Shell编程

开发平台：
Visual C++

DropHandler.h：源码内容
							#if !defined(AFX_DROPHANDLER_H__20010326_81A7_8573_71AC_0080AD509054__INCLUDED_)
#define AFX_DROPHANDLER_H__20010326_81A7_8573_71AC_0080AD509054__INCLUDED_
#pragma once
#include "DropTargetImpl.h"
/////////////////////////////////////////////////////////////////////////////
// CDropHandler
// We need a DropHandler Shell Extension to handle drops on the root
// folder (or the ADF file itself) in Windows2000.
//
// A DropHandler Shell extension is a COM object, which supports
// IDropTarget and IPersistFile. We reuse the implmentation
// of the IDropTarget from the internal drag'n'drop stuff.
class ATL_NO_VTABLE CDropHandler :
   public CComObjectRootEx<CComSingleThreadModel>,
   public CComCoClass<CDropHandler, &CLSID_DropHandler>,
   public IPersistFile,
   public IDropTargetImpl
{
public:
DECLARE_PROTECT_FINAL_CONSTRUCT()
BEGIN_COM_MAP(CDropHandler) 
   COM_INTERFACE_ENTRY_IID(IID_IDropTarget,IDropTarget)
   COM_INTERFACE_ENTRY_IID(IID_IPersistFile,IPersistFile)
END_COM_MAP()
// CDropHandler
public:
   static HRESULT WINAPI UpdateRegistry(BOOL bRegister)
   {
      CComBSTR bstrCLSID(CLSID_DropHandler);
      CComBSTR bstrDescription;
      CComBSTR bstrProject;
      bstrDescription.LoadString(IDS_DESCRIPTION);
      bstrProject.LoadString(IDS_PROJNAME);
      _ATL_REGMAP_ENTRY rm[] = { 
         { OLESTR("CLSID"), bstrCLSID },
         { OLESTR("PROJECTNAME"), bstrProject },
         { OLESTR("DESCRIPTION"), bstrDescription },
         { NULL,NULL } };
      return _Module.UpdateRegistryFromResource(IDR_DROPHANDLER, bRegister, rm);
   }
   HRESULT FinalConstruct()
   {
      HRESULT Hr;
      CComObject<CFolder> *pFolder;
      HR( CComObject<CFolder>::CreateInstance(&pFolder) );
      // Initialize the IDropTarget code.
      // The _Init() call will do AddRef() and Release() on the CFolder.
      // The CFolder object will be initialized in the IPersistFile::Load() method
      // called by the Shell later.
      return _Init(pFolder, NULL);
   }
   // IPersist
   STDMETHOD(GetClassID)(CLSID *pCLSID)
   {
      VALIDATE_POINTER(pCLSID);
      *pCLSID = CLSID_DropHandler;
      return S_OK;
   }
   // IPersistFile
   STDMETHOD(IsDirty)(void)
   {
      ATLTRACENOTIMPL(_T("CDropHandler::IsDirty"));
   }
   
   STDMETHOD(Load)(LPCOLESTR pwstrFileName, DWORD /*dwMode*/)
   {
      ATLASSERT(m_pFolder);
      CPidl pidl;
      pidl.Attach( ShellGetFileNamePidl(const_cast<LPOLESTR>(pwstrFileName)) );
      return m_pFolder->Initialize(pidl);
   }
   STDMETHOD(Save)(LPCOLESTR, BOOL)
   {
      ATLTRACENOTIMPL(_T("CDropHandler::Save"));
   }
   
   STDMETHOD(SaveCompleted)(LPCOLESTR)
   {
      ATLTRACENOTIMPL(_T("CDropHandler::SaveCompleted"));
   }
   
   STDMETHOD(GetCurFile)(LPOLESTR *)
   {
      ATLTRACENOTIMPL(_T("CDropHandler::GetCurFile"));
   }
   
};
#endif // !defined(AFX_DROPHANDLER_H__20010326_81A7_8573_71AC_0080AD509054__INCLUDED_)

						