使用Powershell解码base64 [英] Decoding base64 with powershell

问题描述

我正在尝试从base64解码电子邮件文件中的附件并将其保存到磁盘.

I'm attempting to decode an attachment in an email file from base64 and save it to disk.

出于测试目的，这是我的代码.其中input.txt仅包含base64编码的数据，它是一个HTML文件.

For testing purposes, this is my code. Where input.txt contains just the base64 encoded data, which is an HTML file.

$file = "C:\input.txt"
$data = Get-Content $file
[System.Text.Encoding]::ASCII.GetString([System.Convert]::FromBase64String($data)) > out.html

解码正常，它会生成一个包含所有行的新文件，并且与原始附件明显相同.问题在于输出文件的大小是该文件大小的两倍(在这种情况下，实际上是(filesize * 2)+6个字节).

The decoding works fine, and it generates a new file that contains all of the lines, and is visibly identical to the original attachment. The problem is that the output file is twice the size (actually (filesize*2)+6 bytes, in this case).

我解码不正确吗?我还尝试了UTF8而不是ASCII ...相同的结果.

Am I decoding this improperly? I've also tried UTF8 instead of ASCII... same result.

推荐答案

好了，我可以使用它了.谁知道默认情况下Out-File被重新编码为Unicode?通过执行以下操作来解决:

Well I got it working. Who knew Out-File re-encoded to Unicode by default? Solved by doing the following:

$file = "C:\input.txt"
$data = Get-Content $file
[System.Text.Encoding]::ASCII.GetString([System.Convert]::FromBase64String($data)) | Out-File -Encoding "ASCII" out.html

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