从资源文件/内容获取流

时间:2012-12-13 09:05:39

标签: c# asynchronous microsoft-metro windows-runtime windows-store-apps

这是从资源文件中获取的正确/唯一方法吗?

    Uri uri = new Uri(fullPath);

    StorageFile storageFile = 
      await Windows.Storage.StorageFile.
        GetFileFromApplicationUriAsync(uri);

    IRandomAccessStreamWithContentType randomAccessStream = 
      await storageFile.OpenReadAsync();

    IInputStream resourceStream = (IInputStream)
      randomAccessStream.GetInputStreamAt(0);

我的所有其他源(http和本地存储)都返回一个Stream对象,并且使用if-else代码使用其中一个或其他代码是很痛苦的。

我也尝试过创建一个MemoryStream,但是我甚至找不到解决这些字节的方法......请帮忙。

    uint size = (uint)randomAccessStream.Size;
    IBuffer buffer = new Windows.Storage.Streams.Buffer(size);
    await randomAccessStream.ReadAsync(buffer, size, 
      InputStreamOptions.None);

    Stream stream = new MemoryStream(buffer); // error takes byte[] not IBuffer
从资源中读取时,

IInputStream.ReadAsync(): http://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.streams.iinputstream.readasync.aspx

而Stream.Read()和Stream.ReadAsync()看起来像这样:

http://msdn.microsoft.com/en-us/library/system.io.stream.read.aspx

http://msdn.microsoft.com/en-us/library/hh137813.aspx

由于

2 个答案:

答案 0 :(得分:24)

好的,我找到了它!

    StorageFile storageFile =
      await Windows.Storage.StorageFile.GetFileFromApplicationUriAsync(uri);

    var randomAccessStream = await storageFile.OpenReadAsync();
    Stream stream = randomAccessStream.AsStreamForRead();

答案 1 :(得分:7)

您也可以在少一行中完成:

Stream stream = await storageFile.OpenStreamForReadAsync();