捕获程序 stdout 和 stderr 以分离变量 [英] Capture program stdout and stderr to separate variables

问题描述

是否可以在一次运行中将 stdout 从外部程序重定向到一个变量，并将 stderr 从外部程序重定向到另一个变量?

Is it possible to redirect stdout from an external program to a variable and stderr from external programs to another variable in one run?

例如:

$global:ERRORS = @();
$global:PROGERR = @();

function test() {
    # Can we redirect errors to $PROGERR here, leaving stdout for $OUTPUT?
    $OUTPUT = (& myprogram.exe 'argv[0]', 'argv[1]');

    if ( $OUTPUT | select-string -Pattern "foo" ) {
        # do stuff
    } else {
        $global:ERRORS += "test(): oh noes! 'foo' missing!";
    }
}

test;
if ( @($global:ERRORS).length -gt 0 ) {
    Write-Host "Script specific error occurred";
    foreach ( $err in $global:ERRORS ) {
        $host.ui.WriteErrorLine("err: $err");
    }
} else {
    Write-Host "Script ran fine!";
}

if ( @($global:PROGERR).length -gt 0 ) {
    # do stuff
} else {
    Write-Host "External program ran fine!";
}

一个乏味的例子，但我想知道这是否可能?

A dull example however I am wondering if that is possible?

推荐答案

最简单的方法是使用文件作为 stderr 输出，例如:

The easiest way to do this is to use a file for the stderr output, e.g.:

$output = & myprogram.exe 'argv[0]', 'argv[1]' 2>stderr.txt
$err = get-content stderr.txt
if ($LastExitCode -ne 0) { ... handle error ... }

我还会使用 $LastExitCode 检查本机控制台 EXE 文件中的错误.

I would also use $LastExitCode to check for errors from native console EXE files.

这篇关于捕获程序 stdout 和 stderr 以分离变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！