81 lines
2.5 KiB
C#
81 lines
2.5 KiB
C#
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using System;
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using System.IO;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using Windows.Devices.Bluetooth;
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using Windows.Devices.Bluetooth.Rfcomm;
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using Windows.Networking;
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using Windows.Networking.Sockets;
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namespace Plane.Communication
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{
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/// <summary>
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/// 提供蓝牙通信的能力。
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/// </summary>
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public class BluetoothConnection : StreamSocketConnection
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{
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private const uint ErrorCodeDeviceTurnedOff = 0x8007048F;
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private const uint ErrorCodeNotFoundElement = 0x80070490;
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private HostName _remoteHostName;
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public BluetoothConnection(string hostName) : this(new HostName(hostName))
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{
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}
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public BluetoothConnection(HostName hostName)
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{
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_remoteHostName = hostName;
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}
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public override async Task OpenAsync()
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{
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Close();
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_socket = new StreamSocket();
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var chatService = await FilterDevice(hostName: _remoteHostName);
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if (chatService != null)
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{
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var cancellationTokenSource = new CancellationTokenSource(3000);
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var cancellationToken = cancellationTokenSource.Token;
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try
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{
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await Task.Run(async () => await _socket.ConnectAsync(chatService.ConnectionHostName, chatService.ConnectionServiceName), cancellationToken);
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IsOpen = true;
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_inputStream = _socket.InputStream;
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_outputStream = _socket.OutputStream.AsStreamForWrite();
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}
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catch (TaskCanceledException)
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{
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throw new TimeoutException();
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}
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}
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else
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{
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throw new PlatformNotSupportedException("找不到匹配的蓝牙服务设备！");
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}
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}
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private async Task<RfcommDeviceService> FilterDevice(HostName hostName)
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{
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try
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{
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var blthDevice = await BluetoothDevice.FromHostNameAsync(hostName);//获取蓝牙设备
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return blthDevice.RfcommServices.FirstOrDefault();//获取Rfcomm服务对象
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}
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catch (Exception ex)
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{
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if ((uint)ex.HResult == ErrorCodeNotFoundElement)
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{
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return null;
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}
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else
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{
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throw new Exception(ex.Message + "hostName:" + hostName);
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}
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}
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}
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}
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}
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