C#调用windows的API函数.doc

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);/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