javascript 转换缓冲区 base64 -> utf8 编码 node.js
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Convert buffer base64 -> utf8 encoding node.js
提问by Aerodynamika
My app imports all the messages from the Notes folder of GMail. I use imap npm module for that.
我的应用程序从 GMail 的 Notes 文件夹中导入所有邮件。我为此使用 imap npm 模块。
Using the example from their github page I get all the contents of a message into a buffer:
使用他们 github 页面中的示例，我将消息的所有内容放入缓冲区：
stream.on('data', function(chunk) {
count += chunk.length;
buffer += chunk.toString('utf8');
});
However, what I get are sentences like
然而，我得到的是这样的句子
0KHQvdCw0YfQsNC70LAg0YHQvtC30LTQsNC10YLRgdGPINGA0LXRiNC10YLQutCwINC/0YDQvtGB 0YLRgNCw0L3RgdGC0LLQsCDQstC+0L7QsdGA0LDQttC10L3QuNGPLiZuYnNwOzxkaXY+PGJyPjwv ZGl2PjxkaXY+0JfQsNGC0LXQvCDQvdCwI
(wrong conversion from Russian)
（俄语转换错误）
I found out that these are the snippets of text encoded in base64 and in order to read them I need to convert it from base64 to utf8.
我发现这些是用 base64 编码的文本片段，为了阅读它们，我需要将其从 base64 转换为 utf8。
There is also sometimes an annoying = character that appears from nowhere...
有时也有一个烦人的 = 字符不知从哪里出现...
letting them f= all on her shoulders
Do you know how I could get rid of those two problems?
你知道我怎样才能摆脱这两个问题吗？
Thank you!
谢谢！
回答by mido
new Buffer(...)has been deprecated for a while now, go for Buffer.from(...)
new Buffer(...)已经弃用一段时间了，继续 Buffer.from(...)
a simple example might be:
一个简单的例子可能是：
var utf8encoded = Buffer.from(base64encoded, 'base64').toString('utf8');
回答by jabclab
In order to convert from a base64 encoded Stringto utf8 you can use the following:
为了从 base64 编码转换String为 utf8，您可以使用以下命令：
var base64encoded = '0KHQvdCw0YfQsNC70LAg0YHQvtC30LTQsNC10YLRgdGPINGA0LXRiNC10YLQutCwINC/0YDQvtGB 0YLRgNCw0L3RgdGC0LLQsCDQstC+0L7QsdGA0LDQttC10L3QuNGPLiZuYnNwOzxkaXY+PGJyPjwv ZGl2PjxkaXY+0JfQsNGC0LXQvCDQvdCwI';
var utf8encoded = (new Buffer(base64encoded, 'base64')).toString('utf8');
