Powershell：將輸出傳遞給方法并分離錯誤流

我正在嘗試將我的腳本的輸出通過管道傳輸到一個單獨的方法，并嘗試在那里分離錯誤流。這里是pipeline.ps1

Function MyLogs{
    [CmdletBinding()]
    Param(
      [Parameter(ValueFromPipeline=$True)]
      [String[]] $Log
    )
  
    Begin {
       Write-Verbose "initialize stuff"
       # code to initialize stuff
    }
  
    Process {
       Write-Output " $Log"
       
    }
  
    End {    
       # code to clean stuff
    }
 }

#--- pipe the script output to it
& .\MyScript.ps1 | MyLogs

這是MyScript.ps1

Write-Output "********** This is a normal text message ************* `n`r " 

# this would create a divide by zero error
1/0

Write-Warning "example warning"

Write-Output "after the errors"

該呼叫& .\MyScript.ps1 | MyLogs不會將錯誤流通過管道傳輸到，MyLogs()但是錯誤將顯示在控制臺中：

PS D:\Learn\powershell> .\pipelines.ps1
VERBOSE: initialize stuff
 ********** This is a normal text message *************  
 
Attempted to divide by zero.
At D:\Learn\powershell\MyScript.ps1:3 char:1
  1/0
  ~~~
      CategoryInfo          : NotSpecified: (:) [], RuntimeException
      FullyQualifiedErrorId : RuntimeException
 

WARNING: example warning
 after the errors

如果我愿意& .\MyScript.ps1 *>&2 | MyLogs，錯誤流將被讀取為普通文本，我無法弄清楚如何errors將normal text.

uj5u.com熱心網友回復：

主要是，您需要將所有流( *>&1) 或至少將錯誤流重定向到成功流( 2>&1)，以便您的函式可以捕獲來自管道的物件。此外，您的函式的引數應該采用[object]or[object[]]而不是，[string[]]以便您可以參考來自管道的物件型別。

最后，借助-is型別比較運算子和開關，您可以創建一個不錯的日志記錄功能。

using namespace System.Management.Automation

function MyLogs {
    [CmdletBinding()]
    Param(
      [Parameter(ValueFromPipeline = $True)]
      [object] $Log
    )

    begin {
       # code to initialize stuff
    }
    process {
        # this could be reduced to:
        # `@{ $Log.GetType().Name = $Log }`
        switch($Log) {
            { $_ -is [ErrorRecord] } {
                @{ 'Error Record' = $_ }
                break
            }
            { $_ -is [WarningRecord] } {
                @{ 'Warning Record' = $_ }
                break
            }
            { $_ -is [VerboseRecord] } {
                @{ 'Verbose Record' = $_ }
                break
            }
            { $_ -is [InformationRecord] } {
                @{ 'Information Record' = $_ }
                break
            }
            Default {
                @{ 'Success Stream' = $_ }
            }
        }
    }
    end {
       # code to clean stuff
    }
}

& {
    Write-Output 'This is a normal text message'
    1/0
    Write-Host 'Information here...'
    Write-Warning 'example warning'
    Write-Output 'after the errors'
    Write-Verbose 'Hello world!' -Verbose
} *>&1 | MyLogs

我會把它留給你作為練習的進一步更新，這是你可以從這個例子中得到的輸出：

Name                           Value
----                           -----
Success Stream                 This is a normal text message
Error Record                   Attempted to divide by zero.
Information Record             Information here...
Warning Record                 example warning
Success Stream                 after the errors
Verbose Record                 Hello world!

標籤：电源外壳 管道 错误流

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