使用R连接到Twitter Streaming API [英] Connect to the Twitter Streaming API using R

问题描述

我刚刚开始使用Twitter Streaming API，并使用命令行，使用以下命令将原始JSON响应重定向到一个文件：

  curl https://stream.twitter.com/1/statuses/sample.json -u USER：PASSWORD -osomefile.txt
  

是否可以完全停留在R中并利用RCurl做同样的事情？而不是只是将输出保存到文件，我想解析返回的每个响应。我已经解析过twitter搜索结果，但我想这样做，因为每个响应都收到。基本上，对每个JSON响应应用一个函数。

提前感谢。

我试过在R（我在Windows上，不幸的是）。我需要包括对.pem文件的引用，以避免错误。但是，代码只是运行，我似乎不能看到返回的东西。我已尝试过打印，cat等。

  download.file（url =http://curl.haxx.se/ ca / cacert.pem，destfile =cacert.pem）
 getURL（https://stream.twitter.com/1/statuses/sample.json，
 userpwd =USER： PWD，
 cainfo =cacert.pem）
  

解决方案>

我能够找出基本信息，希望这有助于。

 ＃====== ================================================== ==================== 
＃使用RCURL串流微博
＃================ ================================================== ============ 
库（RCurl）
库（rjson）
 
＃设置目录
 setwd（C： \\\）
 
 ####将输出重定向到文件
 WRITE_TO_FILE<  -  function（x）{
 
 if（nchar（x）> ; 0）{
 write.table（x，file =Twitter Stream Capture.txt，append = T，row.names = F，col.names = F）
} 
 
} 
 
 ### Windows用户需要获取此证书来验证
 download.file（url =http://curl.haxx.se/ca/cacert。 pos，destfile =cacert.pem）
 
 ###将原始JSON数据从Twitter Firehouse写入文本文件
 getURL（https：//stream.twitter。 com / 1 / statuses / sample.json，
 userpwd = USER：PASSWORD，
 cainfo =cacert.pem，
 write = WRITE_TO_FILE）
  

I just started playing around with the Twitter Streaming API and using the command line, redirect the raw JSON reponses to a file using the command below:

curl https://stream.twitter.com/1/statuses/sample.json -u USER:PASSWORD -o "somefile.txt"

Is it possible to stay completely within R and leverage RCurl to do the same thing? Instead of just saving the output to a file, I would like to parse each response that is returned. I have parsed twitter search results in the past, but I would like to do this as each response is received. Essentially, apply a function to each JSON response.

Thanks in advance.

EDIT: Here is the code that I have tried in R (I am on Windows, unfortunately). I need to include the reference to the .pem file to avoid the error. However, the code just "runs" and I can not seem to see what is returned. I have tried print, cat, etc.

download.file(url="http://curl.haxx.se/ca/cacert.pem", destfile="cacert.pem")
getURL("https://stream.twitter.com/1/statuses/sample.json", 
       userpwd="USER:PWD",
       cainfo = "cacert.pem")

解决方案

I was able to figure out the basics, hopefully this helps.

#==============================================================================
# Streaming twitter using RCURL
#==============================================================================
library(RCurl)
library(rjson)

# set the directory
setwd("C:\\")

#### redirects output to a file
WRITE_TO_FILE <- function(x) {

     if (nchar(x) >0 ) {
          write.table(x, file="Twitter Stream Capture.txt", append=T, row.names=F, col.names=F)
     }

}

### windows users will need to get this certificate to authenticate
download.file(url="http://curl.haxx.se/ca/cacert.pem", destfile="cacert.pem")

### write the raw JSON data from the Twitter Firehouse to a text file
getURL("https://stream.twitter.com/1/statuses/sample.json", 
       userpwd=USER:PASSWORD,
       cainfo = "cacert.pem", 
       write=WRITE_TO_FILE)

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