C/C++-Codebeispiel: Abrufen einer Aufgabenseite

In diesem Beispiel wird die Vorgangsseite eines bekannten Vorgangs abgerufen und angezeigt. Beachten Sie, dass in diesem Beispiel alle Schnittstellen freigegeben werden, wenn sie nicht mehr benötigt werden.

#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 = L"Test Task";
  hr = pITS->Activate(lpcwszTaskName,
                      IID_ITask,
                      (IUnknown**) &pITask);
  
  // Release the 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::QueryInterface to retrieve the IProvideTaskPage 
  // interface, and call IProvideTaskPage::GetPage to retrieve the 
  // task page.
  ///////////////////////////////////////////////////////////////////
  TASKPAGE tpType = TASKPAGE_TASK;
  BOOL fPersistChanges = TRUE;
  HPROPSHEETPAGE phPage; 
  
  IProvideTaskPage *pIProvTaskPage;
  hr = pITask->QueryInterface(IID_IProvideTaskPage,
                              (void **)&pIProvTaskPage);
  // Release the ITask interface.
  pITask->Release();
  
  if (FAILED(hr))
  {
    wprintf(L"Failed calling ITask::QueryInterface: ");
    wprintf(L"error = 0x%x\n",hr);
    CoUninitialize();
    return 1;
  }
  
  hr = pIProvTaskPage->GetPage(tpType,
                               fPersistChanges,
                               &phPage);
  
  // Release the IProvideTaskPage interface.
  pIProvTaskPage->Release();
  
  if (FAILED(hr))
  {
     wprintf(L"Failed calling IProvideTaskPage::GetPage: ");
     wprintf(L"error = 0x%x\n",hr);
     CoUninitialize();
     return 1;
  }
  
  
  //////////////////////////////////////////////////////////////////
  // Display the page using additional code.
  //////////////////////////////////////////////////////////////////
  
  PROPSHEETHEADER psh;
  ZeroMemory(&psh, sizeof(PROPSHEETHEADER));
  psh.dwSize = sizeof(PROPSHEETHEADER);
  psh.dwFlags = PSH_DEFAULT | PSH_NOAPPLYNOW;
  psh.phpage = &phPage;
  psh.nPages = 1;

  int psResult = PropertySheet(&psh);
  if (psResult <= 0)
  {
    wprintf(L"Failed to create the property page: ");
    wprintf(L"0x%x\n", GetLastError());
  }
  
  CoUninitialize();
  return 0;
}

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