将base64字符串转换为文件 [英] Convert base64 string to file

问题描述

我正在尝试将base64字符串转换回原始文件.我尝试从中导出这些文件的应用程序仅允许我导出base64字符串.导出将返回base64字符串和文件类型.

I'm trying to convert base64 strings back to the original files. The application from where I try to export these files will only allow me to export in base64 strings. This export returns the base64 string and the filetype.

如何将这些字符串转换回原始文件?我一直在尝试这样的事情，但是我认为这不适用于不同类型的文件吗?

How can I convert these strings back to the original files? I've been trying things like this, but I don't think this will work with different types of files?

[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($file)) |
    Out-File C:\ID\document.$($extension)

任何人都可以向我提供一些有关如何执行此操作的想法吗?

Can anyone provide me some ideas on how to do this?

推荐答案

FromBase64String()方法将base64编码的字符串转换为字节数组.您需要做的就是将该字节数组写回到文件中

The FromBase64String() method converts a base64-encoded string to a byte array. All you need to do is write that byte array back to a file:

$b64      = 'AAAAAA...'
$filename = 'C:\path\to\file'

$bytes = [Convert]::FromBase64String($b64)
[IO.File]::WriteAllBytes($filename, $bytes)

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