C#

[StructLayout(LayoutKind.Sequential, Pack=1)]
public class SP_DEVICE_INTERFACE_DETAIL_DATA
{
    public int cbSize;
    public short DevicePath;
}

[DllImport("Setupapi.dll", SetLastError = true)]
public static extern Boolean
    SetupDiGetDeviceInterfaceDetail(
        IntPtr DeviceInfoSet,
        ref SP_DEVICE_INTERFACE_DETAIL_DATA DeviceInterfaceData,
        IntPtr DeviceInterfaceDetailData,
        int DeviceInterfaceDetailDataSize,
        out int RequiredSize,
        IntPtr DeviceInfoData);

public void WDMEnumeration()
{
    StringBuilder DeviceName = new StringBuilder();
    Guid guid = MEDIA_GUID;
    IntPtr NewDeviceInfoSet;
    Win32APIfunctions.SP_DEVINFO_DATA DeviceInfoData= new Win32APIfunctions.SP_DEVINFO_DATA();

    //get device info set for our device class
    NewDeviceInfoSet=Win32APIfunctions.SetupDiGetClassDevsA(ref guid, 0, IntPtr.Zero, DIGCF_PRESENT);

    if( NewDeviceInfoSet.ToInt32() == -1 )
    {
        //device information is unavailable
         throw new System.ApplicationException("device information is unavailable!");
    }

    //iterate over the devices to find SAA7146A
    for(uint uiDeviceIndex=0; uiDeviceIndex<MAXCARDS; uiDeviceIndex++)
    {
        DeviceInfoData.cbSize = 28;
        DeviceInfoData.DevInst=0;
        DeviceInfoData.ClassGuid=System.Guid.Empty;
        DeviceInfoData.Reserved=0;

        bool bResult = Win32APIfunctions.SetupDiEnumDeviceInfo(NewDeviceInfoSet, uiDeviceIndex, DeviceInfoData);
        if(bResult == false)
        {
            //no such device
            Win32APIfunctions.SetupDiDestroyDeviceInfoList(NewDeviceInfoSet);
            throw new System.ApplicationException("no such device!");
        }


        //now get the device name
        DeviceName.Capacity=MAX_DEV_LEN;
        bResult = Win32APIfunctions.SetupDiGetDeviceRegistryPropertyA(NewDeviceInfoSet, DeviceInfoData, SPDRP_FRIENDLYNAME, 0,DeviceName, MAX_DEV_LEN, IntPtr.Zero);

        if(bResult == false)
        {
            bResult = Win32APIfunctions.SetupDiGetDeviceRegistryPropertyA(NewDeviceInfoSet ,DeviceInfoData, SPDRP_DEVICEDESC, 0, DeviceName, MAX_DEV_LEN, IntPtr.Zero);

            if(bResult == false)
            {
                //incorrect device name
                Win32APIfunctions.SetupDiDestroyDeviceInfoList(NewDeviceInfoSet);
                throw new System.ApplicationException("incorrect device name!");
            }
        }

        //check if this is the device we are searching for
        //if(DeviceName.ToString() == DEVICENAME)
        int dummy = DeviceName.ToString().IndexOf("Cinergy");
        if(dummy != -1)
        {
            //now get detailed information

            // First get size of required buffer for detailed information
            Win32APIfunctions.SP_DEVICE_INTERFACE_DETAIL_DATA dummyData = new Win32APIfunctions.SP_DEVICE_INTERFACE_DETAIL_DATA();
            dummyData.cbSize = Marshal.SizeOf(dummyData);
            int iRequiredSize=0;
            Win32APIfunctions.SetupDiGetDeviceInterfaceDetail(NewDeviceInfoSet, ref dummyData, IntPtr.Zero, iRequiredSize, out iRequiredSize, IntPtr.Zero);

            int iLastError = Marshal.GetLastWin32Error();

        }
    }
}