[英]Converting code to find USB devices from C++ to C#
我已經用C ++給出了一些代碼,該代碼可以找到連接的USB設備並使用setupapi.h為它們生成一些詳細的輸出信息。
char * myClass::getUSBData(){
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i;
// Create a HDEVINFO with all present devices.
static GUID GUID_DEVINTERFACE_USB_DEVICE ={ 0xA5DCBF10L, 0x6530, 0x11D2, { 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED } };
hDevInfo = SetupDiGetClassDevs(&GUID_DEVINTERFACE_USB_DEVICE, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
if (hDevInfo == INVALID_HANDLE_VALUE)
{
// Insert error handling here.
return "";
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
string jsonReturn="";
int count = 0;
for (i=0;SetupDiEnumDeviceInfo(hDevInfo,i,
&DeviceInfoData);i++)
{
//actions i removed for the post
}
}
我發現一些代碼在c#中做了類似的事情,並對其進行了適當的修改(我相信),下面的代碼
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
namespace ConsoleApplication1
{
enum DigcfConstants : int
{
DIGCF_DEFAULT = 0x00000001,
DIGCF_PRESENT = 0x00000002,
DIGCF_ALLCLASSES = 0x00000004,
DIGCF_PROFILE = 0x00000008,
DIGCF_DEVICEINTERFACE = 0x00000010
}
[StructLayout(LayoutKind.Sequential)]
struct SP_DEVINFO_DATA
{
public int cbSize;
public GUID ClassGuid;
public int DevInst; // DEVINST handle
public UIntPtr Reserved; // this is type'd as a pointer to a ULong in setupapi.h, however, in C/C++ a long is a DWord
}
[StructLayout(LayoutKind.Sequential, Size = 0x10)]
public struct GUID
{
public Int64 Data1;
public Int16 Data2;
public Int16 Data3;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public byte[] Data4;
public GUID(Int64 d1, Int16 d2, Int16 d3, byte[] d4)
{
Data1 = d1;
Data2 = d2;
Data3 = d3;
Data4 = new byte[8];
Array.Copy(d4, Data4, d4.Length);
}
}
class NativeMethods
{
[DllImport("Kernel32.dll")]
public static extern int GetLastError();
[DllImport("Setupapi.dll", SetLastError = true)]
public static extern IntPtr SetupDiGetClassDevs(ref GUID guid, string enumerator, IntPtr parentHandle, int flags);
[DllImport("Setupapi.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern unsafe bool SetupDiEnumDeviceInfo(IntPtr handle, int index, ref SP_DEVINFO_DATA spDevInfoData);
}
class Program
{
public static unsafe void Main(string[] args)
{
GUID ddClassGuid;
unchecked
{
// GUID_DEVINTERFACE_DISK
ddClassGuid = new GUID(0xA5DCBF10L, (short)0x6530, 0x11D2, new byte[] { 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED });
}
IntPtr devList = NativeMethods.SetupDiGetClassDevs(ref ddClassGuid, null, IntPtr.Zero, (int)DigcfConstants.DIGCF_PRESENT | (int)DigcfConstants.DIGCF_DEVICEINTERFACE);
if (devList.ToInt32() == -1)
{
Console.WriteLine("INVALID_HANDLE_VALUE");
return;
}
else
{
Console.WriteLine("FOUND DEVICE");
int index = 0;
SP_DEVINFO_DATA sdd = new SP_DEVINFO_DATA();
Console.WriteLine("cbSize = {0}", sdd.cbSize);
bool test = NativeMethods.SetupDiEnumDeviceInfo(devList, index, ref sdd);
while (NativeMethods.SetupDiEnumDeviceInfo(devList, index, ref sdd))
{
Console.WriteLine("cbSize = {0}", sdd.cbSize);
index++;
}
//NativeMethods.SetupDiDestroyDeviceInfoList(devList);
Console.ReadLine();
}
}
}
}
找到設備后,它進入else語句,但是NativeMethods.SetupDiEnumDeviceInfo
始終返回false。 我認為這意味着我發送的參數存在問題,但無法弄清楚。
非常感謝您提供有關如何退回連接設備的任何幫助。
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