Python:将通过toDataURL获得的PNG字符串转换为二进制PNG文件 [英] Python: Convert PNG string obtained via toDataURL to binary PNG file

问题描述

toDataURL方法(请参见例如 https://developer.mozilla .org/de/docs/Web/API/HTMLCanvasElement/toDataURL )给出了以下格式的PNG的字符串表示形式:

The toDataURL method (see e.g. https://developer.mozilla.org/de/docs/Web/API/HTMLCanvasElement/toDataURL) gives a string representation of a PNG of the following form:

   "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNby
   blAAAADElEQVQImWNgoBMAAABpAAFEI8ARAAAAAElFTkSuQmCC"

如何在python 3中将这样的PNG字符串转换为二进制PNG文件?

How can I convert such a PNG string to a binary PNG file in python 3 ?

推荐答案

好的，所以这是我犯的一个简单(也许是愚蠢的)错误.逗号之前的第一部分，即data:image/png; base64必须删除，像这样

OK, so it was a simple (and maybe stupid) mistake that I made. The first part before the comma, i.e. data:image/png;base64 must be removed, like this

import base64

with open('sample.png', 'wb') as f:
    f.write(base64.decodestring(string.split(',')[1].encode()))

对我有用.因此，您需要删除标题是一个明显的错误.但是，如果其他人也碰巧发生在我身上，我仍然会保留它作为答案.还要查看此线程 Python:Python:忽略base64解码时的错误填充"错误关于填充.

does the trick for me. So it is an obvious mistake that you need to remove the header. But I will still leave this as an answer in case it happens to others just as it happened to me. Also look at this thread Python: Ignore 'Incorrect padding' error when base64 decoding concerning padding.

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