我正在通过创建文件连接,path <- file("C:/test.txt")
并且在打印与连接关联的对象时,我可以看到连接的“属性”:
> path
description class mode text opened
"C:/test.txt" "file" "r" "text" "closed"
can read can write
"yes" "yes"
但是,我似乎无法弄清楚如何实际访问各种属性值
这是我到目前为止所尝试的:
> attributes(path)
$class
[1] "file" "connection"
$conn_id
<pointer: 0x0000004b>
> path$description
Error in path$description : $ operator is invalid for atomic vectors
> path["description"]
[1] NA
> file.info(path)
Error in file.info(path) : invalid filename argument
有任何想法吗?