void SendMessage(TransferOP opCode, string msg)
{
var data = Encoding.UTF8.GetBytes(msg);
SendData(opCode, data, 0, data.Length);
}
void SendData(TransferOP opCode, byte[] data, int offset, int length)
{
byte[] senddata = new byte[length + 4];//要发出的数据：组成为命令，数据长度，数据
senddata[0] = (byte)((int)opCode / 256);
senddata[1] = (byte)((int)opCode % 256);
senddata[2] = (byte)(length / 256);
senddata[3] = (byte)(length % 256);
Buffer.BlockCopy(data, offset, senddata, 4, length);
Client.Send(senddata, 0, senddata.Length);
}
