如何获取文件夹大小

DWORD64 GetFolderSize(LPCTSTR szPath, DWORD *dwFiles, DWORD *dwFolders)
{
 TCHAR szFileFilter[512];
 TCHAR szFilePath[512];
 HANDLE hFind = NULL;
 WIN32_FIND_DATA fileinfo;
 DWORD64    dwSize = 0;

 lstrcpy(szFilePath,szPath);
 lstrcat(szFilePath,L"//");
 lstrcpy(szFileFilter,szFilePath);
 lstrcat(szFileFilter,L"*.*");

 hFind = FindFirstFile(szFileFilter,&fileinfo);
 do
 {
  if(fileinfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
  {
   if (!lstrcmp(fileinfo.cFileName,L".") || !lstrcmp(fileinfo.cFileName,L".."))
   {
    //Do nothing for "." and ".." folders
   }
   else
   {
    TCHAR sztmp[512];
    lstrcpy(sztmp,szFilePath);
    lstrcat(sztmp,fileinfo.cFileName);
    dwSize += GetFolderSize(sztmp,dwFiles,dwFolders);

    if(dwFolders != NULL)
    {
     ++(*dwFolders);
    }
   }
  }
  else
  {
   if(dwFiles != NULL)
   {
    ++(*dwFiles);
   }
  }

  dwSize += (fileinfo.nFileSizeHigh * (MAXDWORD+1)) + fileinfo.nFileSizeLow;//fileinfo.nFileSizeLow;

 }while(FindNextFile(hFind,&fileinfo));

 FindClose(hFind);
 return dwSize;
}