1

我被要求编写一个程序来检测是否使用设备的 VID 和 PID 连接了特定的隐藏设备。所以我想出了下面的这个功能：

    public static HIDDevice FindDevice(int nVid, int nPid, Type oType) 
    {
        string strPath = string.Empty;
        string strSearch = string.Format("vid_{0:x4}&pid_{1:x4}", nVid, nPid); // first, build the path search string
        Guid gHid;
        HidD_GetHidGuid(out gHid);  // next, get the GUID from Windows that it uses to represent the HID USB interface
        IntPtr hInfoSet = SetupDiGetClassDevs(ref gHid, null, IntPtr.Zero, DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);  // this gets a list of all HID devices currently connected to the computer (InfoSet)
        try
        {
            DeviceInterfaceData oInterface = new DeviceInterfaceData(); // build up a device interface data block
            oInterface.Size = Marshal.SizeOf(oInterface);
            // Now iterate through the InfoSet memory block assigned within Windows in the call to SetupDiGetClassDevs
            // to get device details for each device connected
            int nIndex = 0;
            while (SetupDiEnumDeviceInterfaces(hInfoSet, 0, ref gHid, (uint)nIndex, ref oInterface))    // this gets the device interface information for a device at index 'nIndex' in the memory block
            {
                string strDevicePath = GetDevicePath(hInfoSet, ref oInterface); // get the device path (see helper method 'GetDevicePath')
                if (strDevicePath.IndexOf(strSearch) >= 0)  // do a string search, if we find the VID/PID string then we found our device!
                {
                    HIDDevice oNewDevice = (HIDDevice)Activator.CreateInstance(oType);  // create an instance of the class for this device
                    oNewDevice.Initialise(strDevicePath);   // initialise it with the device path
                    return oNewDevice;  // and return it
                }
                nIndex++;   // if we get here, we didn't find our device. So move on to the next one.
            }
        }
        finally
        {
            // Before we go, we have to free up the InfoSet memory reserved by SetupDiGetClassDevs
            SetupDiDestroyDeviceInfoList(hInfoSet);
        }

        return null;    // oops, didn't find our device
    }

现在在调用该函数之前，我尝试将 FindDevice 函数返回的 HID 设备转换为我正在使用的设备，如下所示：

public static TD4PAIHandsetDevice FindTD4PAIHandset()
    {
        return (TD4PAIHandsetDevice)FindDevice(0x10C4, 0xEA80, typeof(TD4PAIHandsetDevice));
    }

然后我像这样调用函数：

private TD4PAIHandsetDevice m_oTD4PAIDevice = null;
m_oTD4PAIDevice = TD4PAIHandsetDevice.FindTD4PAIHandset();

我的问题是，m_oTD4PAIDevice当我在 64 位机器上运行它时总是为空，但在 32 位机器上运行良好。我应该做些什么让它在 64 位和 32 位机器上工作？

任何建议将不胜感激

4

0 回答 0