windows – powershell 2.0重定向文件处理异常

我正在寻找一个解决方案,OS句柄的位置不是FileStream所期望的.不要在一个FileStream和Win32代码或另一个FileStream中同时使用句柄.异常,也适用于包含 “the fix”的脚本中调用的脚本.

出于这个问题的目的,假设我有两个脚本：

foo.ps1

# <fix>
$bindingFlags = [Reflection.BindingFlags] "Instance,NonPublic,GetField"
$objectRef = $host.GetType().GetField( "externalHostRef",$bindingFlags ).GetValue( $host )
$bindingFlags = [Reflection.BindingFlags] "Instance,GetProperty"
$consoleHost = $objectRef.GetType().GetProperty( "Value",$bindingFlags ).GetValue( $objectRef,@() )
[void] $consoleHost.GetType().GetProperty( "IsStandardOutputRedirected",$bindingFlags ).GetValue( $consoleHost,@() )
$bindingFlags = [Reflection.BindingFlags] "Instance,GetField"
$field = $consoleHost.GetType().GetField( "standardOutputWriter",$bindingFlags )
$field.SetValue( $consoleHost,[Console]::Out )
$field2 = $consoleHost.GetType().GetField( "standardErrorWriter",$bindingFlags )
$field2.SetValue( $consoleHost,[Console]::Out )
# </fix>

write-host "normal"
write-error "error"
write-host "yay"
.bar.ps1

bar.ps1

write-host "normal"
write-error "error"
write-host "yay"

并且foo.ps1正在运行如下：

powershell .foo.ps1 > C:tempredirecct.log 2>&1

预期的输出应该是：

normal
C:foo.ps1 : error
At line:1 char:10
+ .foo.ps1 <<<<
    + CategoryInfo          : NotSpecified: (:) [Write-Error],WriteErrorException
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,foo.ps1

yay
normal
C:bar.ps1 : error
At C:foo.ps1:17 char:6
+ .bar <<<<  2>&1
    + CategoryInfo          : NotSpecified: (:) [Write-Error],bar.ps1

yay

但是,由于已知错误,输出实际上是：

normal
C:foo.ps1 : error
At line:1 char:10
+ .foo.ps1 <<<< 
    + CategoryInfo          : NotSpecified: (:) [Write-Error],foo.ps1

yay
normal
out-lineoutput : The OS handle's position is not what FileStream expected. Do not use a handle simultaneously in one FileStream and in Win3
2 code or another FileStream. This may cause data loss.
    + CategoryInfo          : NotSpecified: (:) [out-lineoutput],IOException
    + FullyQualifiedErrorId : System.IO.IOException,Microsoft.PowerShell.Commands.OutLineOutputCommand

因此,观察到的行为是“修复”所做的更改不会被“子”脚本继承(在本例中为bar.ps1).当bar.ps1尝试写入时,它会崩溃.如果我不在foo.ps1中以某种方式防范它,它也会崩溃.在调用bar.ps1之前/我可以做什么来防止bar.ps1在尝试写入时崩溃？

约束：

> Powershell 2.0
>必须按上述方式运行脚本
>我无法修改bar.ps1(写入stderr时不应该崩溃).

UPDATE

以下是半可接受的解决方案.我说一半,因为它只会阻止’父’脚本崩溃. ‘child’脚本在尝试写入时仍然很难.从好的方面来说,它可以认识到酒吧失败了.

foo.ps1：

function savepowershellfromitself {
    $bindingFlags = [Reflection.BindingFlags] "Instance,GetField"
    $objectRef = $host.GetType().GetField( "externalHostRef",$bindingFlags ).GetValue( $host )
    $bindingFlags = [Reflection.BindingFlags] "Instance,GetProperty"
    $consoleHost = $objectRef.GetType().GetProperty( "Value",@() )
    [void] $consoleHost.GetType().GetProperty( "IsStandardOutputRedirected",@() )
    $bindingFlags = [Reflection.BindingFlags] "Instance,GetField"
    $field = $consoleHost.GetType().GetField( "standardOutputWriter",$bindingFlags )
    $field.SetValue( $consoleHost,[Console]::Out )
    $field2 = $consoleHost.GetType().GetField( "standardErrorWriter",$bindingFlags )
    $field2.SetValue( $consoleHost,[Console]::Out )
}

savepowershellfromitself
write-host "normal"
write-error "error"
write-host "yay"
$output = .bar.ps1 2>&1
savepowershellfromitself
write-host "$output"
if( $errors = $output | ?{$_.gettype().Name -eq "ErrorRecord"} ){
    write-host "there were errors in bar!"
}
write-error "error2"
write-host "done"

# <fix>
$bindingFlags = [Reflection.BindingFlags] "Instance,$bindingFlags ).GetValue(     $objectRef,$bindingFlags).GetValue( $consoleHost,[Console]::Out )
# </fix>

write-host "normal"
write-error "error"
write-host "yay"

powershell .bar.ps1 2>&1 | more

powershell .foo.ps1 2>&1 | more

write-host "normal"
write-error "error"
write-host "yay"

.bar.ps1