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   USB_PIPE_INFO  PipeList[0];

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// To get the USB_PIPE_INFO data

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   size = Marshal.SizeOf(typeof(USB_NODE_CONNECTION_INFORMATION_EX)) + 32 * Marshal.SizeOf(typeof(USB_PIPE_INFO)); // Assuming 32 should be enough, you can make this larger

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       int num = (bytes_returned - Marshal.SizeOf(typeof(USB_NODE_CONNECTION_INFORMATION_EX))) / Marshal.SizeOf(typeof(USB_PIPE_INFO));

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       USB_PIPE_INFO[] pipe_info = new USB_PIPE_INFO[num];

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     // Set ptr to an USB_PIPE_INFO element and marshal it back

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                       + j * Marshal.SizeOf(typeof(USB_PIPE_INFO)));

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     pipe_info[j] = (USB_PIPE_INFO)Marshal.PtrToStructure(ptr_pipeinfo, typeof(USB_PIPE_INFO));

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        PIPE_ACCESS_DUPLEX = 0x00000003,

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        PIPE_ACCESS_INBOUND = 0x00000001,

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        PIPE_ACCESS_OUTBOUND = 0x00000002,

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        FILE_FLAG_FIRST_PIPE_INSTANCE = 0x00080000,

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        PIPE_TYPE_BYTE = 0x00000000,

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        PIPE_TYPE_MESSAGE = 0x00000004,

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        PIPE_READMODE_BYTE = 0x00000000,

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        PIPE_READMODE_MESSAGE = 0x00000002,

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        PIPE_WAIT = 0x00000000,

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        PIPE_NOWAIT = 0x00000001,

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        PIPE_ACCEPT_REMOTE_CLIENTS = 0x00000000,

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        PIPE_REJECT_REMOTE_CLIENTS = 0x00000008

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    private const uint PIPE_ACCESS_OUTBOUND = 0x00000002;

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    private const uint PIPE_ACCESS_DUPLEX = 0x00000003;

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    private const uint PIPE_ACCESS_INBOUND = 0x00000001;

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    private const uint PIPE_WAIT = 0x00000000;

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    private const uint PIPE_NOWAIT = 0x00000001;

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    private const uint PIPE_READMODE_BYTE = 0x00000000;

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    private const uint PIPE_READMODE_MESSAGE = 0x00000002;

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    private const uint PIPE_TYPE_BYTE = 0x00000000;

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    private const uint PIPE_TYPE_MESSAGE = 0x00000004;

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    private const uint PIPE_CLIENT_END = 0x00000000;

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    private const uint PIPE_SERVER_END = 0x00000001;

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    private const uint PIPE_UNLIMITED_INSTANCES = 255;

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    private const ulong ERROR_PIPE_CONNECTED = 535;

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        InboundOnly = (int)PIPE_ACCESS_INBOUND,

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        OutboundOnly = (int)PIPE_ACCESS_OUTBOUND,

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        Bidirectional = (int)(PIPE_ACCESS_INBOUND+PIPE_ACCESS_OUTBOUND)

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            PIPE_TYPE_BYTE | PIPE_WAIT,

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            PIPE_UNLIMITED_INSTANCES,

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        if (lastErr == ERROR_PIPE_CONNECTED)

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            if ((uint)Marshal.GetLastWin32Error() == ERROR_PIPE_CONNECTED)

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  public const int FILE_CREATE_PIPE_INSTANCE  = 0x0004;     // named pipe

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const int PIPE_ACCESS_INBOUND = 0x00000001

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const int PIPE_ACCESS_OUTBOUND = 0x00000002

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const int PIPE_ACCESS_DUPLEX = 0x00000003

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const int PIPE_CLIENT_END = 0x00000000

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const int PIPE_SERVER_END = 0x00000001

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const int PIPE_WAIT = 0x00000000

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const int PIPE_NOWAIT = 0x00000001

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const int PIPE_READMODE_BYTE = 0x00000000

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const int PIPE_READMODE_MESSAGE= 0x00000002

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const int PIPE_TYPE_BYTE = 0x00000000

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const int PIPE_TYPE_MESSAGE = 0x00000004

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const int PIPE_UNLIMITED_INSTANCES = 255

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const int PIPE_ACCESS_INBOUND = 0x00000001

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const int PIPE_ACCESS_OUTBOUND = 0x00000002

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const int PIPE_ACCESS_DUPLEX = 0x00000003

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const int PIPE_CLIENT_END = 0x00000000

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const int PIPE_SERVER_END = 0x00000001

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const int PIPE_WAIT = 0x00000000

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const int PIPE_NOWAIT = 0x00000001

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const int PIPE_READMODE_BYTE = 0x00000000

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const int PIPE_READMODE_MESSAGE= 0x00000002

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const int PIPE_TYPE_BYTE = 0x00000000

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const int PIPE_TYPE_MESSAGE = 0x00000004

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const int PIPE_UNLIMITED_INSTANCES = 255

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private const uint FILE_FLAG_FIRST_PIPE_INSTANCE = 0x00080000;

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        public const int ERROR_PIPE_BUSY = 231;

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        public const int ERROR_PIPE_NOT_CONNECTED = 233;

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        public const int ERROR_PIPE_CONNECTED = 535;

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        public const int ERROR_PIPE_LISTENING = 536;

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        public const int RPC_X_INVALID_PIPE_OBJECT = 1830;

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        public const int RPC_X_WRONG_PIPE_ORDER = 1831;

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        public const int RPC_X_WRONG_PIPE_VERSION = 1832;

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        public const int RPC_X_PIPE_CLOSED = 1916;

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        public const int RPC_X_PIPE_DISCIPLINE_ERROR = 1917;

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        public const int RPC_X_PIPE_EMPTY = 1918;