R从URL下载图片 [英] R Downloading Pictures from URL

问题描述

我从R的网站下载图片时遇到问题。
似乎图像已被 download.file 正确识别：

尝试URL' http://i.imgur.com/pszAeGh.png '
内容类型'image / png'长度16592字节（16 Kb）
打开的URL
下载的16 Kb

并且还会以正确的名称和以（.png）结尾的文件下载到正确的目录。

  download.file（ http://i.imgur.com/pszAeGh.png，粘贴（**您的EST * *， Stackoverflow，。png，sep =）））
  

但是，文件被屠杀，无法打开。

我在这里做什么错了？

解决方案

我无法找不到重复的内容，所以我就回答。这样，但如果仔细阅读，就会发现在Windows上，默认的 mode = w 仅适用于文本文件。对于二进制文件（除文本外几乎所有内容），您需要 mode = wb 。如果网址以 gz，.bz2，.xz，.tgz，.zip，.rda 或 .RData ，但是对于其他任何事情，您需要自己指定 mode = wb 。

I have a problem downloading pictures from websites with R. It seems like the image is properly recognized by download.file:

trying URL 'http://i.imgur.com/pszAeGh.png' Content type 'image/png' length 16592 bytes (16 Kb) opened URL downloaded 16 Kb

And it also is downloaded with the right name and file ending (.png) to the right directory.

download.file("http://i.imgur.com/pszAeGh.png",paste(**yourDEST**,"Stackoverflow",".png",sep=""))

however, the file is butchered and can't be opened.

What am I doing wrong here?

解决方案

I couldn't find a duplicate, so I'll just answer.

The download.file help is a bit fragmented on this, but if you read it all carefully you can find that, on Windows, the default mode = "w" is only suitable for text files. For binary files (pretty much everything but text) you need mode = "wb". This will be done automagically if the URL ends in any of gz, .bz2, .xz, .tgz, .zip, .rda or .RData, however for anything else you need to specify mode = "wb" yourself.

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