[代码]Delphi实现获取文件及文件夹大小(支持超过2G的大文件)

注意函数返回值类型是Int64，如果文件存在则返回文件大小，否则返回0。

function FileSize(FileName: string): Int64;

var

  sr: TSearchRec;

begin

  if FindFirst(FileName, faAnyFile, sr) = 0 then

    Result := Int64(sr.FindData.nFileSizeHigh) shl 32 + Int64(sr.FindData.nFileSizeLow)

  else

    Result := 0;



  FindClose(sr);

end;

由此可以得到获取文件夹大小的函数如下：

function FolderSize(FolderName: string): Int64;

var

  sr: TSearchRec;

begin

  Result := 0;



  if RightStr(FolderName, 1) <> '\' then FolderName := FolderName + '\';



  if FindFirst(FolderName + '*.* ', faAnyFile, sr) = 0 then

    repeat

      if (sr.Name <> '.') and (sr.Name <> '..') then begin

        Result := Result + FileSize(FolderName + sr.Name);



        if (sr.Attr and faDirectory) <> 0 then

          Result := Result + FolderSize(FolderName + sr.Name + '\');

      end;

    until FindNext(sr) <> 0;



  FindClose(sr);

end;

参考：

1. File Size - Get the Size of a File in Bytes using Delphi
   http://delphi.about.com/od/delphitips2008/qt/filesize.htm

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