从 base64String 加载 bitmapImage

本文介绍了从 base64String 加载 bitmapImage的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

如何在 windows 8 中从 base64String 加载 bitmapImage?

How can I load a bitmapImage from base64String in windows 8?

我试过这个，但我没有成功.它曾经在windows phone上工作.有什么不同?

I tried this but I am not successful. It used to work on windows phone. What is different?

看来我必须使用函数 setsourceasync.当我使用它时，我需要将参数作为 IRandomMemory 传递，这是我无法做到的.如何做到这一点?

Looks like I have to use the function setsourceasync. When I use that, then I am required to pass the parameter as IRandomMemory which I am unable to do. How to do this?

public static BitmapImage Base64ToImage(string base64String) { var bitmapImage = new BitmapImage(); try { if (!String.IsNullOrEmpty(base64String)) { var imageBytes = Convert.FromBase64String(base64String); using (var ms = new MemoryStream(imageBytes, 0, imageBytes.Length)) { bitmapImage.SetSourcec(ms); return bitmapImage; } } } catch (Exception e) { } return null; }

推荐答案

要为 SetSource 方法创建 IRandomAccessStream 对象，您需要使用 DataWriter.看看这段代码:

To create an IRandomAccessStream object for the SetSource method, you need to use a DataWriter. Take a look to this code:

public async Task<BitmapImage> GetImage(string value) { if (value == null) return null; var buffer = System.Convert.FromBase64String(value); using (InMemoryRandomAccessStream ms = new InMemoryRandomAccessStream()) { using (DataWriter writer = new DataWriter(ms.GetOutputStreamAt(0))) { writer.WriteBytes(buffer); await writer.StoreAsync(); } var image = new BitmapImage(); image.SetSource(ms); return image; } }