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UDDI is a platform-independent directory protocol for describing services and discovering and integrating business services via the Internet. UDDI is also based on industry-standard protocols such as HTTP XML, SOAP and so on, and it describes the details of the services , , . using WSDL and communicates via SOAP The philosophy behind UDDI is like a traditional yellow pages where you can search for a company, search for the services its offers, and even contact the company for more information. A UDDI entry is nothing but an XML file that details the business and the services it offers. It consists of three parts: the white, yellow, and green pages. The white pages contain details of the company and its contact information. The yellow pages include industry categories based on standardized taxonomies such as the North America Industry Classification System, and so on. The green pages contain the technical details that describe the interface via a WSDL so a consumer has enough information about how to use the service and what is expected. A UDDI directory also includes several ways to search for the services it offers including various filtering options such as geographic location, type of business, specific provider, and so on. Before UDDI was standardized, there was no universal way to know what services were offered by partners or off-the-shelf options. You also have no way to get standard integration and dependencies between providers. The problems that UDDI solves are as follows:

Listing 2-4 is a simple piece of code showing the Boolean type in action. Listing 2-4. Boolean Type in Action using namespace System; // Boolean Fundamental Type in Action void main() { bool a = 18757; // will give a warning but set to true bool b = 0; // false bool c = true; // obviously true bool d = false; // obviously false Console::WriteLine( Console::WriteLine( Console::WriteLine( Console::WriteLine( } Figure 2-5 shows the results of this little program. a b c d ); ); ); );

The .NET Framework class library System::Char is a 16-bit Unicode character, which has a C++/CLI alias of __wchar_t (or wchar_t, if the Zc:wchar_t flag is set on the compiler). Listing 2-5 is a simple piece of code showing the Char type in action.

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You ll now begin to modify the QuickReturns Ltd. application to use transactions. Open the 09\ReliableMessaging\QuickReturnsTransactional solution. We will assume that you are going to sell a stock and log the sale in a database. The two deals will be committed in a single transaction. You ll begin by modifying the client.

Listing 2-5. Char Type in Action using namespace System; // Character Fundamental Type in Action void main() { Char a = L'A'; // character literal 'A' Char b = L'\x0041'; // hex notation for hex 41 which happens to be 'A' Console::WriteLine ( a ); Console::WriteLine ( b ); //Even though I put hex 41 in b, the ASCII 'A' //is printed due to b being a Char } Figure 2-6 shows the results of this little program.

For some, this is a valuable timesaver while for others it is frustrating not to be talking to a fellow person from the outset Perhaps the person s telephone manner was unsatisfactory and may prompt you to complain In software development, the user experience is gaining more prominence, with interfaces being designed around user expectations and desires, rather than being only a thin veneer around software intended to collect data in a prescribed format..

Figure 2-6. Results of Chars.exe Not long ago, all Windows programs used ASCII, an 8-bit, English-only character set. Unfortunately, this was not very helpful for languages such as Chinese, which requires more than the 256-character limit imposed by ASCII. To try to solve this obvious problem, a new encoding protocol was developed called Unicode, within which many character sets could be defined. Unicode uses 16 bits to represent each character instead of ASCII s 8. ASCII is a subset of Unicode.

downloadable from http://msdn.microsoft.com/vstudio/express/sql/download/default.aspx. You must have this installed for the example to work. To install SQL Express, you need the executable. It is recommended that once the download begins, you select the Run option when prompted. Once the download completes, this will automatically launch the installation. It is recommended that you accept the default settings during the installation process. You can find complete details of the installation and additional components at the previously mentioned link. Also, keep in mind that if you have installed Visual Studio 2005 in a non-Express edition, SQL Server Express is installed by default. Please check your local installation to see whether SQL Server Express was already installed as part of your Visual Studio installation.

Caution Traditional C++ programmers must be wary of the C++/CLI alias char, as it is not the same as the .NET Framework s class library Char. A char is an 8-bit ASCII character, whereas a Char is a 16-bit Unicode character.

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