图像作为字节流流

Question

I am taking pictures with my camera and when OnPictureTaken is called i get a byte[ ] data. I am trying to convert the byte array to a System.IO.Stream. This helps me to analise the image in the Project Oxford API. I've tried in countless ways to do this but it seems I can't find a solution. I would be very grateful if you help me.

Answer 1

您可以使用MemoryStream类，该类创建由字节数组支持的流： MSDN链接

Answer 2

When using the Client SDK , wich you can get via NuGet , you need to provide a Stream to methods like VisionServiceClient.AnalyzeImageAsync() .

You can create a Stream out of an byte[] and provide it to the SDK like this:

using (var stream = new MemoryStream(yourByteArray))
{
    var visionServiceClient = new VisionServiceClient("YOUR_API_KEY");
    var visualFeatures = new VisualFeature[] { VisualFeature.Adult, VisualFeature.Categories, VisualFeature.Color, VisualFeature.Description, VisualFeature.Faces, VisualFeature.ImageType, VisualFeature.Tags };

    var result = await visionServiceClient.AnalyzeImageAsync(stream, visualFeatures);
}

Hint: In Android you often end up with a Android.Graphics.Bitmap object when working with images. Especially when taking pictures with the camera. You can also convert them to streams with imageBitmap.Compress(Bitmap.CompressFormat.Jpeg, 0, stream); but don't forget to "rewind" the stream with stream.Seek(0, SeekOrigin.Begin); , otherwise the SDK will throw an exception.