Lua获取文件长度和判断文件是否存在函数分享

获得文件长度

 function length_of_file(filename)

  local fh = assert(io.open(filename, "rb"))

  local len = assert(fh:seek("end"))

  fh:close()

  return len

end

function file_exists(path)

  local file = io.open(path, "rb")

  if file then file:close() end

  return file ~= nil

end