ScheduleTasks method

Defines a set of tasks to execute.


HRESULT retVal = object.ScheduleTasks(TaskInfo, Events, TaskIDs, ulNumTasks, ulWaitPeriod);


  • TaskInfo [in]

    Array of one or more DXTMTASKINFO structures that define the task to perform.

  • Events [in]
    Type: HANDLE

    Optional array of event-object handles associated with each scheduled task.

  • TaskIDs [out]
    Type: DWORD

    Optional array used to receive the ID of each scheduled task.

  • ulNumTasks [in]
    Type: unsigned long

    Number of tasks to schedule. This also defines the size of the arrays associated with the Events and TaskIDs parameters.

  • ulWaitPeriod [in]
    Type: unsigned long

    Number of milliseconds to wait for each scheduled task to complete.


This method adds a set of tasks to a queue for asynchronous execution. All tasks are queued using the calling thread. If the calling thread must wait and has finished queuing the tasks, it will start to execute tasks in the queue until the queue is empty. This reduces the amount of necessary context switches.

As each task is scheduled, the associated event, as specified by the Events parameter, is reset. As each task completes, the associated event is signaled.

If a nonzero value is supplied for the ulWaitPeriod parameter, the Events array is required and must have a valid event-object handle in each entry. A value of INFINITE can be used.

Each assigned task can use an asynchronous procedure call (APC) or an event, but specifying both in the DXTMTASKINFO structure results in the function returning E_INVALIDARG once it attempts to execute that task.

See also