Question

我目前正在尝试P / Invoke到HID（在Unity中（因此使用.Net 2.0））。但是，在调用SetupDiGetDeviceInterfaceDetail时，它返回错误代码1784.

MIND：这是第二次调用，因为第一次调用应该（并且确实）返回错误122，并设置所需的缓冲区大小。

..Replaced With Full Source Below..

使用结果：

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目前还没有使用DETAIL_DATA，我看到我应该使用IntPtr代替。

如何摆脱我的错误1784并获取/迭代我的设备路径？另外，我读过我应该使用“null”，而不是dData，但这个错误也是如此（无法将null转换为DEVICE_INTERFACE_DATA）

编辑：完整的来源

DebugInput.cs：

using UnityEngine;
using System.Collections;
using System;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
using Assets;

public class DebugInput : MonoBehaviour {
    static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);
    // Use this for initialization
    void Start () {

    }

    // Update is called once per frame
    void Update () {
        if (Input.GetKeyDown(KeyCode.F3))
        {
            Debug.Log("Checking");
            WindowsHID hid = new WindowsHID();
            Guid gHid = hid.HIDGuid; // "4d1e55b2-f16f-11cf-88cb-001111000030"
            Debug.Log(gHid);
            IntPtr hDevInfo = hid.GetClassDevs(gHid); // 475463200L
            if (hDevInfo != INVALID_HANDLE_VALUE)
            {
                Debug.Log("INTPTR RETREIVED");
                WindowsHID.DEVICE_INTERFACE_DATA diData = new WindowsHID.DEVICE_INTERFACE_DATA();
                diData.cbSize = Marshal.SizeOf(diData); // 32


                Boolean Check = false;
                uint enumerator = 0;
                Check = hid.SetupInterfaces(hDevInfo, IntPtr.Zero, ref gHid, enumerator, ref diData); // Check = True, hDevInfo = 475463200L, diData.reserved = 653193792L (hDevInfo changes on each rebuild)
                uint sizeNeeded;
                WindowsHID.DEVINFO_DATA dData = new WindowsHID.DEVINFO_DATA();
                dData.cbSize = (uint)Marshal.SizeOf(dData); // 32u

                bool result3 = WindowsHID.SetupDiGetDeviceInterfaceDetail(hDevInfo, diData, IntPtr.Zero, 0, out sizeNeeded, dData); // sizeNeeded becomes 180u
                if (!result3)
                {
                    int error = Marshal.GetLastWin32Error(); // Expecting error 122, since we are only setting SizeNeeded Here (getting error 122)
                    Debug.Log(error);
                }
                IntPtr DeviceInterfaceDetailData = Marshal.AllocHGlobal((int)sizeNeeded); // 4640736L

                try
                {
                    uint size = sizeNeeded; // 180u
                    Marshal.WriteInt32(DeviceInterfaceDetailData, (int)size); // DevinceInterfaceDetailData doesnt change (IS THIS LINE NEEDED?)
                    bool result4 = WindowsHID.SetupDiGetDeviceInterfaceDetail(hDevInfo, diData, DeviceInterfaceDetailData, size, out sizeNeeded, dData);
                    if (!result4)
                    {
                        int error = Marshal.GetLastWin32Error(); // GETTING ERROR 1784???
                        Debug.Log(error);
                    }
                }
                finally
                {
                    Marshal.FreeHGlobal(DeviceInterfaceDetailData);
                }                
            }
            else
            {
                Debug.Log("INVALID GUID");
            }            
        }
    }
}

WindowsHID.cs：

using UnityEngine;
using System;
using System.Runtime.InteropServices;
using System.Collections;

namespace Assets
{
    public class WindowsHID
    {
        /// <summary>Used in SetupDiClassDevs to get devices present in the system</summary>
        protected const int DIGCF_PRESENT = 0x02;
        /// <summary>Used in SetupDiClassDevs to get device interface details</summary>
        protected const int DIGCF_DEVICEINTERFACE = 0x10;
        protected const int DIGCF_ALLCLASSES = 0x04;
        static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);
        public WindowsHID()
        {

        }

        /// <summary>
        /// Provides Info About a Single USB-Device
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        public struct DEVICE_INTERFACE_DATA
        {
            public Int32 cbSize;
            public Guid interfaceClassGuid;
            public Int32 flags;
            public UIntPtr reserved;
        }

        [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto, Pack=1)]
        public struct DEVICE_INTERFACE_DETAIL_DATA
        {
            public int cbSize;
            public char DevicePath;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct DEVINFO_DATA
        {
            public uint cbSize;
            public Guid classGuid;
            public uint devInst;
            public IntPtr reserved;
        }        

