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Although the Windows API allows you to access low-level functions of the Microsoft Windows operating system, it can also be useful to access functions made available by programs available on the system. The technology that makes this possible is called Windows Automation. Windows Automation provides a way for programs to trigger one another s features and to automate certain functions among themselves. Access to Windows Automation is provided by Ruby s WIN32OLE (also included in the standard library). If you re already familiar with Windows Automation, COM, or OLE technologies, Ruby s interface will feel instantly familiar. Even if you re not, this code should be immediately understood: require 'win32ole' web_browser = WIN32OLE.new('InternetExplorer.Application') web_browser.visible = true web_browser.navigate('http://www.rubyinside.com/') This code loads the WIN32OLE library and creates a variable, web_browser, that references an OLE automation server called 'InternetExplorer.Application'. This server is provided by the Internet Explorer web browser that comes with Windows, and the OLE automation server allows you to control the browser s functions remotely. In this example, you make the web browser visible before instructing it to load up a certain web page. WIN32OLE does not implement the visible and navigate methods itself. These dynamic methods are handled on the fly by method_missing (a special method that is run within a class whenever no predefined method is found) and passed to the OLE Automation server. Therefore, you can use any methods made available by any OLE Automation server directly from Ruby! You can extend this example to take advantage of further methods made available by Internet Explorer: require 'win32ole' web_browser = WIN32OLE.new('InternetExplorer.Application') web_browser.visible = true web_browser.navigate('http://www.rubyinside.com/') while web_browser.ReadyState != 4 sleep 1 end puts "Page is loaded"

Notice in the code that C# allows you to use fairly simple syntax to initialize the two Nullable<Int32> variables, x and y . In fact, the C# team wants to integrate nullable value types into the C# language, making them first-class citizens . To that end, C# offers an (arguably) cleaner syntax for working with nullable value types . C# allows the code to declare and initialize the x and y variables to be written using question-mark notation:

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For more complex operations, realistically nothing compares to XML DOM parsers Designing a Writer on Top of a Reader In the NET Framework, the XML DOM classes make intensive use of streaming readers and writers to build the in-memory tree and to flush it out to disk Thus, readers and writers are definitely the only XML primitives available in the NET Framework Consequently, to build up a sort of lightweight XML DOM parser, we can only rely, once more, on readers and writers 148.

The previous code produces the following output:

1 2 3 4 5 The easiest way to understand this is that the code between { and } (or, potentially, do and end, remember ) is the code being looped upon. At the start of that code, the number from the 1 up to 5 count is sent down a chute into a variable called number. You can visualize the chute with the bars surrounding number. This is how parameters are passed into blocks of code that don t have specific names (unlike methods on classes and objects, which have names). In the preceding line of code, you ask Ruby to count from 1 to 5. It starts with 1, which is passed

Figure 6-10 If you find the Organize Favorites dialog box confining, you can reorganize your favorites in Windows Explorer instead.

static void Main() { Application.Run(new SimpleForm()); }

<Target Name="Demo"> <MetadataExample ServerList="@(Server)"> <Output ItemName="ServerIpList" TaskParameter="Result" /> </MetadataExample> <Message Text="ServerIpList: @(ServerIpList)" /> <Message Text="Server: %(ServerIpList.ServerName) %(ServerIpList.DropLoc) %(ServerIpList.IpAddress)" /> </Target> </Project>

fb(val);

Service Name Eventlog MpsSvc Stisvc MSIServer Winmgmt Mcx2Svc ehRecvr ehSched ehstart WMPNetworkSvc TrustedInstaller FontCache3 .0 .0 .0 WinRM WSearch W32Time wuauserv

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shipperid as the key column and also contains the custid column, and the index PK_Orders contains the orderid column. The optimizer used the access method nonclustered index seek + ordered partial scan to obtain the relevant data from idx_nc_sid_od_i_cid, and it used an unordered nonclustered index scan to obtain the relevant data from PK_Orders. It then intersected the two sets based on the row locator values; naturally, row locator values pointing to the same rows will be matched. You can think of index intersection as an internal join based on a match in row locator values. Here are the performance measures that I got for this query:

Because MEF allows you to discover modules at run time, you may also discover new dependencies between modules at run time. Although you can use MEF with the ModuleCatalog, it is important to remember that the ModuleCatalog validates the dependency chain when it is loaded from XAML or configuration (before any modules are loaded). If a module is listed in the ModuleCatalog and then loaded using MEF, the ModuleCatalog dependencies will be used, and the DependsOnModuleNames attribute will be ignored. Using MEF with a ModuleCatalog is most common in Silverlight applications that have modules in separate .xap files. Using MEF to Specify On-Demand Loading If you are using MEF and the ModuleExport attribute to specify modules and module dependencies, you can use the InitializationMode property to specify that a module should be loaded on demand, as shown in the following example.

Windows privileges determine what a security principal can do on given computer. (In other words, privileges are not tied to a particular securable object.) Windows Server 2008 has 35 different privileges (SeImpersonatePrivilege, SeCreateGlobalPrivilege, and so on) that can be assigned to a security principal. The list of possible privileges is shown in Table 6-2. You can also see the various privileges in Group Policy at \Computer Configuration\Windows Settings\Security Settings\Local Policies\User Rights Assignments. However, the latter also includes nine rights that are not considered privileges.

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