Stackoverflow上的问题
is not new,但我很确定我错过了一些明显的东西.
我正在尝试将一些.pdf文件转换为.txt文件,以便挖掘它们的文本.我的方法基于这个excellent script.pdf文件中的文本不是由图像组成的,因此不需要OCR.
# Load tm package
library(tm)
# The folder containing my PDFs
dest <- "./pdfs"
# Correctly installed xpdf from http://www.foolabs.com/xpdf/download.html
file.exists(Sys.which(c("pdfinfo", "pdftotext")))
[1] TRUE TRUE
# Delete white spaces from pdfs' names
sapply(myfiles, FUN = function(i){
file.rename(from = i, to = paste0(dirname(i), "/", gsub(" ", "", basename(i))))
})
# make a vector of PDF file names
myfiles <- list.files(path = dest, pattern = "pdf", full.names = TRUE)
lapply(myfiles, function(i) system(paste('"C:/Program Files/xpdf/bin64/pdftotext.exe"',
paste0('"', i, '"')), wait = FALSE))
它应该在dest文件夹中创建任何.pdf文件的.txt副本.我检查了路径white spaces path的问题,但是没有任何反应.
这是我正在研发的repository.如果它有用,我可以粘贴SessionInfo.提前致谢.
最佳答案 迟到的答案:
但是我最近发现,如果你安装了pdftools(install.packages(“pdftools”)),你可以使用当前版本的tm(0.7-4)将pdfs直接读入语料库.
library(tm)
directory <- getwd() # change this to directory where pdf-files are located
# read the pdfs with readPDF, default engine used is pdftools see ?readPDF for more info
my_corpus <- VCorpus(DirSource(directory, pattern = ".pdf"),
readerControl = list(reader = readPDF))