[StructLayoutAttribute(LayoutKind.Sequential)]
    public struct NET_DVR_CHANNEL
    {
        [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = MAX_DOMAIN_NAME, ArraySubType = UnmanagedType.I1)]
        public byte[] byAddress;
        public ushort wDVRPort;
        [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 2, ArraySubType = UnmanagedType.I1)]
        public byte[] byRes1;
        [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = NAME_LEN, ArraySubType = UnmanagedType.I1)]
        public byte[] sUserName;
        [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = PASSWD_LEN, ArraySubType = UnmanagedType.I1)]
        public byte[] sPassword;
        public uint dwChannel;
        [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 32, ArraySubType = UnmanagedType.I1)]
        public byte[] byRes2;
    }

    [StructLayout(LayoutKind.Explicit)]
    public struct NET_DVR_SLAVE_CHANNEL_UNION
    {
        [FieldOffsetAttribute(0)]
        [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 152, ArraySubType = UnmanagedType.I1)]
        public byte[] byRes;
        [FieldOffsetAttribute(0)]
        public uint dwLocalChannel;
        [FieldOffsetAttribute(0)]
        public NET_DVR_CHANNEL struRemoteChannel;
    }
}