获取文件或是文件夹的大小和占用空间

//Get size of a whole dir
//return bytes
DWORD64 GetFolderSize(LPCTSTR szPath, DWORD *dwFiles, DWORD *dwFolders)
{
 TCHAR szFileFilter[512];
 TCHAR szFilePath[512];
 HANDLE hFind = NULL;
 WIN32_FIND_DATA fileinfo;
 DWORD64    dwSize = 0;
 
 strcpy(szFilePath,szPath);
 strcat(szFilePath,"");
 strcpy(szFileFilter,szFilePath);
 strcat(szFileFilter,"*.*");
 
 hFind = FindFirstFile(szFileFilter,&fileinfo);
 do
 {
  if(fileinfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
  {
   if (!strcmp(fileinfo.cFileName,".") || !strcmp(fileinfo.cFileName,".."))
   {
    //Do nothing for "." and ".." folders
   }
   else
   {
    TCHAR sztmp[512];
    strcpy(sztmp,szFilePath);
    strcat(sztmp,fileinfo.cFileName);
    dwSize = dwSize + GetFolderSize(sztmp);
    if(dwFolders != NULL)
    {
     ++(*dwFolders);
    }
   }
  }
  else
  {
   if(dwFiles != NULL)
   {
    ++(*dwFiles);
   }
  }
 
  dwSize += fileinfo.nFileSizeLow;
 
 }while(FindNextFile(hFind,&fileinfo));
 
 FindClose(hFind);
 return dwSize;
}