从 base64String 加载 bitmapImage [英] Load bitmapImage from base64String

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;
        }
    }

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