Question

最近，我想用C＃来获取HID设备。但我遇到了一些麻烦。

当我使用SetupDiGetDeviceInterfaceDetail（）函数时，我会得到错误的路径。

我的获取路径功能代码如下。

private string GetDevicePath(IntPtr hDeviceInfo, ref SP_DEVICE_INTERFACE_DATA devInterfaceData)
    {
        uint nRequiredSize = 0;
        //basically, the first device detailed will return the false... it the really thing.
        if (!SetupDiGetDeviceInterfaceDetail(hDeviceInfo, ref devInterfaceData, IntPtr.Zero, (uint)0, ref nRequiredSize, IntPtr.Zero))
        {

            ///Declare Sample 3:
            SP_DEVICE_INTERFACE_DETAIL_DATA oDevInterfaceDetailedData = new SP_DEVICE_INTERFACE_DETAIL_DATA();
            //Create Buffer to save the path detailed.
            oDevInterfaceDetailedData.cbSize = 5; //=5

            ///With Sample 3:
            if (SetupDiGetDeviceInterfaceDetail(hDeviceInfo, ref devInterfaceData,ref oDevInterfaceDetailedData, nRequiredSize, ref nRequiredSize, IntPtr.Zero))
            {
                //FIXME: Problem 1: The CreateFile will return 123. its means The filename, directory name, or volume label syntax is incorrect.
                //https://msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx

                ///With Sample 3:
                Log.Text += ("Acutal Path = "+ oDevInterfaceDetailedData.DevicePath + "\n");
                return oDevInterfaceDetailedData.DevicePath;
            }
        }
        return null;
    }

问题在于：oDevInterfaceDetailedData.DevicePath

字符串变量将显示如下消息。

Acutal Path = 屜尿楨⍤楶彤㌰て瀦摩ㅟ㐰⌱☶㐱㡡㈶搷〦〦〰⌰㑻ㅤ㕥戵ⴲㅦ昶ㄭ挱ⵦ㠸扣〭㄰ㄱ〱〰㌰細

我的功能/结构声明如下

    [DllImport("setupapi.dll", SetLastError = true)]
    protected static extern bool SetupDiGetDeviceInterfaceDetail(IntPtr lpDeviceInfoSet, ref SP_DEVICE_INTERFACE_DATA oInterfaceData, ref SP_DEVICE_INTERFACE_DETAIL_DATA lpDeviceInterfaceDetailData, uint nDeviceInterfaceDetailDataSize, ref uint nRequiredSize, IntPtr lpDeviceInfoData);

    [DllImport("setupapi.dll", SetLastError = true)]
    protected static extern bool SetupDiGetDeviceInterfaceDetail(IntPtr lpDeviceInfoSet, ref SP_DEVICE_INTERFACE_DATA oInterfaceData, IntPtr lpDeviceInterfaceDetailData, uint nDeviceInterfaceDetailDataSize, ref uint nRequiredSize, IntPtr lpDeviceInfoData);[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

    public struct SP_DEVICE_INTERFACE_DETAIL_DATA
    {
        public uint cbSize;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
        public string DevicePath;
    }

我的平台是64位Windows操作系统。我使用VS2017 IDE在C＃中构建一个WPF项目。

有人可以帮助我找出问题是.....非常感谢

Answer 1

您尝试使用代码：

[DllImport（@＆＃34; setupapi.dll＆＃34;，CharSet = CharSet.Auto，SetLastError = true）]

public static extern Boolean SetupDiGetDeviceInterfaceDetail（ IntPtr hDevInfo， ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData， IntPtr deviceInterfaceDetailData， UInt32 deviceInterfaceDetailDataSize， out UInt32 requiredSize， IntPtr deviceInfoData ）;
感兴趣的人参考。 here
And here

Answer 2

感谢Hans Passant。

我最终修改了SP_DEVICE_INTERFACE_DETAIL_DATA结构。

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
    public struct SP_DEVICE_INTERFACE_DETAIL_DATA
    {
        public uint cbSize;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
        public string DevicePath;
    }

CharSet需要使用ansi而不是auto ...

C＃ - SetupDiGetDeviceInterfaceDetail将获得奇怪的String

2 个答案: