将流保存到c#和winrt中的文件中

Question

我在c#和winrt:

var stream = await speech.GetSpeakStreamAsync(SpeechText.Text, language);

stream 是一个 Windows.Storage.Streams.IRandomAccessStream

所以我对c#和winrt完全不熟悉.我如何将包含wav文件的流保存到文件中？在此先感谢Basilius

Answer 1

IRandomAccessStream有一个名为GetInputStreamAt的方法http://msdn.microsoft.com/en-US/library/windows/apps/windows.storage.streams.irandomaccessstream

IInputStream inputStream = stream.GetInputStreamAt(0);

这会让你获得一个IInputStream.

IInputStream接口只定义一个方法ReadAsync,它允许您将字节读入IBuffer对象.Windows.Storage.Stream还包括一个基于IInputStream对象创建的DataReader类,然后从流中读取大量.NET对象以及字节数组.http://www.charlespetzold.com/blog/2011/11/080203.html,http://msdn.microsoft.com/library/windows/apps/BR208119

using (var stream = new InMemoryRandomAccessStream())
{
    // for example, render pdf page
    var pdfPage = document.GetPage((uint)i);
    await pdfPage.RenderToStreamAsync(stream);

    // then, write page to file
    using (var reader = new DataReader(stream))
    {
        await reader.LoadAsync((uint)stream.Size);
        var buffer = new byte[(int)stream.Size];
        reader.ReadBytes(buffer);
        await Windows.Storage.FileIO.WriteBytesAsync(file, buffer);
    }
}

现在你有一个包含所有读取字节的缓冲区.

您现在可以将此缓冲区保存到文件http://blog.jerrynixon.com/2012/06/windows-8-how-to-read-files-in-winrt.html

var file = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFileAsync("MyWav.wav", Windows.Storage.CreationCollisionOption.ReplaceExisting);
await Windows.Storage.FileIO.WriteBytesAsync(file, buffer);