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I tried to modify the Wiimote Whiteboard app for my final project. but my experience in the programming language C # is very little. in fact I learn C # just a few months.

I do not know what is the meaning of lines of code below. can anyone help me? I've written a few comments to the parts that I do not understand in this code. Please guided me in understanding it. I guess this code to connect the Wiimote device.

       private void Connect(bool DisconnectOld)
        {
            //TODO: honour disconnectold parameter
            BLUETOOTH_DEVICE_INFO device = new BLUETOOTH_DEVICE_INFO();
            device.dwSize = Marshal.SizeOf(typeof(BLUETOOTH_DEVICE_INFO));
            device.szName = "";


        //whether the 9 lines of code below to create a parameter to search the bluetooth device?
        BLUETOOTH_DEVICE_SEARCH_PARAMS searchparams = new BLUETOOTH_DEVICE_SEARCH_PARAMS();

        //what the purpose of one line of code below?
        searchparams.dwSize = Marshal.SizeOf(typeof(BLUETOOTH_DEVICE_SEARCH_PARAMS));
        searchparams.fIssueInquiry = true;
        searchparams.fReturnAuthenticated = true;
        searchparams.fReturnConnected = true;
        searchparams.fReturnRemembered = true;
        searchparams.fReturnUnknown = true;
        searchparams.hRadio = IntPtr.Zero;
        searchparams.cTimeoutMultiplier = 1;


        bool connected = false;

        //what the purpose of one line of code below?
        IntPtr handle = BluetoothFindFirstDevice(ref searchparams, ref device);

        //what the meaning of what IntPtr.Zero?
        if (handle == IntPtr.Zero)
        {
            int lasterror = Marshal.GetLastWin32Error();
            if (lasterror != 0)
                LogError("Bluetooth API returned: " + lasterror.ToString());
        }
        else
        {
            while (true)
            {
                if (Cancel)
                    break;

                if (device.szName.StartsWith("Nintendo RVL"))
                {

                    //whether the function "if" below state that the device once connected?
                    if (device.fRemembered)
                    {
                        BluetoothRemoveDevice(ref device.Address);
                    }
                    else
                    {

                        //what the purpose line of code below?
                        if (BluetoothSetServiceState(IntPtr.Zero, ref device, ref HumanInterfaceDeviceServiceClass_UUID, BLUETOOTH_SERVICE_ENABLE) != 0)
                            LogError("Failed to connect to wiimote controller");
                        else
                            connected = true;
                    }
                    break;
                }

                //why the divice.szName set to null again?
                device.szName = "";
                if (!BluetoothFindNextDevice(handle, ref device))
                    break;
            }
        }

        //what the purpose of line of code below?
        BluetoothFindDeviceClose(handle);
        if (connected && Connected != null)
            Connected(this, EventArgs.Empty);
        else if (ConnectionFailed != null)
            ConnectionFailed(this, EventArgs.Empty);
    }

i'am sorry that my english is very week.

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1 回答 1

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Wiimote 在通过身份验证后会在一段时间后关闭，如果没有及时得到响应。如果在此时间之前未安装 Windows 设备驱动程序，则连接失败。

为了防止这种情况发生，您可以在 Wiimote 中启用 HID 服务。Wiimote 将不再断开连接，而是一直等到 Windows 完成驱动程序安装并且您可以与 Wiimote 交换数据。

于 2015-01-05T11:22:10.793 回答