![]() A bound Trigger object can’t be used after its task is closed.To put the same Trigger in a second TriggerList, use Clone() to create an unbound copy. Therefore a bound Trigger can’t be added or assigned to a TriggerList because it is already in one. A Trigger can only be in one TriggerList at a time.The distinction between unbound and bound Triggers rarely comes up in client code, but the following points are the essence: The COM interface is released when the corresponding Task is closed, so no special care is required on the part of the client. When a Trigger is added to a TriggerList, it is then said to be bound and it remains so unless it is removed from that collection. An unbound Trigger does not hold any COM resources and has no special usage protocol. When a new Trigger is created, it is not associated with any Task or TriggerList and is said to be unbound. ScheduledTasks st = new ScheduledTasks() Trigger tg = new DailyTrigger( 16, 30) // hour and minute Add a trigger to run task "foo" at 4:30 pm every day All tasks in the folder are said to be "scheduled," regardless of whether they will actually ever run. In the machine's Scheduled Tasks folder, Windows keeps information for each scheduled task in a file with a *.job extension. This may be either the local machine or a named machine on the network to which the caller has administrative privileges. ScheduledTasksĪ ScheduledTasks object represents the Scheduled Tasks folder on a particular computer. For most purposes, clients can more simply consider the various concrete trigger classes as direct subclasses of Trigger. The abstract class StartableTrigger makes the hierarchy a bit more complicated than I'd like, but is included for completeness. The complete class hierarchy is illustrated by the following diagram, drawn to the standard David Hall set in his article. Contents Classes Sample Code Changes from Version 1 Compatibility with Version 1 Changes in Internals History Classes This article introduces the library's class hierarchy and also describes some of the changes that were made from the original version. It can easily be modified to insert whatever tests you may want to make. The test application is a trivial command line interpreter that operates on scheduled tasks. The second download contains the source code for the library and for a C# test application that also serves as sample code. It is worth consulting when the library's documentation lacks. MSDN documents the COM interface on which the library is based. The documentation is intended to be self-contained and sufficient for any client to use the library. A later section on compatibility gives more detail.ĭocumentation is contained in an HTML help file, MSDN-style, which is downloaded along with the library. It is deprecated, however, because of the leaks. Fixing the memory leak problem required the adoption of an incompatible class hierarchy, but, for clients in transition, the original hierarchy remains available as a kind of differently organized view of the same objects. This new version offers many improvements, including the elimination of COM memory leaks. In the original work, David demonstrated how a collection of COM interfaces could be tamed into a logical class library in the. The library is an expanded version of a package written by member David Hall. ![]() This library is a wrapper for the Task Scheduler 1.0 interface, which is still available in Vista and is compatible with Windows XP, Windows Server 2003 and Windows 2000. Note: Since this library was created, Microsoft has introduced a new task scheduler (Task Scheduler 2.0) for Windows Vista. NET framework does not offer any wrapper for it. Programmers have a well-documented COM interface, but the. From the command line, the schtasks command and the old at command do the same. ![]() Windows Explorer presents a user interface to the service when you browse the %WINDIR%\TASKS folder, typically from the shortcut in the control panel. Task Scheduler is the Windows service that schedules and automatically starts programs.
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