C# 访问USB(HID)设备 二话不说，直接给代码，如果您真想做这方面的东西，还是稍微研究下，没有现成的好类用，就需要自己了解其原理
//以下是调用windows的API的函数 //获得GUID
[DllImport(\
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(\
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(\
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(\
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(\ 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(\ private static extern bool ReadFile (
IntPtr hFile, byte[] lpBuffer,
uint nNumberOfBytesToRead, ref uint lpNumberOfBytesRead, IntPtr lpOverlapped );
//释放设备
[DllImport(\
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(\
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) {
