Downloading image from internet into local folder and using it as a texture2d.

Windows UWP
1

I have been unable to download an image from the internet into the local folder and succeed in using it as a texture2d.

I have been able to download the image just fine. I have not found the combination of streams or magic to make the image stored inside a texture2d variable.

Content.Load is expecting me to come from the standard content folder, except I’m stuck in the ApplicationData local folder.

Could anyone help?

2

Texture2D.FromStream ?
http://msdn.microsoft.com/en-us/library/ff434103.aspx

Support will depend on what platform you are on, but it should work on most

3

With what stream?

        Stream stream3 = TitleContainer.OpenStream("Content/01d.png");

        Texture2D testing = Texture2D.FromStream(GraphicsDevice, stream3);

The TitleContainer is still behaving with relative pathing. Any streams that can access the ApplicationData?

4

You can use any type of stream. It doesn’t have to come from TitleContainer or the ContentManager. What did you use to write the file to disk?

5 
            HttpClient httpClient = new HttpClient();
            HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, source);
            response = await httpClient.SendAsync(request,
                HttpCompletionOption.ResponseHeadersRead);
            
            imgfile = await ApplicationData.Current.LocalFolder.CreateFileAsync("test.png", CreationCollisionOption.FailIfExists);
            var fs = await imgfile.OpenAsync(FileAccessMode.ReadWrite);
            DataWriter writer = new DataWriter(fs.GetOutputStreamAt(0));
            writer.WriteBytes(await response.Content.ReadAsByteArrayAsync());
            await writer.StoreAsync();
            writer.DetachStream();
            await fs.FlushAsync();

Some way to reverse this to be a reader?

6

There are extension methods to convert between WinRT streams and .NET streams.

1 Like
7 
        StorageFile imgfile = await ApplicationData.Current.LocalFolder.CreateFileAsync("bubbles.png", CreationCollisionOption.OpenIfExists);

        var fs = await imgfile.OpenAsync(FileAccessMode.Read);

        test = Texture2D.FromStream(GraphicsDevice, fs.AsStream());

This code, so beautiful and elegant. Thank you good sir for pointing out the AsStream function to me.