using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Threading;
using System.Collections;
using System.IO;

        //以下是调用windows的API的函数
        //获得GUID
        [DllImport("hid.dll")]
        public static extern void HidD_GetHidGuid(ref Guid HidGuid);
        Guid guidHID = Guid.Empty;
        //过滤设备，获取需要的设备
        [DllImport("setupapi.dll", SetLastError = true)]
        public static extern IntPtr SetupDiGetClassDevs(ref Guid ClassGuid, uint Enumerator, IntPtr HwndParent, DIGCF Flags);
        IntPtr hDevInfo;
        //获取设备，true获取到
        [DllImport("setupapi.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern Boolean SetupDiEnumDeviceInterfaces(IntPtr hDevInfo, IntPtr devInfo, ref Guid interfaceClassGuid, UInt32 memberIndex, ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData);
        public struct SP_DEVICE_INTERFACE_DATA
        {
            public int cbSize ;
            public Guid interfaceClassGuid;
            public int flags;
            public int reserved;
        }
        // 获取接口的详细信息 必须调用两次 第1次返回长度 第2次获取数据
        [DllImport("setupapi.dll", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern bool SetupDiGetDeviceInterfaceDetail(IntPtr deviceInfoSet, ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData, IntPtr deviceInterfaceDetailData,
            int deviceInterfaceDetailDataSize, ref int requiredSize, SP_DEVINFO_DATA deviceInfoData);
        [StructLayout(LayoutKind.Sequential)]
        public class SP_DEVINFO_DATA
        {
            public int cbSize = Marshal.SizeOf(typeof(SP_DEVINFO_DATA));
            public Guid classGuid = Guid.Empty; // temp
            public int devInst = 0; // dumy
            public int reserved = 0;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 2)]
        internal struct SP_DEVICE_INTERFACE_DETAIL_DATA
        {
            internal int cbSize;
            internal short devicePath;
        }

        public enum DIGCF
        {
            DIGCF_DEFAULT = 0x1,
            DIGCF_PRESENT = 0x2,
            DIGCF_ALLCLASSES = 0x4,
            DIGCF_PROFILE = 0x8,
            DIGCF_DEVICEINTERFACE = 0x10
        }

        //获取设备文件
        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern int CreateFile(
            string lpFileName,                            // file name
            uint dwDesiredAccess,                        // access mode
            uint dwShareMode,                            // share mode
            uint lpSecurityAttributes,                    // SD
            uint dwCreationDisposition,                    // how to create
            uint dwFlagsAndAttributes,                    // file attributes
            uint hTemplateFile                            // handle to template file
            );
        //读取设备文件
        [DllImport("Kernel32.dll",SetLastError = true)]
        private static extern bool ReadFile
            (
                IntPtr hFile,
                byte[] lpBuffer,
                uint nNumberOfBytesToRead,
                ref uint lpNumberOfBytesRead,
                IntPtr lpOverlapped
            );

        //释放设备
        [DllImport("hid.dll")]
        static public extern bool HidD_FreePreparsedData(ref IntPtr PreparsedData);
        //关闭访问设备句柄，结束进程的时候把这个加上保险点
        [DllImport("kernel32.dll")]
        static public extern int CloseHandle(int hObject);