

Steve Sprang s acclaimed iPhone app, Brushes (http://brushesapp.com/), is a painting program designed exclusively for the mobile screen. With a deceptively simple interface, Brushes is packed with features, such as an advanced color picker, several realistic brushes, multiple layers, extreme zooming, and even undo/redo options. It is a powerful tool for painting on the iPhone, which has spawned a vast community of mobile digital artists. Choosing a new color or a different brush requires moving to a new screen view. Due to the iPhone s small size, this is a necessary design strategy to keep the user interface uncluttered and easy to use. Once a selection is made, the artist can then return to the main canvas screen (see Figure 1 3).

It is not necessary to enter a value for an enumeration, because the default is to have them sequenTip

The ^ character in Table 1-1 is not a typo. This is C++/CLI s new handle symbol, which I will cover in 2.

You should take care when using UInt64, as unpredictable results are possible on Intel 32-bit platforms because they are not thread-safe and do not load the registers atomically.

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