如何将类的对象“HTMLInternalDocument”“XMLInternalDocument”转换为类“字符”的对象？ （scrapeR包）

Question

如何将类的对象“HTMLInternalDocument”“XMLInternalDocument”直接转换为类“字符”的对象？ （刮包）

Answer 1

您可以将其转储到一个文件中，并使用您最喜欢的方法阅读相关部分。

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

阅读，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>"