public void Connect(IPAddress ip, int port, string username, string password)
{
if (_socket != null)
{
throw new InvalidOperationException("Already connected");
}
var ipe = new IPEndPoint(ip, port);
_socket = new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
_socket.Connect(ipe);
// read header
var header = new byte[0x40];
var read = _socket.Receive(header);
Debug.Assert(read == header.Length);
Debug.Assert(header[0] == (byte)'h');
Debug.Assert(header[1] == (byte)'e');
Debug.Assert(header[2] == (byte)'a');
Debug.Assert(header[3] == (byte)'d');
// send login
var loginPacket = new DvrLoginPacket();
loginPacket.UserName = username;
loginPacket.Password = password;
loginPacket.MachineName = Environment.MachineName.ToLower();
loginPacket.Send(_socket);
var receive = true;
while (receive)
{
var packet = ReadPacket();
switch (packet?.PacketType)
{
case DvrPacketType.CameraInfo:
CameraInfo = (DvrCameraInfoPacket)packet;
receive = false;
break;
case DvrPacketType.DeviceInformation:
DeviceInformation = (DvrDeviceInformationPacket)packet;
break;
default:
Console.WriteLine($"Unsupported packet type: {packet?.PacketType}");
break;
}
}
}
private DvrPacket ReadPacket()
{
if (_currentPos >= _lastRead - 8)
{
ReadMoreData();
}
var packetStart = _currentPos;
Debug.Assert(_buffer[_currentPos++] == 0x31); // '1'
Debug.Assert(_buffer[_currentPos++] == 0x31); // '1'
Debug.Assert(_buffer[_currentPos++] == 0x31); // '1'
Debug.Assert(_buffer[_currentPos++] == 0x31); // '1'
var packetLength = BitConverter.ToInt32(_buffer, _currentPos);
_currentPos += 4;
if (packetLength == 0)
{
return(null);
}
var packetType = (DvrPacketType)BitConverter.ToInt32(_buffer, _currentPos);
_currentPos += packetLength;
switch (packetType)
{
case DvrPacketType.CameraInfo:
return(DvrCameraInfoPacket.FromData(_buffer, packetStart));
case DvrPacketType.DeviceInformation:
return(DvrDeviceInformationPacket.FromData(_buffer, packetStart));
default:
return(new DvrUnsupportedPacket(packetType));
}
}