使用函数中的值并将其传递给另一个函数

Question

我有以下两个函数，我希望在比较函数中使用ROBOCOPY函数的源和目标。任何人都可以告诉我如何做到这一点。谢谢。

Write-Host "==================================" -ForegroundColor Magenta -BackgroundColor White 
Write-Host "Pre-Staging Script for DFSR Server" -ForegroundColor Magenta -BackgroundColor White 
Write-Host "==================================" -ForegroundColor Magenta -BackgroundColor White 
Write-Host "" 
Function GetHot-Fix 
{ 
       Write-Host "==================================" -ForegroundColor Magenta -BackgroundColor White 
       Write-Host "Checking Service Installation" -ForegroundColor Magenta -BackgroundColor White 
       Write-Host "==================================" -ForegroundColor Magenta -BackgroundColor White 
       Write-Host "" 
       write-host "This will check if Hotfix KB979808 is installed." -ForegroundColor Black -BackgroundColor Cyan 
       write-host "This is required for Windows Server 2008 R2 Robocopying" -ForegroundColor Black -BackgroundColor Cyan 
       Write-Host "" 

       Get-HotFix -id KB979808 -ErrorAction SilentlyContinue 

} 

Function Start-MyRobocopy($source,$Target) 
{ 
       Write-Host "=============" -ForegroundColor Magenta -BackgroundColor White 
       Write-Host "Robocopy Data" -ForegroundColor Magenta -BackgroundColor White 
       Write-Host "=============" -ForegroundColor Magenta -BackgroundColor White 
       Write-Host "" 

       $Source = Read-Host "Please enter path of SOURCE" 

       If ($Source -and (Test-Path -Path $Source -PathType Container)) 
       { 
           $Target = Read-Host "Please enter path of TARGET" 
       } 
       Else 
       { 
       Write-Host "Please enter a directory" 
       } 
           If ($Target -and (Test-Path -Path $Target -PathType Container)) 
           { 
           $Output = Read-Host "Please enter where to place output file eg c:\temp\COPY.log" 
           } 
           Else 
           { 
           Write-Host "Please enter a directory" 
           } 


robocopy.exe $Source $Target /b /e /copyall /r:1 /xd dfsrprivate /log:$Output /tee 
} 
Function Comparision 
{ 
       Write-Host "" 
       Write-Host ""  
       Write-Host "===============================================" -ForegroundColor Magenta -BackgroundColor White 
       Write-Host "Checking Directory Count and Folder comparision" -ErrorAction SilentlyContinue -ForegroundColor Magenta -BackgroundColor White 
       Write-Host "===============================================" -ForegroundColor Magenta -BackgroundColor White 
       Write-Host "" 

      #$Source = Read-Host "Please enter Source directory to check" 
      #$Target = Read-Host "Please enter Target directory to check" 
       Write-Host "" 
       If($source -and (Test-Path -Path $source -PathType Container)) 
       { 
       "There are $(@(Get-ChildItem $Source).Count) items in the '$Source' directory" 
       } 
       Else 
       { 
       Write-Host "Please enter a directory" 
           } 
           If($source -and (Test-Path -Path $Target -PathType Container)) 
           { 
           "There are $(@(Get-ChildItem $Target).Count) items in the '$Target' directory" 
       } 
       Else 
       { 
       Write-Host "Please enter a directory" 
       } 

       Write-Host "" 
       $child1 = Get-ChildItem -Path $Source -Recurse -Force 
       $child2 = Get-ChildItem -Path $Target -Recurse -Force 

       Compare-Object $child1 -DifferenceObject $child2 -Property Name 

       Write-Host "" 
       Write-Host "NOTE:" -BackgroundColor Cyan -ForegroundColor Black 
       Write-Host "Any symbols with '=>' mean that the file Does NOT exist in SOURCE but is in the Target" -BackgroundColor Cyan -ForegroundColor Black 
       Write-Host "Any symbols with '<=' mean that the file Does NOT exist in TARGET but is in the Source" -BackgroundColor Cyan -ForegroundColor Black 
} 


$hotfix = GetHot-Fix 
If ($hotfix) { 
       Write-Host "Hotfix installed" -BackgroundColor Green -ForegroundColor Black 
       Write-Host "" 
       Write-Host "Proceeding with Robocopy...." 
       Write-Host "............................" 
       Write-Host "" 
       Start-MyRobocopy 
       } 
else { 
           Write-Host "Hotfix is NOT installed - Please ensure you install this hotfix BEFORE" -ForegroundColor "red" 
     Write-host "Copying any data" -foregroundcolor "red" 
           Write-Host "" 
           return 
       } 

Comparision 

Answer 1

powershell中的变量是上下文相关的。如果我定义的功能如下：

$bar = "Hi" 
function foo { 
    $bar = "Hey!" 
} 
$bar <-- returns "Hi" 

然后$ bar变量在该函数之外对我不可用。为了使变量在函数外可用，您可以控制函数的作用域。如果我使用脚本或全局前缀在函数中设置了一个变量，那么该变量将可用于整个脚本或全局在powershell运行空间中。在这里看到：

function foo { 
    $script:fooVar = "world" 
} 

function bar { 
    foo 
    $global:barVar = "Hello " + $fooVar 
} 

在foo的函数变量$ fooVar将提供给脚本中的所有其他功能因变量$ fooVar的范围前缀脚本。 barVar函数将在运行空间中全局可用。即当脚本完成后，变量仍然存在于命令行，甚至还存在于其他脚本中。

正如你可以在bar函数中看到的，我首先调用foo，然后使用foovVar变量。当我使用$ fooVar变量时，我不必指定$ script：fooVar，如果我想要但不是必需的。

这些都是有效的变量赋值：

$aaa = 123 
$script:bbb = 123 
$global:ccc = 123 

所以你的情况使用$脚本：源和$脚本：目标或$全局：源和$全球：目标。欲了解更多信息运行以下命令：

Help About_Scope 

Answer 2

您有几个选择。其中两个是全局状态（在文件范围内声明$ source和$ target，并且这两个函数都使用它们），并将其作为参数进行比较。假设您的robocopy函数查询源和目标的用户是否为空，那么全局状态是最简单的解决方案。就我个人而言，我可能会编写一个名为Get-SourceAndTarget的第三个函数来处理该部分并输出源和目标，以便将它们传递给Start-MyRobocopy和Comparison。我并没有很好地攻击powershell，所以我对语法有点不清楚，但这可能会让你开始。

Answer 3

的hackish的方式是把它添加到顶部：

$Gobal:source = "" 
$Gobal:target = "" 

和搜索，并用$ Gobal替换$来源：源和$目标与$ Gobal ：target - 那么你可以在脚本的任何一点使用这些新的全局变量。

正如建议你可以在另一个功能，但一个简单的工作\自动化任务，可能是矫枉过正保护他们。取决于它的用途。