如何将warnings()输出到字符串 [英] How to get warnings() output to string

问题描述

当我输入warnings()进行控制台时，我回来了

When I type warnings() to console, I get back

Warning message:
In fread(my_directory,  ... :
 C function strtod() returned ERANGE for one or more fields. The first was string input    '4.40589099726375E-309'. It was read using (double)strtold() as numeric

但是，当我键入 as.character(warnings())时，我得到:

However when I type as.character(warnings()), I get:

[1] "fread(my_directory)"

我的目标是将warning()中显示的 actual 消息转换为字符串，以便将其传递给 logwarn 函数.记录包.目前，我正在执行 logwarn(warnings()，logger ="some_log_file.log")来记录我的警告，但它给我在上面显示的 character 施加了不正确的强制性

My objective is to get the actual message displayed in warning() into a character string, so that I can pass it to the logwarn function in the logging package. Currently, I am doing logwarn(warnings(),logger="some_log_file.log") to record my warnings, but it gives the incorrect coercion to character that I displayed above.

请注意，我只能使用 sink ，但是我想坚持使用 logging 包，因此我需要能够将强制性更正为 character

Note that I can just use sink but I want to stick with logging package, so I require the ability to correct coerce to character.

推荐答案

这可能不是您要找的确切答案，但我认为值得一提.

This may not be the exact answer you're looking for, but I think it's worth a mention.

R有一个全局变量 last.warning ，它仅包含最后一个警告.在其上调用 names 将返回最后的警告作为字符串.这是一个小例子

R has a global variable, last.warning, which holds just that, the last warning. Calling names on it will return the last warning as a character string. Here's a little example

首先，故意触发警告:

x <- 1:5
if(x == 1) "yes" else "no"
# [1] "yes"
# Warning message:
# In if (x == 1) "yes" else "no" :
#   the condition has length > 1 and only the first element will be used

看变量last.warning:

last.warning
# $`the condition has length > 1 and only the first element will be used`
# if (x == 1) "yes" else "no"

现在查看名称(last.warning).这将以字符串形式返回警告:

Now look at the names(last.warning). This returns the warning as a character string:

names(last.warning)
# [1] "the condition has length > 1 and only the first element will be used"

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