在Ruby中打开并保存base64编码的图像数据URI [英] Open and save base64 encoded image data URI in Ruby

问题描述

从我看过的几篇文章中，我正在尝试

From several posts I've seen, I am trying this

x = Base64.decode64("data:image/png;base64,iVBOR....")
File.open('test.png','wb') {|file| file.write x}

但是我不能用查看器打开图像，我还需要做更多的事情吗?

But then I can't open the image with a viewer, do I have to do something more?

推荐答案

您的问题是您试图将'data:image/png;base64,'前缀解码为Base64数据；该前缀是完全有效的Base64数据，但不是PNG文件的Base64表示形式.结果是您的test.png文件包含一堆废话，后面跟着一些实际上是PNG文件的位.在解码PNG之前先剥离数据URL前缀:

Your problem is that you're trying to decode the 'data:image/png;base64,' prefix as Base64 data; that prefix is perfectly valid Base64 data but it is not the Base64 representation of a PNG file. The result is that your test.png file contains a bunch of nonsense followed by some bits that actually are a PNG file. Strip off the data URL prefix before decoding the PNG:

data_url = "data:image/png;base64,iVBOR...."
png      = Base64.decode64(data_url['data:image/png;base64,'.length .. -1])
File.open('test.png', 'wb') { |f| f.write(png) }

这篇关于在Ruby中打开并保存base64编码的图像数据URI的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！