获取 usb 信息 尝试

//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);//接下来是访问设备的代码//代码暂时没有整理，传入参数是设备序号,//有些USB设备其实有很多HID设备，就是一个接口上有几个设备，这个时候需要//用index++来逐个循环，直到获取设备返回false后，跳出去，把获取的设备//路径全记录下来就好了，我这里知道具体设备号，所以没有循环，浪费我时间 //定于句柄序号和一些参数，具体可以去网上找这些API的参数说明，后文我看能不能把资料也写上去 int HidHandle = -1; public const uint GENERIC_READ = 0x80000000; public const uint GENERIC_WRITE = 0x40000000; public const uint FILE_SHARE_READ= 0x00000001; public const uint FILE_SHARE_WRITE = 0x00000002; public const int OPEN_EXISTING = 3;private void UsBMethod(int index) { HidD_GetHidGuid(ref guidHID); hDevInfo = SetupDiGetClassDevs(ref guidHID, 0, IntPtr.Zero, DIGCF.DIGCF_PRESENT | DIGCF.DIGCF_DEVICEINTERFACE); int bufferSize = 0; ArrayList HIDUSBAddress = new ArrayList(); //while (true) //{ //获取设备，true获取到 SP_DEVICE_INTERFACE_DATA DeviceInterfaceData = new SP_DEVICE_INTERFACE_DATA(); DeviceInterfaceData.cbSize = Marshal.SizeOf(DeviceInterfaceData); //for (int i = 0; i < 3; i++) //{ bool result = SetupDiEnumDeviceInterfaces(hDevInfo, IntPtr.Zero, ref guidHID, (UInt32)index, ref DeviceInterfaceData); //} //第一次调用出错，但可以返回正确的Size SP_DEVINFO_DATA strtInterfaceData = new SP_DEVINFO_DATA(); result = SetupDiGetDeviceInterfaceDetail(hDevInfo, ref DeviceInterfaceData, IntPtr.Zero, 0, ref bufferSize, strtInterfaceData); //第二次调用传递返回值，调用即可成功 IntPtr detailDataBuffer = Marshal.AllocHGlobal(bufferSize); SP_DEVICE_INTERFACE_DETAIL_DATA detailData = new SP_DEVICE_INTERFACE_DETAIL_DATA(); detailData.cbSize = Marshal.SizeOf(typeof(SP_DEVICE_INTERFACE_DETAIL_DATA)); Marshal.StructureToPtr(detailData, detailDataBuffer, false); result = SetupDiGetDeviceInterfaceDetail(hDevInfo, ref DeviceInterfaceData, detailDataBuffer, bufferSize, ref bufferSize, strtInterfaceData); if (result == false) { //break; } //获取设备路径访 IntPtr pdevicePathName = (IntPtr)((int)detailDataBuffer + 4); string devicePathName = Marshal.PtrToStringAuto(pdevicePathName); HIDUSBAddress.Add(devicePathName); //index++; //break; //} //连接设备文件 int aa = CT_CreateFile(devicePathName); bool bb = USBDataRead(HidHandle); } //建立和设备的连接 public unsafe int CT_CreateFile(string DeviceName) { HidHandle = CreateFile( DeviceName, GENERIC_READ,// | GENERIC_WRITE,//读写，或者一起 FILE_SHARE_READ,// | FILE_SHARE_WRITE,//共享读写，或者一起 0, OPEN_EXISTING, 0, 0); if (HidHandle == -1) { return 0; } else { return 1; } } //根据CreateFile拿到的设备handle访问文件，并返回数据 public unsafe bool USBDataRead(int handle) { while (true) { uint read = 0; //注意字节的长度，我这里写的是8位，其实可以通过API获取具体的长度，这样安全点， //具体方法我知道，但是没有写，过几天整理完代码，一起给出来 Byte[] m_rd_data = new Byte[8]; bool isread = ReadFile((IntPtr)handle, m_rd_data, (uint)8, ref read, IntPtr.Zero); //这里已经是拿到的数据了 Byte[] m_rd_dataout = new Byte[read]; Array.Copy(m_rd_data, m_rd_dataout, read); } }

OK，如果只是获取USB传过来的数据，这里已经足够了，但是有点要注意，2000和XP如果要获取HID键盘和鼠标的数据，readfile是不行的，；
在Win2000和WinXP下不能用CreateFile+ReadFile/WriteFile的方式来读写标准鼠标和标准键盘的数据，因为它们是系统独占的（Exlusive）。
如果你是其他HID类设备，比如游戏手柄或者自定义HID设备，都可以用上面的方式来收发数据，
怎么访问我暂时也不知道，估计要用它方法，看到有些软件是用截取的手段，估计是用钩子了吧。。

最后忘记引用空间了，其实大家都知道的
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;

 

 

还有获取设备信息的代码，主要是获取报文的长度，要不然每次报文长度换了，又要改代码，其实硬件换了，改下代码还算是正常的

C# code

//获取设备具体信息 [DllImport("hid.dll", SetLastError = true)] private unsafe static extern int HidP_GetCaps( int pPHIDP_PREPARSED_DATA, // IN PHIDP_PREPARSED_DATA PreparsedData, ref HIDP_CAPS myPHIDP_CAPS); // OUT PHIDP_CAPS Capabilities [DllImport("hid.dll", SetLastError = true)] private unsafe static extern int HidD_GetPreparsedData( int hObject, // IN HANDLE HidDeviceObject, ref int pPHIDP_PREPARSED_DATA); // HIDP_CAPS [StructLayout(LayoutKind.Sequential)] public unsafe struct HIDP_CAPS { public System.UInt16 Usage; // USHORT public System.UInt16 UsagePage; // USHORT public System.UInt16 InputReportByteLength; public System.UInt16 OutputReportByteLength; public System.UInt16 FeatureReportByteLength; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public System.UInt16[] Reserved; // USHORT Reserved[17]; public System.UInt16 NumberLinkCollectionNodes; public System.UInt16 NumberInputButtonCaps; public System.UInt16 NumberInputValueCaps; public System.UInt16 NumberInputDataIndices; public System.UInt16 NumberOutputButtonCaps; public System.UInt16 NumberOutputValueCaps; public System.UInt16 NumberOutputDataIndices; public System.UInt16 NumberFeatureButtonCaps; public System.UInt16 NumberFeatureValueCaps; public System.UInt16 NumberFeatureDataIndices; } int reportLength = 8; //获取设备发送的字节的长度(也有其他信息) int myPtrToPreparsedData = -1; int result1 = HidD_GetPreparsedData(handle, ref myPtrToPreparsedData); HIDP_CAPS myHIDP_CAPS = new HIDP_CAPS(); int result2 = HidP_GetCaps(myPtrToPreparsedData, ref myHIDP_CAPS); reportLength = myHIDP_CAPS.InputReportByteLength;

必选先拿到handle，我这里放到CreatFile之后使用就好了