如何处理带有FOR循环的批处理文件中的"net use"命令错误输出? [英] How to process 'net use' command error output in batch file with a FOR loop?

问题描述

我正在批处理文件中使用net use命令来连接远程位置.
我想将其输出存储到变量中并进行处理.
命令成功完成后，我的代码可以正常工作.

但是，如果出现一些错误(例如密码错误)，那么我将无法将错误输出存储在变量中.它直接打印到运行脚本的控制台窗口.请提供以下帮助:

1. 为什么会这样?
   为什么在命令输出中出现错误时，我无法将输出存储在变量中?
2. 是否有适当的方法来记录"net use"命令的ERROR输出?

以下是我的代码:

:connNEWlocation
echo Connecting required remote location...
for /f "tokens=1,2,3,4,5,6,7,8 delims=*" %%a IN ('net use  \\!hostaddress!\!user! /user:!user! !user_pass!') DO (
    if "%%a"=="The command completed successfully." (
        echo Connected successfully^!
    ) else (
        echo ERROR:"%%a"
        echo do something based on error obtained here                      
    )
)

解决方案

将错误输出写入以处理 STDERR (标准错误).但是 FOR 仅捕获为处理 STDOUT 而编写的标准输出，该输出是在以cmd.exe /C为背景的单独命令过程中在两个'之间运行命令行的./p>

该解决方案使用的是2>&1，正如Microsoft在有关

解决方案

The error output is written to handle STDERR (standard error). But FOR captures only standard output written to handle STDOUT on running the command line between the two ' in a separate command process started with cmd.exe /C in the background.

The solution is using 2>&1 as Microsoft explains in article about Using Command Redirection Operators.

The two operators > and & must be escaped in this case with caret character ^ to be interpreted first as literal characters on parsing the entire FOR command line by Window command processor before the FOR command line is executed at all.

for /F "delims=" %%a in ('net use \\!hostaddress!\!user! /user:!user! !user_pass! 2^>^&1') do (

"delims=" disables splitting up the captured line(s) into tokens using space and horizontal tab character as delimiters because it defines an empty list of delimiters.

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