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C/C++ Code Example: Retrieving Task Priority

  • Artikkeli

This example retrieves the priority level of a task and displays the path to the working directory 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);
  
  pITS->Release();
  if (FAILED(hr))
  {
     wprintf(L"Failed calling ITaskScheduler::Activate: error = 0x%x\n",hr);
     CoUninitialize();
     return 1;
  }
  
  
  ///////////////////////////////////////////////////////////////////
  // Call ITask::GetPriority to retrieve the priority level 
  // of Test Task.
  ///////////////////////////////////////////////////////////////////
  
  DWORD pdwPriority;
  hr = pITask->GetPriority(&pdwPriority);
  pITask->Release();
  if (FAILED(hr))
  {
     wprintf(L"Failed calling ITask::GetPriority: error = 0x%x\n",hr);
     CoUninitialize();
     return 1;
  }
  if(pdwPriority == HIGH_PRIORITY_CLASS)
  {
     wprintf(L"Test Task is a high priority task.\n");
  }
  else
  {
     wprintf(L"Test Task is not a high priority task.\n");
  }
  
  CoUninitialize();
  return 0;
  
}

Task Scheduler 1.0 Examples