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Although the TNotify implementation was a brainteaser in some ways, I was pleased at how few troubles I experienced implementing it. If you do want to extend the hook code, be aware that debugging systemwide hooks isn't a simple endeavor. Your best bet is to use remote debugging as I described in 5. The other way you can debug systemwide hooks is to resort to printf-style debugging. Using DebugView from www.sysinternals.com, you can watch all the OutputDebugString calls to see the state of your hook. Implementing TESTREC.EXE With the Tester DLL out of the way, it was time to provide the keystroke and mouse recording capabilities in TESTREC.EXE. When it comes to recording input, there's only one clean way to do it on Windows operating systems: use a journal record hook. There's nothing very exciting about journal hooks except handling the WM_CANCELJOURNAL message properly. When the user presses Ctrl+Alt+Delete, the operating system terminates any active journal record hooks. This makes sense because it would be a pretty serious security breach to allow an application to record the keystrokes that make up the user's password. To handle WM_CANCELJOURNAL in a manner that keeps the implementation details hidden, I used a message filter to monitor for it coming through. You can see all the hook details in HOOKCODE.CPP in the Tester\TestRec directory. 601
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In this section you will nd common items, and their known metadata, that are used when building Visual Studio project les.
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Figure 5-30. The Edit Configuration window for the Mass Mail preferences lets you add a subject prefix or body suffix to the e-mail.
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Start the Group Policy Management console. Right-click the GPO that will contain the new preference item and then click Edit. In the console tree under Computer Con guration or User Con guration, expand the Preferences folder and then expand the Control Panel Settings folder. Right-click Devices, point to New, and select Device. In the New Device Properties dialog box, select Use This Device (Enable) or Do Not Use This Device (Disable) from the Action drop-down list. Enter the Device settings. (See Table 20-7 for descriptions.) Click the Common tab and select the desired options. (For more information, see the section titled Con guring Common Options earlier in this chapter.) Click OK. The new preference item appears in the details pane.
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Triggering a Task at Logon Logon tasks can be set for any user or a specific user or user group. If the user whose logon has triggered the task is not the user in whose security context the task is running, the task will be non-interactive in other words, essentially invisible. (The user can note the presence of the task and terminate it by running Windows Task Manager, going to the Processes tab, clicking Show Processes From All Users, and answering the UAC prompt.) Triggering a Task at Startup If you set a task to be triggered at startup, the trigger takes effect when you start your own computer (assuming you have Task Scheduler set to configure the local machine), but before you log on. Therefore, if you intend for the task to run on your own system, be sure to choose Run Whether User Is Logged On Or Not, on the General tab of the Create Task dialog box. Otherwise the task will never run. If you use the Change User Or Group button on the General tab to specify another user on your domain, and you choose Run Only When User Is Logged On, the startup-triggered task will run on the remote system when you restart your own, provided the specified user actually is logged on. Triggering a Task on Idle If you set a task to be triggered when your computer is idle, you should also go to the Conditions tab of the Create Task dialog box to specify what you mean by idle. For information about how Scheduled Tasks defines idleness, see Starting and Running a Task Only If the Computer Is Idle, later in this chapter. Note that you only need to set an idle trigger on the Trigger tab if idleness is the only trigger you want to use. If you re setting one or more other triggers but you want to ensure that the task starts only when the computer is idle, select the Start The Task Only If The Computer Is Idle For check box on the Conditions tab. Using an Event to Trigger a Task One of the most powerful new features of the Windows Vista Task Scheduler is the ability to have tasks triggered by events. Anything that generates an item in an event log can serve as a task trigger. (For information about events and event logs, see 22, Monitoring System Activities with Event Viewer. ) The simplest way to use this feature is to launch the Event Viewer snap-in (Eventvwr. msc), find the event that you want to use as a trigger, right-click it in Event Viewer, and choose Attach Task To This Event. This action launches the Create Basic Task Wizard, with the trigger portion of the wizard already filled out. The new task appears in a folder called Event Viewer Tasks (newly created for you if it doesn t already exist), and you can modify it if needed by selecting it there and opening its properties dialog box. It s possible, of course, to create an event-driven task directly in Task Scheduler by selecting On An Event in the New Trigger dialog box. If you set up the task in this fash-
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Inside Microsoft SQL Server 2008: T-SQL Programming
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---------------------------------------------------------------------- Stored Procedure: AddEmp, -Inserts new employee who manages no one into the table --------------------------------------------------------------------IF OBJECT_ID('dbo.AddEmp', 'P') IS NOT NULL DROP PROC dbo.AddEmp; GO CREATE PROC dbo.AddEmp @empid AS INT, @mgrid AS INT, @leftempid AS INT, @rightempid AS INT, @empname AS VARCHAR(25) , @salary AS MONEY = 1000 AS DECLARE @hid AS HIERARCHYID; IF @mgrid IS NULL SET @hid = hierarchyid::GetRoot(); ELSE SET @hid = (SELECT hid FROM dbo.Employees WHERE empid = @mgrid).GetDescendant ( (SELECT hid FROM dbo.Employees WHERE empid = @leftempid), (SELECT hid FROM dbo.Employees WHERE empid = @rightempid) ); INSERT INTO dbo.Employees(empid, hid, empname, salary) VALUES(@empid, @hid, @empname, @salary); GO
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Sorting is a presentation request and usually is used by the client rather than the server. This means that you might want the sorting of hierarchies to take place on the client. In this section, however, I'll present server-side sorting techniques with T-SQL that you can use when you prefer to handle sorting on the server. A topological sort of a DAG is defined as one that provides a child with a higher sort value than its parent. Occasionally, I will refer to a topological sort informally as "correct hierarchical sort." More than one way of ordering the items in a DAG may qualify as correct. You might or might not care about the order among siblings. If the order among siblings doesn't matter to you, you can achieve sorting by constructing an enumerated path for each node, as described in the previous section, and sort the nodes by that path. Remember that the enumerated path is a character string made of the IDs of the ancestors leading to the node, using some separator. This means that siblings are sorted by their node IDs. Because the path is character based, you get character-based sorting of IDs, which might be different than the integer sorting. For example, employee ID 11 will sort lower than its sibling with ID 9 ('.' < '.'), even though 9 < 11. You can guarantee that sorting by the enumerated path will produce a correct hierarchical sort, but it will not guarantee the order of siblings. If you need such a guarantee, you need a different solution. For optimal sorting flexibility, you might want to guarantee the following: 1. A correct topological sortthat is, a sort in which a child will have a higher sort value than its parent's. 2. Siblings are sorted in a requested order (for example, by empname or by salary). 3. Integer sort values are generated, as opposed to lengthy strings.
void M3() { Employee e; Int32 year; e = new Manager(); e = Employee.Lookup("Joe"); year = e.GetYearsEmployed(); e.GenProgressReport(); }
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