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C/C++ Code Example: Retrieving Task Exit Code

  • Artikkeli

This example retrieves the last exit code returned by a known task. (A returned value of "0" indicates the task was never run.) 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"TestTask";
  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::GetExitCode. Note that this method is 
  // inherited from IScheduledWorkItem.
  ///////////////////////////////////////////////////////////////////
  DWORD pdwExitCode;
  
  hr = pITask->GetExitCode(&pdwExitCode);
  
  // Release ITask interface.
  pITask->Release();
  
  if (FAILED(hr))
  {
    wprintf(L"Failed calling ITask::GetExitCode: ");
    wprintf(L"error = 0x%x\n",hr);
    CoUninitialize();
    return 1;
  }
  
  
  wprintf(L"The last exit code of Test Task is: %d\n", pdwExitCode);
  
  
  CoUninitialize();
  return 0;
}

Task Scheduler 1.0 Examples