普印力打印机
client.DownloadFile(URL, fileName);
FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
BinaryReader r = new BinaryReader(fs);
byte[] mbyte = r.ReadBytes((int)fs.Length);
FileStream fstr = new FileStream(Path, FileMode.OpenOrCreate, FileAccess.Write);
fstr.Write(mbyte, 0, (int)fs.Length);
fstr.Close();