前面有几点需要注意,我假设您在这里处理的不是 HID 设备,它们通常由操作系统处理。我也才刚刚开始使用 32feet,我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来满足您的需求,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,实际上您可以显示一个表单来处理设备扫描并让您选择一个,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,如果您的设备正在广播它们可以用于连接,最好的方法是设置一个BluetoothListener
它将持续侦听广播设备,当找到一个时,您将得到一个BluetoothClient
您可以使用与第一次配对时相同的实例:
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();
}
不太吸引人,但如果您的设备不广播连接,则很有用,您可以创建一个新的BluetoothClient
并要求它返回它能找到的所有设备:
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);
}
}