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C/C++ Code Example: Retrieving Task Account Information

  • Cikk

This code example retrieves the account information of a known task and displays the account name on the screen. This example assumes that the task and the test task already exist on the local computer and that the Task Scheduler is running.

#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::GetAccountInformation. Note that this method is 
  // inherited from IScheduledWorkItem.
  ///////////////////////////////////////////////////////////////////
  LPWSTR pwszAccountName;
  
  hr = pITask->GetAccountInformation(&pwszAccountName);
  
  // Release the ITask interface.
  pITask->Release();

  if(hr == SCHED_E_NO_SECURITY_SERVICES)
  {
    wprintf(L"Error: SCHED_E_NO_SECURITY_SERVICES");
    wprintf(L"Security services are available only on Windows Server 2003");
    wprintf(L", Windows XP, and Windows 2000.");
    CoUninitialize();
    return 1;

  }
  
  if (FAILED(hr))
  {
    wprintf(L"Failed calling ITask::GetAccountInformation: ");
    wprintf(L"error = 0x%x\n",hr);
    CoUninitialize();
    return 1;
  }
  
  
  wprintf(L"The account name for Test Task is: ");
  wprintf(L"  %s\n",pwszAccountName);
  
  CoTaskMemFree(pwszAccountName);
  CoUninitialize();
  return 0;
}

Task Scheduler 1.0 Examples