AxWindowsMediaPlayer剪辑有时无法播放

Question

我有一个简单的单线程windows forms .NET 4.5应用程序，其中用户听口语(wav文件)，然后选择代表单词的正确图片。

问题是，剪辑有时(非常罕见-大约1%的时间，完全随机)不会播放……

这是播放剪辑的方法：

    public static void PlayWordAudio(Word word, AxWMPLib.AxWindowsMediaPlayer player)
    {
        string tempFile = Path.GetTempFileName() + ".wav";

        MemoryStream stream = new MemoryStream(word.Audio);

        using (Stream fileStream = File.OpenWrite(tempFile))
        {
            stream.WriteTo(fileStream);
        }

        player.URL = tempFile;

        File.Delete(tempFile);
    }

有没有人能建议一下这个问题的解决方案？也许我不应该删除方法末尾的文件？但之后临时文件就会堆积起来。

我使用的是Windows 7...

Answer 1

看起来我解决了这个问题。实际上是文件的删除导致了这一点...

解决方案：

public static void PlayWordAudio(Word word, AxWMPLib.AxWindowsMediaPlayer player)
    {
        string tempFile = Path.GetTempFileName() + ".wav";

        MemoryStream stream = new MemoryStream(word.Audio);

        using (Stream fileStream = File.OpenWrite(tempFile))
        {
            stream.WriteTo(fileStream);
        }

        player.URL = tempFile;

        RunDelayed(5000, File.Delete, tempFile); //if we delete file immediately then clip sometimes would not be played
    }        

    public delegate void DelayedFuncion(string param);

    public static void RunDelayed(int delay, DelayedFuncion function, string param = null)
    {
        System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();

        DelayedArgs args = new DelayedArgs() { delayedFunction = function, param = param };
        timer.Tag = args;
        timer.Tick += TimerElapsed;            
        timer.Interval = delay;

        timer.Start();
    }

    private static void TimerElapsed(object sender, EventArgs e)
    {
        System.Windows.Forms.Timer timer = sender as System.Windows.Forms.Timer;
        timer.Stop();
        DelayedArgs args = timer.Tag as DelayedArgs;
        args.delayedFunction(args.param);
    }


    class DelayedArgs
{
    public Util.DelayedFuncion delayedFunction;
    public string param;
}

Answer 2

我猜文件被删除的速度比播放的速度要快。

您可以尝试使用PlayStateChange事件来代替File.Delete(tempFile);吗

player.PlayStateChange += (snd, psce) => {
     switch (psce.newState)
    {
        case 1:    // Stopped (maybe use 12 =>  Last )
            File.Delete(tempFile);
            break;
        default:
            Debug.WriteLine(psce.newState);
            break;
    }
};

如果长时间保留player对象，则可能需要取消订阅事件。