如何將類的對象「HTMLInternalDocument」「XMLInternalDocument」轉換爲類「字符」的對象？ （scrapeR包）

Question

如何將類的對象「HTMLInternalDocument」「XMLInternalDocument」直接轉換爲類「字符」的對象？ （刮包）

Answer 1

您可以將其轉儲到一個文件中，並使用您最喜歡的方法閱讀相關部分。

library(scrapeR) 
f = system.file("exampleData", "mtcars.xml", package="XML") 
doc = xmlTreeParse(f, useInternalNodes = TRUE) 
sink("your.file.txt") 
doc 
sink() 

閱讀，例如

readLines("your.file.txt") 

[1] "<?xml version=\"1.0\"?>"                   
[2] "<!DOCTYPE dataset SYSTEM \"../DatasetByRecord.dtd\">"            
[3] "<!-- Taken from the R distribution, in turn taken from Henderson and Velleman 1981, "    
[4] "  Building multiple regression models interactively, Biometrics 37 391-411 . "     
[5] "-->"                        
[6] "<dataset name=\"mtcars\" numRecords=\"32\" source=\"R Project\">"         
[7] " <variables count=\"11\">"                   
[8] " <variable unit=\"Miles/gallon\">mpg</variable>"             
[9] " <variable>cyl</variable>"