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Trigger Types

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The time-based and event-based triggers that are described below allow you to start tasks in a variety of ways.

Task Scheduler 2.0 Triggers

The following trigger types are defined by the TASK_TRIGGER_TYPE2 enumeration.

Trigger Description
Event trigger (event based trigger) For scripting development, see EventTrigger.
For C++ development, see IEventTrigger.
For XML development, see EventTrigger Element.
 Starts the task when a specific system event occurs.
Time trigger (time-based trigger)For scripting development, see TimeTrigger.
For C++ development, see ITimeTrigger.
For XML development, see TimeTrigger Element.
 Starts the task at a specific date and time.
Daily trigger (time-based calendar trigger)For scripting development, see DailyTrigger.
For C++ development, see IDailyTrigger.
For XML development, see CalendarTrigger Element.
 Starts the task at a specific time on a daily schedule. For example, the task starts at 8:00 AM every day or every other day.
Weekly trigger (time-based calendar trigger)For scripting development, see WeeklyTrigger.
For C++ development, see IWeeklyTrigger.
For XML development, see CalendarTrigger Element.
 Starts the task at a specific time on a weekly schedule. For example, the task starts at 8:00 AM on a specific day of the week every week or on a specific day of the week every other week.
Monthly trigger (time-based calendar trigger)For scripting development, see MonthlyTrigger.
For C++ development, see IMonthlyTrigger.
For XML development, see CalendarTrigger Element.
 Starts the task at a specific time on a monthly schedule. For example, the task starts at 8:00 AM on specific days of the month on specific months.
Monthly day-of-week (DOW) trigger (time-based calendar trigger)For scripting development, see MonthlyDOWTrigger.
For C++ development, see IMonthlyDOWTrigger.
For XML development, see CalendarTrigger Element.
 Starts the task at a specific time on a monthly day-of-week schedule. For example, the task starts at 8:00 AM on specific days of the week, weeks of the month, and months of the year.
Idle trigger (event-based trigger)For scripting development, see IdleTrigger.
For C++ development, see IIdleTrigger.
For XML development, see IdleTrigger Element.
 Starts the task when the computer enters an idle state.
Registration trigger (event-based trigger)For scripting development, see RegistrationTrigger.
For C++ development, see IRegistrationTrigger.
For XML development, see RegistrationTrigger Element.
 Starts the task when the task is registered or updated.
Boot trigger (event-based trigger)For scripting development, see BootTrigger.
For C++ development, see IBootTrigger.
For XML development, see BootTrigger Element.
 Starts the task when the system is booted.
Logon trigger (event-based trigger)For scripting development, see LogonTrigger.
For C++ development, see ILogonTrigger.
For XML development, see LogonTrigger Element.
 Starts the task when a user logs on.
Session state change trigger (event-based trigger)For scripting development, see SessionStateChangeTrigger.
For C++ development, see ISessionStateChangeTrigger.
For XML development, see SessionStateChangeTrigger Element.
 Starts the task when a Terminal Server session changes state.

Task Scheduler 1.0 Triggers

The following trigger types are defined by the TASK_TRIGGER_TYPE enumeration. To implement any of the following triggers, see the TASK_TRIGGER structure.

  • Once trigger: Starts the task a single time.
  • Daily trigger: Starts the task on a daily interval.
  • Weekly trigger: Starts the task on a weekly schedule.
  • Monthly trigger: Starts the task on a monthly schedule.
  • Monthly DOW trigger: Starts the task on a monthly day-of-week schedule.
  • On Idle trigger: Starts the task when the computer is in an idle state.
  • System Start trigger: Starts the task when the computer is booted.
  • Logon trigger: Starts the task when a specific user logs on.

Task Triggers

Trigger Interfaces

Trigger Structures