        #region P/Invoke
        /// <summary>
        /// Gets the Windows GUID for the HID class Devices
        /// </summary>
        /// <param name="guid"></param>
        [DllImport("hid.dll", SetLastError = true)]
        protected static extern void HidD_GetHidGuid(out Guid guid);

        /// <summary>
        /// 
        /// </summary>
        /// <param name="ClassGuid"></param>
        /// <param name="Enumerator"></param>
        /// <param name="hwndParent"></param>
        /// <param name="Flags"></param>
        /// <returns></returns>
        [DllImport("setupapi.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern IntPtr SetupDiGetClassDevs(ref Guid ClassGuid, [MarshalAs(UnmanagedType.LPTStr)] string Enumerator, IntPtr hwndParent, uint Flags);

        /// <summary>
        /// 
        /// </summary>
        /// <param name="hDevInfo"></param>
        /// <param name="devInfo"></param>
        /// <param name="interfaceClassGuid"></param>
        /// <param name="memberIndex"></param>
        /// <param name="deviceInterfaceData"></param>
        /// <returns></returns>
        [DllImport("setupapi.dll", SetLastError = true)]
        protected static extern Boolean SetupDiEnumDeviceInterfaces(IntPtr hDevInfo, int devInfo, ref Guid interfaceClassGuid, uint memberIndex, ref DEVICE_INTERFACE_DATA deviceInterfaceData);

        /// <summary>
        /// 
        /// </summary>
        /// <param name="hDevInfo"></param>
        /// <param name="deviceInterfaceData"></param>
        /// <param name="deviceInterfaceDetailData"></param>
        /// <param name="deviceInterfaceDetailDataSize"></param>
        /// <param name="requiredSize"></param>
        /// <param name="deviceInfoData"></param>
        /// <returns></returns>
        [DllImport("setupapi.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern Boolean SetupDiGetDeviceInterfaceDetail(IntPtr hDevInfo, DEVICE_INTERFACE_DATA deviceInterfaceData, IntPtr deviceInterfaceDetailData, uint deviceInterfaceDetailDataSize, out uint requiredSize, DEVINFO_DATA deviceInfoData);
        #endregion

        public Guid HIDGuid
        {
            get
            {
                Guid gHid;
                HidD_GetHidGuid(out gHid);
                return gHid;
            }
        }

        public IntPtr GetClassDevs(Guid gHid)
        {
            return SetupDiGetClassDevs(ref gHid, null, IntPtr.Zero, DIGCF_DEVICEINTERFACE);// | DIGCF_ALLCLASSES);
        }

        public Boolean SetupInterfaces(IntPtr hDevInfo, IntPtr devInfo, ref Guid interfaceClassGuid, uint memberIndex, ref DEVICE_INTERFACE_DATA deviceInterfaceData)
        {
            Boolean res = SetupDiEnumDeviceInterfaces(hDevInfo, 0, ref interfaceClassGuid, memberIndex, ref deviceInterfaceData);
            int a = Marshal.GetLastWin32Error();
            return res;
        }    

        public Boolean SetupInterfaceDetail(IntPtr hDevInfo, DEVICE_INTERFACE_DATA deviceInterfaceData, IntPtr deviceInterfaceDetailData, uint deviceInterfaceDetailDataSize, out uint requiredSize, DEVINFO_DATA deviceInfoData)
        {
            Boolean a = SetupDiGetDeviceInterfaceDetail(hDevInfo, deviceInterfaceData, deviceInterfaceDetailData, deviceInterfaceDetailDataSize, out requiredSize, deviceInfoData);
            int b = Marshal.GetLastWin32Error();
            return a;
        }
    }
}

Answer 1

您需要替换以下行：

Marshal.WriteInt32(DeviceInterfaceDetailData, (int)size);

通过

Marshal.WriteInt32(DeviceInterfaceDetailData, IntPtr.Size == 8 ? 8 : 6);

因为SetupDiGetDeviceInterfaceDetail文档明确说明了这一点：

调用者必须将DeviceInterfaceDetailData.cbSize设置为调用此函数之前的sizeof（SP_DEVICE_INTERFACE_DETAIL_DATA）。 cbSize成员始终包含固定部分的大小数据结构，而不是反映可变长度字符串的大小结束。

sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA)取决于进程位数，它是带有X86进程的6（字节打包+ 1个字符，auto - ＆gt; unicode - ＆gt; 4 + 2 * 1）和8和X64进程（无论如何都是8字节打包）。

另请注意，您对SetupDiGetDeviceInterfaceDetail的定义应使用结构的ref参数。一旦你改变了所有这些，就可以获得这样的设备路径：

string devicePath = Marshal.PtrToStringAuto(DeviceInterfaceDetailData + 4);

（PtrToStringAuto因为您在p / invoke定义中选择了自动字符集）

P / Invoke SetupDiGetDeviceInterfaceDetail返回1784

1 个答案: