将.mp4保存到Windows Phone视频库

Question

我想知道如何从URI下载MP4视频文件并将其保存到Windows Phone 8.1上的媒体库中。 如果它在通用应用程序中工作会很好 - 但它不一定。

我发现这段代码将图像保存到相机胶卷上 - 我是否用同样的方式将它保存到视频库中？* .mp4？我是否可以将一个下载流（不确定这是否合理）传递给该功能？

StorageFolder testFolder = await StorageFolder.GetFolderFromPathAsync(@"C:\test"); 
StorageFile sourceFile = await testFolder.GetFileAsync("TestImage.jpg"); 
StorageFile destinationFile = await KnownFolders.CameraRoll.CreateFileAsync("MyTestImage.jpg"); 

using (var sourceStream = await sourceFile.OpenReadAsync()) 
{ 
    using (var sourceInputStream = sourceStream.GetInputStreamAt(0)) 
    { 
     using (var destinationStream = await destinationFile.OpenAsync(FileAccessMode.ReadWrite)) 
     { 
      using (var destinationOutputStream = destinationStream.GetOutputStreamAt(0)) 
      { 
       await RandomAccessStream.CopyAndCloseAsync(sourceInputStream, destinationStream); 
      } 
     } 
    } 
} 

Answer 1

所以，我终于想通了，这是我的代码如下所示：

var httpClient = new HttpClient(); 
var response = await httpClient.GetAsync(url); 

if (response.IsSuccessStatusCode) 
{ 
    var file = await response.Content.ReadAsByteArrayAsync(); 
    StorageFile destinationFile 
     = await KnownFolders.SavedPictures.CreateFileAsync("file.mp4", 
      CreationCollisionOption.ReplaceExisting); 

    Windows.Storage.Streams.IRandomAccessStream stream = await destinationFile.OpenAsync(FileAccessMode.ReadWrite); 
    IOutputStream output = stream.GetOutputStreamAt(0); 

    DataWriter writer = new DataWriter(output); 
    writer.WriteBytes(file); 
    await writer.StoreAsync(); 
    await output.FlushAsync(); 
}