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问SetupDiEnumDeviceInterfaces()总是返回false - C# WPF
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Stack Overflow用户

提问于 2014-04-10 10:16:30

回答 1查看 1.1K关注 0票数 0

我正在尝试使用以下代码连接到在我的系统上被检测为CDC设备的USB设备：(我只提供了与我的问题相关的代码部分)代码编译得很好，SetupDiGetClassDevs函数也运行正常。但是SetupDiEnumDeviceInterfaces总是返回false，因此我不能再往下走了。请告诉我哪里错了。谢谢。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Runtime.InteropServices;
using System.IO.Ports;

//**************************************************************
// Static class for access to USB dll for all the activity 
// related to USB device
//**************************************************************
namespace USBDeviceConnect
{

#region Unmanaged

public class Native
{
    [DllImport("setupapi.dll", CharSet = CharSet.Auto)]
    public static extern IntPtr SetupDiGetClassDevs(
        ref Guid ClassGuid,
           IntPtr Enumerator,
        IntPtr hwndParent,
        UInt32 Flags);

    [DllImport("setupapi.dll", CharSet = CharSet.Auto)]
    public static extern bool SetupDiEnumDeviceInterfaces(
        IntPtr hDevInfo,
        SP_DEVINFO_DATA devInfo,
        ref Guid interfaceClassGuid,
        UInt32 memberIndex,
        ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData);

    [DllImport(@"setupapi.dll", CharSet = CharSet.Auto)]
    public static extern Boolean SetupDiEnumDeviceInterfaces(
       IntPtr hDevInfo,
       IntPtr devInfo,
       ref Guid interfaceClassGuid,
       UInt32 memberIndex,
       ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData);

    [DllImport("setupapi.dll", CharSet = CharSet.Auto)]
    public static extern int SetupDiDestroyDeviceInfoList(
           IntPtr DeviceInfoSet);
    [DllImport("setupapi.dll", CharSet = CharSet.Auto)]
    public static extern bool SetupDiEnumDeviceInfo(
       IntPtr DeviceInfoSet,
       UInt32 MemberIndex,
       ref SP_DEVINFO_DATA DeviceInfoData);

    //SP_DEVINFO_DATA
    [StructLayout(LayoutKind.Sequential)]
    public struct SP_DEVINFO_DATA
    {
        public int cbSize;
        public Guid ClassGuid;
        public int DevInst;
        public ulong Reserved;
    }

    [StructLayout(LayoutKind.Sequential)]
    public class SP_DEVICE_INTERFACE_DATA
    {
        public int cbSize;
        public Guid interfaceClassGuid;
        public int flags;
        public ulong reserved;
    };
    //PARMS
    public const int DIGCF_ALLCLASSES = (0x00000004);
    public const int DIGCF_PRESENT = (0x00000002);
    public const int DIGCF_PROFILE = (0x00000008);
    public const int DIGCF_DEVICEINTERFACE = (0x00000010);
    public const int INVALID_HANDLE_VALUE = -1;
    public const int MAX_DEV_LEN = 1000;
    public const int DEVICE_NOTIFY_WINDOW_HANDLE = (0x00000000);
    public const int DEVICE_NOTIFY_SERVICE_HANDLE = (0x00000001);
    public const int DEVICE_NOTIFY_ALL_INTERFACE_CLASSES = (0x00000004);
    public const int DBT_DEVTYP_DEVICEINTERFACE = (0x00000005);
    public const int DBT_DEVNODES_CHANGED = (0x0007);
    public const int WM_DEVICECHANGE = (0x0219);
    public const int DIF_PROPERTYCHANGE = (0x00000012);
    public const int DICS_FLAG_GLOBAL = (0x00000001);
    public const int DICS_FLAG_CONFIGSPECIFIC = (0x00000002);
    public const int DICS_ENABLE = (0x00000001);
    public const int DICS_DISABLE = (0x00000002);
    public const long ERROR_NO_MORE_ITEMS = 259L;
    public const int ERROR_SUCCESS = 0;

}
#endregion
/****************************************************************************/
static class AccessUSB
{
    public static void Main()
    {
        ConnectToDevice();
    }

    /* Execution starts here */
    public static void ConnectToDevice()
    {
        /* Get the info of all connected devices */
        //Globally Unique Identifier (GUID) for CDC class devices.

        Guid InterfaceClassGuid = new Guid("a5dcbf10653011d2901f00c04fb951ed");
        IntPtr DeviceInfoTable = (IntPtr)Native.INVALID_HANDLE_VALUE;
        Native.SP_DEVICE_INTERFACE_DATA InterfaceDataStructure = new Native.SP_DEVICE_INTERFACE_DATA();
        Native.SP_DEVINFO_DATA DevInfoData = new Native.SP_DEVINFO_DATA();

        uint InterfaceIndex = 0;
        uint ErrorStatus;
        StringBuilder DeviceName = new StringBuilder();

        DeviceInfoTable = Native.SetupDiGetClassDevs(ref InterfaceClassGuid, IntPtr.Zero, IntPtr.Zero, Native.DIGCF_PRESENT | Native.DIGCF_DEVICEINTERFACE);

        if (DeviceInfoTable.ToInt32() != Native.INVALID_HANDLE_VALUE)
        {
            //Initialize an appropriate SP_DEVINFO_DATA structure.
            DevInfoData.cbSize = Marshal.SizeOf(DevInfoData);
            while (true)
            {
                InterfaceDataStructure.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(InterfaceDataStructure);
                bool bRslt = Native.SetupDiEnumDeviceInterfaces(DeviceInfoTable, IntPtr.Zero, ref InterfaceClassGuid, InterfaceIndex, ref InterfaceDataStructure);
                if (bRslt == true)
                {
                    ErrorStatus = (uint)System.Runtime.InteropServices.Marshal.GetLastWin32Error();

                    if (Native.ERROR_NO_MORE_ITEMS == ErrorStatus)
                    {
                        Native.SetupDiDestroyDeviceInfoList(DeviceInfoTable);//Clean up the old structure we no longer need.
                        return;
                    }
                }
                else    //Else some other kind of unknown error ocurred...
                {
                    ErrorStatus = (uint)System.Runtime.InteropServices.Marshal.GetLastWin32Error();
                    Native.SetupDiDestroyDeviceInfoList(DeviceInfoTable);   //Clean up the old structure we no longer need.
                    return;
                }

                InterfaceIndex++;

            }//end of while(true)
        }
    }
}

}