Powershell：捕获程序stdout和stderr以分隔变量 [英] Powershell: Capture program stdout and stderr to separate variables

问题描述

在一次运行中，可以将stdout从外部程序重定向到变量，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!";
 }

一个无聊的例子，但我想知道是否可能？

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

推荐答案

最简单的方法是使用stderr输出的文件，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 ... }

我还将使用$ LastExitCode来检查本地控制台exes的错误。

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

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