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C/C++ Code Example: Retrieving Task Status

  • Artikel

This example retrieves the current status of the task and displays it on the screen. This example assumes that the task and the test task already exist on the local computer.

#include <windows.h>
#include <initguid.h>
#include <ole2.h>
#include <mstask.h>
#include <msterr.h>
#include <wchar.h>

int main(int argc, char **argv)
{
  HRESULT hr = S_OK;
  
  
  ///////////////////////////////////////////////////////////////////
  // Call CoInitialize to initialize the COM library and then
  // call CoCreateInstance to get the Task Scheduler object.
  ///////////////////////////////////////////////////////////////////
  ITaskScheduler *pITS;
  hr = CoInitialize(NULL);
  if (SUCCEEDED(hr))
  {
    hr = CoCreateInstance(CLSID_CTaskScheduler,
                          NULL,
                          CLSCTX_INPROC_SERVER,
                          IID_ITaskScheduler,
                          (void **) &pITS);
    if (FAILED(hr))
    {
      CoUninitialize();
      return 1;
    }
  }
  else
  {
     return 1;
  }
  
  
  ///////////////////////////////////////////////////////////////////
  // Call ITaskScheduler::Activate to get the Task object.
  ///////////////////////////////////////////////////////////////////
  ITask *pITask;
  LPCWSTR lpcwszTaskName;
  lpcwszTaskName = L"Test Task";
  hr = pITS->Activate(lpcwszTaskName,
                      IID_ITask,
                      (IUnknown**) &pITask);
  
  // Release ITaskScheduler interface.
  pITS->Release();
  
  if (FAILED(hr))
  {
    wprintf(L"Failed calling ITaskScheduler::Activate: ");
    wprintf(L"error = 0x%x\n",hr);
    CoUninitialize();
    return 1;
  }
  
  
  ///////////////////////////////////////////////////////////////////
  // Call ITask::GetStatus. Note that this method is 
  // inherited from IScheduledWorkItem.
  ///////////////////////////////////////////////////////////////////
  HRESULT phrStatus;
  
  hr = pITask->GetStatus(&phrStatus);
  
  // Release the ITask interface.
  pITask->Release();
  
  if (FAILED(hr))
  {
    wprintf(L"Failed calling ITask::GetStatus: ");
    wprintf(L"error = 0x%x\n",hr);
    CoUninitialize();
    return 1;
  }
  
  
  wprintf(L"The status of Test Task is: ");
  
  switch(phrStatus)
  {
  case SCHED_S_TASK_READY:
       wprintf(L"  SCHED_S_TASK_READY\n");
       break;
  case SCHED_S_TASK_RUNNING:
       wprintf(L"  SCHED_S_TASK_RUNNING\n");
       break;
  case SCHED_S_TASK_DISABLED:
       wprintf(L"  SCHED_S_TASK_DISABLED\n");
       break;
  case SCHED_S_TASK_HAS_NOT_RUN:
       wprintf(L"  SCHED_S_TASK_HAS_NOT_RUN\n");
       break;
  case SCHED_S_TASK_NOT_SCHEDULED:
       wprintf(L"  SCHED_S_TASK_NOT_SCHEDULED\n");
       break;
  case SCHED_S_TASK_NO_MORE_RUNS:
       wprintf(L"  SCHED_S_TASK_NO_MORE_RUNS\n");
       break;
  case SCHED_S_TASK_NO_VALID_TRIGGERS:
       wprintf(L"  SCHED_S_TASK_NO_VALID_TRIGGERS\n");
       break;
  default:
       wprintf(L"  unknown status flag!\n"); 
  }
  
  
  CoUninitialize();
  return 0;
}

Task Scheduler 1.0 Examples