c# - 如何使用蓝牙套接字从游戏 Controller 接收按钮事件？

Question

目前我与游戏 Controller 的蓝牙连接正常。现在我正试图捕捉按钮事件，但这并不容易。我有以下代码:

    private Stream mmInStream;
    private Stream mmOutStream;

    public BluetoothController()
    {

    }

    public void Read(BluetoothSocket socket)
    {
        Stream tmpIn = null;
        Stream tmpOut = null;

        try
        {
            tmpIn = socket.InputStream;
            tmpOut = socket.OutputStream;
        }
        catch (IOException ex)
        {
            throw ex;
        }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;

        Thread thread = new Thread(new ThreadStart(Run));
        thread.Start();
    }

    protected void Run()
    {
        byte[] buffer = new byte[1024];
        int bytes;

        while (true)
        {
            try
            {
                // Thanks to @spaceplane
                if (mmInStream.IsDataAvailable())
                {
                    // Read from the InputStream
                    bytes = mmInStream.Read(buffer, 0, buffer.Length);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }

当我按下游戏 Controller 上的按钮时，它不会进入下一行:

if (mmInStream.IsDataAvailable())

这里有什么问题吗？

Answer 1

mmInStream.read() 如果流中当前没有数据可供读取，则阻塞。因此，如果没有数据，它就会卡在那里等待。在从流中读取之前，您应该检查是否有任何可用数据。变化

bytes = mmInStream.Read(buffer, 0, buffer.Length);

到

if(mmInStream.available() > 0) {
  bytes = mmInStream.Read(buffer, 0, buffer.Length);
}