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C/C++ Code Example: Retrieving the Task MaxRunTime

  • Artikkeli

This example retrieves the maximum amount of time the task can run (in milliseconds) and displays that number 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;\n");
     wprintf(L"error = 0x%x\n",hr);
     CoUninitialize();
     return 1;
  }
  
  
  ///////////////////////////////////////////////////////////////////
  // Call ITask::GetMaxRunTime to display the maximum time Test Task
  // is allowed to run.
  ///////////////////////////////////////////////////////////////////
  
  DWORD pdwRunTime;
  hr = pITask->GetMaxRunTime(&pdwRunTime);
  pITask->Release();
  if (FAILED(hr))
  {
     wprintf(L"Failed calling ITask::GetMaxRunTime: \n");
     wprintf(L"error = 0x%x\n",hr);
     CoUninitialize();
     return 1;
  }
  
  wprintf(L"Test Task can run for %d milliseconds\n", pdwRunTime);
  CoUninitialize();
  return 0;
}

Task Scheduler 1.0 Examples