13

Web データをスクレイピングしようとしていますが、最初のステップでログインが必要です。他の Web サイトには正常にログインできましたが、この Web サイトで奇妙なエラーが発生しました。

library("rvest")
library("magrittr")    

research <- html_session("https://www.fitchratings.com/")

signin <- research %>%
  html_nodes("form") %>%
  extract2(1) %>%
  html_form() %>%
  set_values (
    'userName' = "abc",
    'password' = "1234"
     )

research <- research %>%
  submit_form(signin)

「submit_form」行を実行すると、次のエラーが表示されます。

> research <- research %>%
+ submit_form(signin)
Submitting with '<unnamed>'
Error: length(url) == 1 is not TRUE

unnamed での送信は正しいです。b/c サインイン ボタンに名前が割り当てられていません。どんな助けでも大歓迎です！

4

1 に答える 1

9

I was having the same issue. I jumped through a few hoops to get the dev version of rvest running, and it's working smoothly now. Here's how I went about it:

First thing first. You need to install RTools. Make sure R is closed out. This can be found here: https://cran.r-project.org/bin/windows/Rtools/. And information for the installation of Rtools can be found here (if you're using Windows): github.com/stan-dev/rstan/wiki/Install-Rtools-for-Windows

Boot up R, then install libraries "httr" and "Rcpp" if you don't have them already.

Install "devtools" and the correlated github installer. Information can be found here, but I'll give you a quick summary from the linked repo.

Windows:

install.packages("devtools")
library(devtools)
build_github_devtools()

#### Restart R before continuing ####
install.packages("devtools.zip", repos = NULL, type = "source")

# Remove the package after installation
unlink("devtools.zip")

Mac/Linux:

devtools::install_github("hadley/devtools")

Now, to run the final steps.

library(httr)
library(Rcpp)
library(devtools)
install_github("hadley/rvest")

You should now be able to run submit_form(session, form) and not experience the error 

Submitting with 'xxxx'
Error: length(url) == 1 is not TRUE
于 2015-09-15T21:39:56.637 に答える