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。 如果它可以在通用应用程序中工作，那就太好了 - 但不是必须的。

我发现此代码可将图像保存到相机胶卷 - 我是否使用 *.mp4 以相同的方式将其保存到视频库？我可以将下载流（不确定这是否有意义）交给该功能吗？

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，这就是我的代码的样子：

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();
}