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Windows 7 gesture support offers an easy-to-use yet powerful technology that allows you to enhance your applications, creating compelling multitouch experiences. However, the supported Windows 7 multitouch gestures, described in the previous chapter, have their limitation. For example, the Windows 7 multitouch gestures that ship in box have a limitation on the total number of supported touch points: All gestures support a maximum of only two simultaneous touch points. Another limitation is the inability to combine gestures, meaning you can t perform rotate and zoom gestures on a given object at the same time. There is no way to receive both GID_ROTATE and GID_ZOOM messages to handle a combined event. Therefore, when you want to provide richer multitouch experiences in your application, you need to choose the richer multitouch API. Using this API you need to handle touch messages and interpret the performed gestures yourself rather than relying on the default gestures engine provided in Windows 7. The default gestures engine the Windows Ink Services Platform Table Input Subsystem (WISPTIS) described in the previous chapter is the engine that sends the default gesture messages.

4. At the command prompt, re-sign the partially signed assembly by issuing the following command:

Much like the CLR stored procedure, a scalar UDF consists of a single method. The difference is that for the UDF, the method needs to return a value, whereas for the stored procedure, the method should return void (for C#) or be a Sub (for Visual Basic .NET). UDFs are where SQLCLR really excels because you can easily create UDFs that let you use basically anything within the .NET Framework. You should typically use a CLR UDF only to perform computations, that is, not to access any tables. Your functions are then typically used in an SQL DML statement. In this example, we create a UDF that allows you to use regular expressions in SQL Server. Using regular expressions is an often-needed feature that does not exist natively in SQL Server but that you can easily steal from the .NET Framework using SQLCLR. In the following examples, we do not cover compiling or loading the assembly because those steps were covered earlier in this lesson.

Creating a Serviced Component . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 517

Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.

Implementing, Managing, and Maintaining Routing And Remote Access (4.0)

You will need to download and install a sample database for Adventure Works, a fictional retailer that is referenced in some of the labs in this book. To install the sample database, refer to the following instructions: 1. Browse to http://msdn.microsoft.com/vstudio/express/sql/default.aspx and click the Download icon. 2. Select the SQL Server 2005 Samples download and follow the instructions on the download page to save the case-insensitive collation DB installation package (AdventureWorksDBCI.msi) to your local development machine. 3. Once the installation package has finished downloading, double-click the executable file and click Run to execute the Installer. 4. Click Next in the Welcome dialog box.

The skills that you need to successfully master the Configuring Application Security objective domain on the Supporting Users and Troubleshooting Desktop Applications on a Microsoft Windows XP Operating System exam include:

4

Configuring and Troubleshooting Hardware Devices and Drivers (3.0)

Catch ex As Exception MessageBox.Show(ex.Message) Finally tr.Close() End Try Catch ex As Exception MessageBox.Show(ex.Message) End Try // C# try { TextReader tr = new StreamReader(locationTextBox.Text); try { displayTextBox.Text = tr.ReadToEnd(); } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { tr.Close(); } } catch (Exception ex) { MessageBox.Show(ex.Message); }

Users might decide that some posts or newsgroup participants are not desirable or use ful and might ask you to block those senders or messages. Blocked messages go directly to the Delete folder and are not displayed. To block messages from a sender or a domain, follow these steps: 1. Open the newsreader, and from the list of messages in a newsgroup, open a mes sage from the sender to block. 2. Click Message, and click Block Sender. Click OK to block all messages from that sender.