public byte[] GetNormalBuff()
{
write.Flush();
byte[] v1 = new byte[2];
byte[] ret = stream.GetBuffer();
v1[0] = ret[0]; v1[1] = ret[1];
ushort nLen = BitConverter.ToUInt16(v1, 0);
byte[] retdata = new byte[nLen];
Buffer.BlockCopy(ret, 0, retdata, 0, nLen);
return retdata;
}