STDMETHOD(ButtonClicked) and MAPI

hi Outlook add-in using VC++ ATL/COM[^]
i had use this article and try to create Folder with Buttonclicked method.
But Outlook crash when i try ti initialize _ApplicationPtr pApp

_ApplicationPtr pApp;
		_NameSpacePtr pNamespace;
		 MAPIFolderPtr pFolder;
		_ItemsPtr pItems;
		_ContactItemPtr pNewContact;
		pApp->GetNamespace(L"MAPI",&pNamespace);
		pNamespace->GetDefaultFolder(olFolderContacts,&pFolder);
		pApp->CreateItem(olContactItem,(IDispatch**)&pNewContact);
		pNewContact->put_LastName(OLESTR("Test"));
		pNewContact->put_FirstName(OLESTR("test"));
		pNewContact->Save();

i am just lern com outlook(
tnx

Tags: C++, Outlook, AddIn