链接：http://ws.stream.qqmusic.qq.com/C100003HIv074OhPZt.m4a?fromtag=0&guid=126548448
代码：
string v = "http://ws.stream.qqmusic.qq.com/C100003HIv074OhPZt.m4a?fromtag=0&guid=126548448"
var coverpic_file = await KnownFolders.MusicLibrary.CreateFileAsync("smg.m4a", CreationCollisionOption.FailIfExists);
var httpWebRequest = HttpWebRequest.CreateHttp(v);
HttpWebResponse response = (HttpWebResponse)await httpWebRequest.GetResponseAsync();
Stream resStream = response.GetResponseStream();
using (var stream = await coverpic_file.OpenAsync(FileAccessMode.ReadWrite))
{
await resStream.CopyToAsync(stream.AsStreamForWrite());
}
response.Dispose();
我发现用这个链接打开的网址不会直接发送音频文件啊，所以生成的文件是无效的。如图：
有没有大佬知道该怎么来获取这个文件吗？

Uri source = new Uri(v);
var file = await KnownFolders.MusicLibrary.CreateFileAsync("smg.m4a", CreationCollisionOption.FailIfExists);
BackgroundDownloader downloader = new BackgroundDownloader();
DownloadOperation download = downloader.CreateDownload(source, file);
await download.StartAsync();
好吧，我找到解决方法了

你是要搞企鹅音乐的第三方播放器么