c# qr code encoder Part 3: Customizing Windows in C#

Creator QR Code 2d barcode in C# Part 3: Customizing Windows

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Tip Use a batch program to schedule sequential tasks When you have a group of tasks you want to perform periodically, you can create a scheduled task for each one and modify its properties to suit your needs. Doing so, however, makes it difficult to ensure that the tasks run in a certain order or that one task doesn t start until a prerequisite task is complete. For example, you might want to remove unneeded files from your hard drives, defragment each one, and then back them up. The most reliable method in such a case is to combine the command line for each task in a batch program and then create a scheduled task that runs the batch program. This has one other advantage: If you need to change scheduled task properties say, to modify the schedule or enter your new logon password you need to apply that change to only one task.
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Part 3: Customizing Windows
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Microsoft Windows XP Inside Out, Second Edition
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Figure 15-2. Click Advanced on the Schedule tab to produce the Advanced Schedule Options dialog box, where you can set end dates and recurrence parameters.
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On the Settings tab, shown in Figure 15-3, you can provide a termination order for a task that has run too long, stipulate that a task not run if the computer is in use at the scheduled time (or stop running if someone begins using the computer), and tell the system not to run a task if the computer is running on battery power. On ACPI-compliant computers, the Power Management section of this dialog box includes a Wake The Computer To Run This Task check box. Selecting this check box ensures that your task will run at the scheduled time, even if the computer is in standby at the time. (For information about ACPI, see ACPI vs. APM, page 506.) On the Settings tab, you can also select a check box that will remove the task object from the Scheduled Tasks folder if, on the current schedule, it s never going to run again.
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Figure 15-3. The Settings tab of a task s properties dialog box provides power-management control and other useful options.
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Part 3: Customizing Windows
Automating Windows XP Note
A computer is considered to be idle when there s no keyboard or mouse activity.
Restricting the Task Scheduler with Policies
The Task Scheduler node in the Group Policy console (Gpedit.msc) includes seven policies that you can use to curtail features relating to scheduled tasks. These policies are listed in Table 15-1. (The Group Policy console is available in Windows XP Professional only.)
Table 15-1.
Task Scheduler Policies
Effect When Enabled
Simplifies the Scheduled Task Wizard by eliminating the option to set advanced scheduling properties. Prevents users from viewing and changing the properties of new and existing tasks, including their schedules, Run As accounts, and passwords. Prevents users from running or stopping a task manually. Prevents users from creating a task by dragging an executable to the Tasks folder. Eliminates the Add Scheduled Task item from the Tasks folder. Administrators can still use the Schtasks command to create new tasks. Prevents users from deleting tasks from the Tasks folder. Administrators can still use the Schtasks command to delete tasks. Eliminates the Browse button from the Scheduled Task Wizard and from the Task tab of a task s properties dialog box.
Policy
Hide Advanced Properties Checkbox in Add Scheduled Task Wizard Hide Property Pages
Prevent Task Run Or End Prohibit Drag-and-Drop Prohibit New Task Creation
Prohibit Task Deletion
Prohibit Browse
Note the following:
All of the policies affect task scheduling via the Scheduled Tasks folder only. None of
them restrict users ability to use the Schtasks command (described in the next section).
Hide Property Pages prevents users from changing the characteristics of tasks once
they have been scheduled. Unless you also enable Prohibit New Task Creation, users can still set task properties while creating new tasks.
The purpose of Hide Advanced Properties Checkbox in Add Scheduled Task Wizard is
to simplify the Scheduled Task Wizard. Users can still set a task s advanced properties by returning to the properties dialog box after the task has been created.
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Part 3: Customizing Windows
Microsoft Windows XP Inside Out, Second Edition If you choose to enable any of these policies, be aware that your settings apply to all users of the current computer, regardless of whether you work within Computer Configuration\ Administrative Templates\Windows Components\Task Scheduler or User Configuration\ Administrative Templates\Windows Components\Task Scheduler. (If you make different changes to both Group Policy nodes, the Computer Configuration changes take priority.) For more information about policies and the Group Policy console, see Appendix F, Group Policy.
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