何获得"C:\\WINDOWS\\Web\\Wallpaper\\"的IShellFolder接口指针?

[zlhuuo5]

如何获得"C:\\WINDOWS\\Web\\Wallpaper\\"的IShellFolder接口指针?

[MoXiaoRab]

#include   <shlobj.h>   
    
  void   EnumerateFolder(LPCTSTR   path)   
  {   
        HRESULT   hr;   //   COM   result,   you'd   better   examine   it   in   your   code!   
        hr   =   CoInitialize(NULL);   //   initialize   COM   
        //   NOTE:   usually   COM   would   be   initialized   just   once   in   your   main()   
    
        LPMALLOC   pMalloc   =   NULL;   //   memory   manager,   for   freeing   up   PIDLs   
        hr   =   SHGetMalloc(&pMalloc);   
    
        LPSHELLFOLDER   psfDesktop   =   NULL;   //   namespace   root   for   parsing   the   path   
        hr   =   SHGetDesktopFolder(&psfDesktop);   
    
        //   IShellFolder::ParseDisplayName   requires   the   path   name   in   Unicode.   
        OLECHAR   olePath[MAX_PATH];   //   wide-char   version   of   path   name   
        MultiByteToWideChar(CP_ACP,   MB_PRECOMPOSED,   path,   -1,   olePath,   MAX_PATH);   
    
        //   parse   path   for   absolute   PIDL,   and   connect   to   target   folder   
        LPITEMIDLIST   pidl   =   NULL;   //   general   purpose   
        hr   =   psfDesktop->ParseDisplayName(NULL,   NULL,   olePath,   NULL,   &pidl,   NULL);   
        LPSHELLFOLDER   psfFolder   =   NULL;   
        hr   =   psfDesktop->BindToObject(pidl,   NULL,   IID_IShellFolder,     
                                                                    (void**)&psfFolder);   
        psfDesktop->Release();   //   no   longer   required   
        pMalloc->Free(pidl);   
    
        LPENUMIDLIST   penumIDL   =   NULL;   //   IEnumIDList   interface   for   reading   contents   
        hr   =   psfFolder->EnumObjects(NULL,   SHCONTF_FOLDERS   |   SHCONTF_NONFOLDERS,     
                                                                &penumIDL);   
        while(1)   {   
              //   retrieve   a   copy   of   next   local   item   ID   list   
              hr   =   penumIDL->Next(1,   &pidl,   NULL);   
              if(hr   ==   NOERROR)   {   
                    WIN32_FIND_DATA   ffd;   //   let's   cheat   a   bit   :)   
                    hr   =   SHGetDataFromIDList(psfFolder,   pidl,   SHGDFIL_FINDDATA,   &ffd,     
                                                                      sizeof(WIN32_FIND_DATA));   
    
                    cout   <<   "Name   =   "   <<   ffd.cFileName   <<   endl;   
                    cout   <<   "Type   =   "   <<   (   (ffd.dwFileAttributes   &   FILE_ATTRIBUTE_DIRECTORY)   
                                                                  ?   "dir\n"   :   "file\n"   );   
                    cout   <<   "Size   =   "   <<   ffd.nFileSizeLow   <<   endl;   
                      
                    pMalloc->Free(pidl);   
              }   
              //   the   expected   "error"   is   S_FALSE,   when   the   list   is   finished   
              else   break;   
        }   
    
        //   release   all   remaining   interface   pointers   
        penumIDL->Release();   
        psfFolder->Release();   
        pMalloc->Release();   
    
        CoUninitialize();   //   shut   down   COM   
  }