将实时 CMD 输出发送到函数

Question

我正在尝试运行一个 PowerShell 脚本运行s CMD 命令并将实时流发送回 PowerShell。

从流中返回的每一行，我都试图发送给一个函数；但是，它仅在 cmd 运行的末尾而不是在它期间传递给函数。

重要的是，如果我将流传递给 'out-host'，我可以看到结果。

你能帮忙吗？


    function get-ValidateProgress
    {
         param ([Parameter(Mandatory,HelpMessage='Value Passed from ValidateLDS.exe',Position=0,ValueFromPipeline)]$ValidateLine)
         IF($ValidateLine -like 'Proccessing Active Users record*' )
         {
            $Current=$ValidateLine -replace 'Proccessing Active Users record ','' -replace 'of.*','' -replace ' ',''
            $TotalValue=$ValidateLine -replace "Proccessing Active Users record $Current of ",''
            [INT]$Progress=(($Current/$TotalValue)*100)
            Write-Progress -Id 1 -Activity ValidateDBLDS -Status 'Proccessing LDS User records' -PercentComplete $Progress -CurrentOperation 'Active Users'
            IF($Current -eq $TotalValue){write-host 'Finished procccsing Active Users' -ForegroundColor Green}
         }
         ELSEIF($ValidateLine -like 'Proccessing Deleted Users record*' )
         {
            $Current=$ValidateLine -replace 'Proccessing Deleted Users record ','' -replace 'of.*','' -replace ' ',''
            $TotalValue=$ValidateLine -replace "Proccessing Deleted Users record $Current of ",''
            [INT]$Progress=(($Current/$TotalValue)*100)
            Write-Progress -Id 1 -Activity ValidateDBLDS -Status 'Proccessing LDS User records' -PercentComplete $Progress -CurrentOperation 'Deleted Users'
            IF($Current -eq $TotalValue){write-host 'Finished procccsing Deleted Users' -ForegroundColor Green}
         }
    }



    Try{
    $cmdOutput = cmd.exe /c "cd /d D:$Campus\Code\Utilities && ValidateDBLDS.exe /viewonly:false" 2>&1 | get-ValidateProgress

    Write-Host "Successfully finished LDS Validation." -ForegroundColor Green
    sleep -Seconds 2
    }
    Catch{
    Write-host "An Error occured during validating LDS. See full expection below.`nExecption:"$Error[0].Exception"`nTargetObject:"$Error[0].TargetObject"`nInvocationInfo:"$Error[0].InvocationInfo -ForegroundColor Red
    }

Answer 1

为了让您的函数通过管道接收 streaming 输入 - 即输出对象（在外部程序的情况下是 lines) 因为它们是由上游命令发出的 - 它必须使用process块.

使用一个简化的例子：

function foo {
  # A process block is executed for each pipeline input object.
  # In the case of *external programs*, each *line* of output constitutes
  # an input object.
  process {
    "[$_]"
  }
}

cmd /c 'echo 1 & timeout 2 >NUL & echo 2 ' | foo

执行此操作将回显 [1 ] 在 2 秒睡眠 timeout.exe 调用启动之前，证明 cmd /c 输出已处理以流式传输的方式。

缺少 process 块的函数的处理方式就好像其主体包含在 end 块中一样，即在所有管道输入完成后 调用的块收到.

见Piping Objects to Functions。

将实时 CMD 输出发送到函数

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