hidlib/Win32Usb.cs

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using System;
using System.Text;
using System.Runtime.InteropServices;

namespace UsbLibrary
{
	/// <summary>
	/// Class that wraps USB API calls and structures.
	/// </summary>
    public class Win32Usb
    {
        #region Structures
        /// <summary>
        /// An overlapped structure used for overlapped IO operations. The structure is
        /// only used by the OS to keep state on pending operations. You don't need to fill anything in if you
        /// unless you want a Windows event to fire when the operation is complete.
        /// </summary>
        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        protected struct Overlapped
        {
            public uint Internal;
            public uint InternalHigh;
            public uint Offset;
            public uint OffsetHigh;
            public IntPtr Event;
        }
		/// <summary>
		/// Provides details about a single USB device
		/// </summary>
        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        protected struct DeviceInterfaceData
        {
            public int Size;
            public Guid InterfaceClassGuid;
            public int Flags;
            public IntPtr Reserved;
        }
		/// <summary>
		/// Provides the capabilities of a HID device
		/// </summary>
        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        protected struct HidCaps
        {
            public short Usage;
            public short UsagePage;
            public short InputReportByteLength;
            public short OutputReportByteLength;
            public short FeatureReportByteLength;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)]
            public short[] Reserved;
            public short NumberLinkCollectionNodes;
            public short NumberInputButtonCaps;
            public short NumberInputValueCaps;
            public short NumberInputDataIndices;
            public short NumberOutputButtonCaps;
            public short NumberOutputValueCaps;
            public short NumberOutputDataIndices;
            public short NumberFeatureButtonCaps;
            public short NumberFeatureValueCaps;
            public short NumberFeatureDataIndices;