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我正在使用该SetupDiEnumDeviceInterfaces函数来获取设备信息集中包含的设备接口。但是 GUID 没有通过“ SP_DEVICE_INTERFACE_DATA”结构。这是我的代码片段。

我试图通过使用来查看问题所在。GetLastError它总是返回零。

//GUID.
GetHidGuid(Myguid)

[DllImport("hid.dll", SetLastError = true)]
    static extern unsafe void GetHidGuid(
         ref GUID lpHidGuid);

 [StructLayout(LayoutKind.Sequential)]
    public unsafe struct GUID
    {
        public int Data1;
        public System.UInt16 Data2;
        public System.UInt16 Data3;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
        public byte[] data4;
    }

// SetupDiEnumDeviceInterfaces function.

public unsafe int CT_SetupDiEnumDeviceInterfaces(int memberIndex)
    {
        int ErrorStatus;
        mySP_DEVICE_INTERFACE_DATA = new SP_DEVICE_INTERFACE_DATA();--> here is where i Have problem.GUID is zero.

        mySP_DEVICE_INTERFACE_DATA.cbSize = Marshal.SizeOf(mySP_DEVICE_INTERFACE_DATA);
        int result = SetupDiEnumDeviceInterfaces(
            hDevInfo,
            0,
            ref  MYguid,
            memberIndex,
            ref mySP_DEVICE_INTERFACE_DATA);
        return result;
        ErrorStatus = System.Runtime.InteropServices.Marshal.GetLastWin32Error();
    }

    public unsafe struct SP_DEVICE_INTERFACE_DATA
    {
        public int cbSize;
        public GUID InterfaceClassGuid;
        public int Flags;
        public int Reserved;
    }

任何帮助表示赞赏。谢谢你的建议。

4

1 回答 1

1

从pInvoke看来，您GetHidGuid应该声明为

[DllImport("hid.dll", EntryPoint="HidD_GetHidGuid", SetLastError=true)]
static extern void HidD_GetHidGuid(out Guid hidGuid);

另一个完整的例子是here

于 2012-09-25T15:56:28.213 回答