[UWP]如何在代码中将图像或位图图像保存到storagefile - 没有filepicker或URI

问题描述

您好，

我正在开发一个应用程序，我将图像编码为base64string作为JSON对象的一部分。我能够解码它并将其作为图像对象。我需要能够将此图像保存到代码中的存储文件中。

我看过他们使用文件选择器的示例，我看过他们使用URI的示例图片。在我的情况下，我没有图像的URI，我需要指定文件而不使用filepicker。

我可以从存储文件中加载图像 像这样：

public static async Task< Image> LoadBitmapFromStorageFile（字符串aFileName）

  &NBSP; &NBSP; &NBSP; {

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; StorageFile ImageFile = await Globals.picturesLibrary.GetFileAsync（aFileName）;



  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; BitmapImage bimg = new BitmapImage（）;  &NBSP; &NBSP; &NBSP; &NBSP;   

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; FileRandomAccessStream stream =（FileRandomAccessStream）await ImageFile.OpenAsync（FileAccessMode.Read）;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; bimg.SetSource（stream）;



  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; Image img = new Image（）;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; img.Source = bimg;



  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;返回img;

  &NBSP; &NBSP; &NBSP; }

但我该怎么做呢？

谢谢，

Yanky

  

解决方案

Hello,

I am developing an app where I am getting images encoded to base64string over as part of a JSON object. I am able to decode this and get it as an image object. I need to be able to save this image to a Storagefile in the code.

I have seen examples where they are using a filepicker, and I have seen examples where they are using the URI of the image. In my case I do not have a URI for the image, and I need to specify the file and not use the filepicker.

I can load an image from a storagefile  like this:

public static async Task<Image> LoadBitmapFromStorageFile(string aFileName)
        {
            StorageFile ImageFile = await Globals.picturesLibrary.GetFileAsync(aFileName);

            BitmapImage bimg = new BitmapImage();            
            FileRandomAccessStream stream = (FileRandomAccessStream)await ImageFile.OpenAsync(FileAccessMode.Read);
            bimg.SetSource(stream);

            Image img = new Image();
            img.Source = bimg;

            return img;
        }

but how would I do the reverse?

Thanks,

Yanky

  

解决方案

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