如何使用windowsphone 8从蓝牙设备连续读取数据

本文关键字：连续 读取 数据 何使用 windowsphone | 更新日期: 2023-09-27 17:59:31

一个小应用程序，我有一个蓝牙设备，它将在我们执行await _socket.OutputStream.WriteAsync(data)时发送连续数据但我无法通过windows手机连续读取数据。

private async void writeData()
{
    string newLabel = "startReading,RFID'n";
    var data = GetBufferFromByteArray(Encoding.UTF8.GetBytes(newLabel));
    await _socket.OutputStream.WriteAsync(data);
    Thread.Sleep(500);
    readData();
}
private async void readData()
{
    var buffer = new Windows.Storage.Streams.Buffer(2048);
    var receivedSize = await _socket.InputStream.ReadAsync(buffer, 2048, InputStreamOptions.ReadAhead);
    // string s = Encoding.UTF8.GetString(receivedSize,0,receivedSize.Length);
    var dr = DataReader.FromBuffer(buffer);
    List<byte> lst = new List<byte>();
    byte[] bytes = new byte[] { };
    for (int i = 0; i < 2048; i++)
    {
        //bytes[i]=dr.ReadByte();
        lst.Add(dr.ReadByte());
    }
    byte[] dataAsBytes = lst.ToArray();
    // byte[] dataAsBytes = lst.SelectMany(s => System.Text.Encoding.UTF8.GetBytes(s)).ToArray();
    string s3 = Convert.ToBase64String(dataAsBytes);
    string result = System.Text.Encoding.UTF8.GetString(dataAsBytes, 0, 2048);
    Data_txtblcx.Text = result.ToString();
}

如何使用windowsphone 8从蓝牙设备连续读取数据

让我们试着简化您的代码，看看我们是否不能让它以这种方式工作。以下是我为您准备的几个助手：

public static async Task<byte[]> ReadFromSocket(StreamSocket socket)
{
    using (var output = new MemoryStream())
    {
        var bytesCopied = await RandomAccessStream.CopyAsync(socket.InputStream, output.AsOutputStream());
        if (bytesCopied > 0)
            return output.ToArray();
    }
    return new byte[0];
}
public static IAsyncOperationWithProgress<uint,uint> WriteToSocket(StreamSocket socket, byte[] bytes)
{
    return socket.OutputStream.WriteAsync(bytes.AsBuffer());
}

要使用它们，您的示例方法看起来更像这样：

private async Task writeData(StreamSocket socket)
{
    await WriteToSocket(socket, Encoding.UTF8.GetBytes("startReading,RFID'n"));
    await Task.Delay(500);
    await readData(socket);
}
private async Task readData(StreamSocket socket)
{
    byte[] dataAsBytes = await ReadFromSocket(socket);
    Data_txtblcx.Text = Encoding.UTF8.GetString(dataAsBytes, 0, dataAsBytes.Length > 2048 ? 2048 : dataAsBytes.Length);
}

不过，如果您的问题与套接字的处理有关，这对您没有帮助。

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