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我正在尝试在 C# 应用程序中使用32feet.NET蓝牙库来检测附近的设备。我的小应用程序的目的是使用人们手机的蓝牙功能让 PC 知道房间里有谁。

做这样的事情的最好方法是让我想要“跟踪”的设备连接一次,然后不断检查它们是否可以通过蓝牙检测到。

现在我的问题:

  1. 我是否需要将设备与我的应用程序配对或验证?如何使用 32feet.NET 在 C# 中执行此操作?

  2. 如何持续检查范围内的设备并将它们与存储的设备进行比较?

我知道所有这些可能都在库文档中,但是对我来说真的很难阅读,而且大多数示例似乎都在 VB 中,我不知道并且很难翻译成 C#(尤其是在涉及到AsyncCallbacks 等)。

如果有人能推动我朝着正确的方向前进,我会非常高兴!

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2 回答 2

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前面有几个警告,我假设您不是在这里处理 HID 设备,它们通常由操作系统处理。我也刚刚开始使用 32feet,我正在使用它来创建与蓝牙条码扫描仪上的串行端口服务的连接,因此可能有更好的方法可以满足您的需求,但这可能会为您指明正确的入门方向.

您需要配对设备,是的。如果您在 WinForms 应用程序中使用它,实际上您可以显示处理扫描设备并让您选择一个的表单,如下所示:

bool PairDevice()
{
    using (var discoverForm = new SelectBluetoothDeviceDialog())
    {
        if (discoverForm.ShowDialog(this) != DialogResult.OK)
        {
            // no device selected
            return false;
        }

        BluetoothDeviceInfo deviceInfo = discoverForm.SelectedDevice;

        if (!deviceInfo.Authenticated) // previously paired?
        {
            // TODO: show a dialog with a PIN/discover the device PIN
            if (!BluetoothSecurity.PairDevice(deviceInfo.DeviceAddress, myPin)) 
            {
                // not previously paired and attempt to pair failed
                return false;
            }
        }

        // device should now be paired with the OS so make a connection to it asynchronously
        var client = new BluetoothClient();
        client.BeginConnect(deviceInfo.DeviceAddress, BluetoothService.SerialPort, this.BluetoothClientConnectCallback, client);

        return true;
    }
}

void BluetoothClientConnectCallback(IAsyncResult result)
{
    var client = (BluetoothClient)result.State;
    client.EndConnect();

    // get the client's stream and do whatever reading/writing you want to do.
    // if you want to maintain the connection then calls to Read() on the client's stream should block when awaiting data from the device

    // when you're done reading/writing and want to close the connection or the device servers the connection control flow will resume here and you need to tidy up
    client.Close();
}

到目前为止,最好的方法是,如果您的设备正在广播它们可用于连接,则设置一个BluetoothListener将持续侦听广播设备的设备,当找到一个设备时,您将获得一个BluetoothClient可以使用的实例与您第一次配对时相同:

void SetupListener()
{
    var listener = new BluetoothListener(BluetoothService.SerialPort);
    listener.Start();
    listener.BeginAcceptBluetoothClient(this.BluetoothListenerAcceptClientCallback, listener);
}


void BluetoothListenerAcceptClientCallback(IAsyncResult result)
{
    var listener = (BluetoothListener)result.State;

    // continue listening for other broadcasting devices
    listener.BeginAcceptBluetoothClient(this.BluetoothListenerAcceptClientCallback, listener);

    // create a connection to the device that's just been found
    BluetoothClient client = listener.EndAcceptBluetoothClient();

    // the method we're in is already asynchronous and it's already connected to the client (via EndAcceptBluetoothClient) so there's no need to call BeginConnect

    // TODO: perform your reading/writing as you did in the first code sample

    client.Close();
}

如果您的设备没有为连接进行广播,那么吸引力不大,但很有用,您可以创建一个新BluetoothClient设备并要求它返回它可以找到的所有设备:

void ScanForBluetoothClients()
{
    var client = new BluetoothClient();
    BluetoothDeviceInfo[] availableDevices = client.DiscoverDevices(); // I've found this to be SLOW!

    foreach (BluetoothDeviceInfo device in availableDevices)
    {
        if (!device.Authenticated)
        {
            continue;
        }

        var peerClient = new BluetoothClient();
        peerClient.BeginConnect(deviceInfo.DeviceAddress, BluetoothService.SerialPort, this.BluetoothClientConnectCallback, peerClient);
    }
}
于 2011-10-14T22:37:30.450 回答
1

这不是答案,但我无法将这么多代码放在评论部分。更改这些代码行:

//continue listening for other broadcasting devices
listener.BeginAcceptBluetoothClient(this.BluetoothListenerAcceptClientCallback, listener);

// create a connection to the device that's just been found
BluetoothClient client = listener.EndAcceptBluetoothClient();


// create a connection to the device that's just been found
BluetoothClient client = listener.EndAcceptBluetoothClient();

// continue listening for other broadcasting devices
listener.BeginAcceptBluetoothClient(this.BluetoothListenerAcceptClientCallback, listener);

基本上,改变代码的顺序。。
至于每次调用 BeginXXXX 方法必须有下一个 EndXXXX。以上所有代码,您都在尝试 BeginAcceptBluetoothClient已经开始“BeginAcceptBluetoothClient”。

希望你能理解。

于 2012-10-27T16:08:43.570 回答