在R中将Base64转换为PNG/JPEG文件 [英] Convert Base64 to PNG/JPEG file in R

问题描述

我在下面的帖子中看到了将png文件转换为base64的过程 将R图像转换为Base 64

我想做的和你做的完全相反.我将图像的base64存储在变量"capimg"中，现在我想将其转换为png或jpeg文件.您能帮我对流程进行逆向工程吗?

这可行吗?

我已经看到使用php来完成此操作，如下所示，但我需要一个R脚本来完成该操作

<?php
$data = urldecode($_POST['imageData']);
list($type, $data) = explode(';', $data);
list(, $data)      = explode(',', $data);
$data = base64_decode($data);
file_put_contents('image.png', $data);
?>

实际上，我还可以使用base64enc包将base64解码为向量，如下所示 y<-base64decode(capimg)

但是我不知道该怎么做

解决方案

这对我有用:

library(base64enc)

enc <- base64encode("images.jpg")
conn <- file("w.bin","wb")
writeBin(enc, conn)
close(conn)

inconn <- file("w.bin","rb")
outconn <- file("img2.jpg","wb")
base64decode(what=inconn, output=outconn)
close(inconn)
close(outconn)

images.jpg由Wikipedia提供，该维基百科可从

I have seen the process to convert a png file to base64 work in the post below Convert R image to Base 64

I would like to do the exact opposite of what you did. I have a base64 of a image stored in a variable "capimg" and now I want to convert it into a png or jpeg file. Can you help me reverse engineer the process.

Is this doable?

I have seen this done using php like below but I need a R script to do the same

<?php
$data = urldecode($_POST['imageData']);
list($type, $data) = explode(';', $data);
list(, $data)      = explode(',', $data);
$data = base64_decode($data);
file_put_contents('image.png', $data);
?>

In fact I am also able to decode the base64 into a vector using the base64enc package like below y <- base64decode(capimg)

But I do not know how to proceed any further

解决方案

this works for me:

library(base64enc)

enc <- base64encode("images.jpg")
conn <- file("w.bin","wb")
writeBin(enc, conn)
close(conn)

inconn <- file("w.bin","rb")
outconn <- file("img2.jpg","wb")
base64decode(what=inconn, output=outconn)
close(inconn)
close(outconn)

images.jpg courtesy of Wikipedia accessed from here

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