R中下载文件出错

Question

我有一个 excel 文件，其中包含公司名称及其 .pdf 文件的可下载链接。我的目标是根据 excel 列中的公司名称创建目录，并将 pdf 文件下载到新创建的目录。

这是我的代码

##Set the working directory
txtsrc<-"C:\FirstAid"
        setwd(txtsrc)

##make a vector  file names and links
 pdflist <- read.xlsx("Final results_6thjuly.xlsx",1)
colnames(pdflist)

##Check if docs folder exists
if (dir.exists("FirstAid_docs")=="FALSE"){
dir.create("FirstAid_docs")
}

##Change the working directory
newfolder<-c("FirstAid_docs")
newpath<-file.path(txtsrc,newfolder)
setwd(newpath)

##Check the present working directory
getwd()

    ## Create directories and download files
    for( i in 1:length(pdflist[,c("ci_CompanyName")])){

    ##First delete the existing directories
    if(dir.exists(pdflist[,c("ci_CompanyName")][i])=="TRUE"){
        unlink(pdflist[,c("ci_CompanyName")][i], recursive = TRUE)
      }

    ##Create a new directory
    directoryname<-pdflist[,c("ci_CompanyName")][i]
    dir.create(directoryname,recursive = FALSE, mode = "0777")


      ##Get the downloadable links
      ##Link like :www.xyz.com thus need to add https to it
      link<-pdflist[,c("DocLink")][i]
      vallink<-c("https://")

       ##Need to remove quotes from link
      newlink<-paste0(vallink,link)
      newlink<-noquote(newlink)

      ##Set paths for the downloadble file
      destfile<-file.path(txtsrc,newfolder,directoryname)


      ##Download the file
      download.file(newlink,destfile,method="auto")

      ##Next record
          i<-i+1
    }

这是我得到的error/results

 > colnames(pdflist)
[1] "ci_CompanyID"   "ci_CompanyName" "ProgramScore"   "ID_DI"          "DocLink"       
> download.file(newlink,destfile,method="auto")
Error in download.file(newlink, destfile, method = "auto") : 
  cannot open destfile 'C:\Users\skrishnan\Desktop\HR needed\text analysis proj\pdf\FirstAid/FirstAid_docs/Buckeye Partners, LP', reason 'Permission denied'

尽管设置了 chmod 为什么我还是收到错误。我在 Windows 64 位机器上使用 CRAN RGui（64 位）和 R 版本 3.5.0。非常感谢任何帮助。

Answer 1

destfile in download.file 需要是一个特定的文件，而不仅仅是一个目录。例如，

'C:\Users\skrishnan\Desktop\HR needed\text analysis proj\pdf\FirstAid\FirstAid_docs\Buckeye Partners, LP\myFile.pdf'

Answer 2

最终工作代码：

> ##Set the working directory txtsrc<-"C:\FirstAid"
>         setwd(txtsrc)
> 
> ##make a vector  file names and links  pdflist <- read.xlsx("Final results_6thjuly.xlsx",1) colnames(pdflist)
> 
> ##Check if docs folder exists if (dir.exists("FirstAid_docs")=="FALSE"){ dir.create("FirstAid_docs") }
> 
> ##Change the working directory newfolder<-c("FirstAid_docs") newpath<-file.path(txtsrc,newfolder) setwd(newpath)
> 
> ##Check the present working directory getwd()
> 
>     ## Create directories and download files
>     for( i in 1:length(pdflist[,c("ci_CompanyName")])){
> 
>     ##First delete the existing directories
>     if(dir.exists(pdflist[,c("ci_CompanyName")][i])=="TRUE"){
>         unlink(pdflist[,c("ci_CompanyName")][i], recursive = TRUE)
>       }
> 
>     ##Create a new directory
>     directoryname<-pdflist[,c("ci_CompanyName")][i]
>     dir.create(directoryname,recursive = FALSE, mode = "0777")
> 
> 
>       ##Get the downloadable links
>       ##Link like :www.xyz.com thus need to add https to it
>       link<-pdflist[,c("DocLink")][i]
>       vallink<-c("https://")
> 
>        ##Need to remove quotes from link
>       newlink<-paste0(vallink,link)
>       newlink<-noquote(newlink)
> 
>       ##Set paths for the downloadble file
>       neway<-file.path(newpath,directoryname) 
>       destfile<-paste(neway,"my.pdf",sep="/")
> 
>     
>      
>       ##Download the file
>       download.file(newlink,destfile,method="auto")
> 
>       ##Next record
>           i<-i+1
>     }

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