【发布时间】：2017-04-04 21:36:05
【问题描述】：
我在将 RandomAccessStream 转换为浮点数组时遇到问题。浮点数组包含 NaN 值。我不知道它们是来自流、字节数组还是浮点数组。性能和质量在这方面很重要，如果有更好的方法，请告诉我。
最后数我得到了 122 个 NaN。
谢谢
private async void button_Click(object sender, RoutedEventArgs e)
{
string text = "this is text";
SpeechSynthesizer synthesizer = new SpeechSynthesizer();
SpeechSynthesisStream synthesisStream = await synthesizer.SynthesizeTextToStreamAsync(text);
Stopwatch watch = new Stopwatch();
watch.Start();
ProcessStream(synthesisStream.CloneStream());
watch.Stop();
// Performance is important
Debug.WriteLine(watch.Elapsed);
}
private async void ProcessStream(IRandomAccessStream stream)
{
// Create a buffer (somewhere to put the stream)
byte[] bytes = new byte[stream.Size];
// Add stream data to buffer (Following or After that) same result
// IBuffer x = await stream.ReadAsync(bytes.AsBuffer(), (uint)stream.Size, InputStreamOptions.None);
using (DataReader reader = new DataReader(stream))
{
await reader.LoadAsync((uint)stream.Size);
reader.ReadBytes(bytes);
}
// Change buffer(in bytes) to a float array
float[] floatArray = MainPage.ConvertByteToFloat(bytes.ToArray());
int nanCount = 0;
for (var index = 0; index < floatArray.Length; index++)
{
float value = floatArray[index];
if (float.IsNaN(value))
{
nanCount++;
}
}
Debug.WriteLine("Nan count: " + nanCount);
}
public static float[] ConvertByteToFloat(byte[] array)
{
float[] floatArr = new float[array.Length / 4];
for (int i = 0; i < floatArr.Length; i++)
{
if (BitConverter.IsLittleEndian)
{
Array.Reverse(array, i * 4, 4);
}
floatArr[i] = BitConverter.ToSingle(array, i * 4);
}
return floatArr;
}
【问题讨论】：
-
尝试
private async Task ProcessStream(...)并在点击处理程序中等待它await ProcessStream(synthesisStream);我只是想知道CloneStream()在发送到fire-&-forget 方法时会出现问题。