如何修复“value null Copy-Item Powershell”错误

Question

我想为 mdt 创建一个 powershell installer/uninstaller，但我最终遇到了以下错误。

代码工作正常，它很好地复制了目标中的整个文件架构和文件夹，但最后出现错误，我不明白到底发生了什么以及有什么问题

"Impossible d’appeler une méthode dans une expression Null."

"Cannot call a method in a Null expression."

Impossible d’appeler une méthode dans une expression Null. Au caractère C:\Users\Administrateur\Desktop\Notepad++\ScriptInstallNotepad++\Install_NotepadPlusPlus.ps1:24 : 3 + $dir = $item.DirectoryName.Replace($fromFolder,$toFolder) + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation : (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull

Test-Path : Impossible de lier l'argument au paramètre « Path », car il a la valeur Null. Au caractère C:\Users\Administrateur\Desktop\Notepad++\ScriptInstallNotepad++\Install_NotepadPlusPlus.ps1:26 : 24 + if (!(test-path($dir))) + ~~~~~~ + CategoryInfo : InvalidData : (:) [Test-Path], ParameterBindingValidationException + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.TestPathCommand

我的脚本 powershell

# Script install App MDT
# ----------- Modifier variable apres cette ligne -----------
# ------------- Modify variable after this line -------------

$NameApp = "Notepad++"
$Installer32 = "npp.7.7.1.Installer.exe"
$Installer64 = "npp.7.7.1.Installer.x64.exe"
$arguments = "/S"
$uninstaller32or64 = "Notepad++\uninstall.exe"
$argumentsUninstall = "/S"

# --------------- Ne rien modifier apres cette ligne ---------------
# ------------- Do not modify anything after this line -------------

$SourceLanguageNotepadPlusPlus = "$(Get-Location)\AppDadaNotepad++Hidden\Notepad++"
$SourcePluginNotepadPlusPlus = "$(Get-Location)\ComparePlugin"
$DestinationLanguageNotepadPlusPlus = "C:\Users\Default\AppData\Roaming\Notepad++"
$DestinationPluginNotepadPlusPlus = "C:\Program Files\Notepad++\plugins\ComparePlugin"

function CopyFilesToFolder ($fromFolder, $toFolder) {
    $childItems = get-childitem $fromFolder -recurse
    foreach ($item in $childItems)
    {
        $dir = $item.DirectoryName.Replace($fromFolder,$toFolder)
        $target = $item.FullName.Replace($fromFolder,$toFolder)
        if (!(test-path($dir)))
        {
            mkdir $dir
        }
        if (!(test-path($target)))
        {
            copy-item -path $item.FullName -destination $target -recurse -force
        }
    }
}

# Uninstall
Write-Host "Uninstall $NameApp" -ForegroundColor Cyan
If ((Test-Path "${env:ProgramFiles(x86)}\Notepad++\uninstall.exe" -PathType Leaf) -or (Test-Path "${Env:ProgramFiles}\Notepad++\uninstall.exe" -PathType Leaf))
{
    If (Test-Path "${env:ProgramFiles(x86)}$uninstaller32or64" -PathType Leaf)
    {
        Write-Host "TEST Desinstallation $NameApp ProgramFilesX86" -ForegroundColor Magenta
        $executableSupprFinal = "${env:ProgramFiles(x86)}$uninstaller32or64"
        start-process $executableSupprFinal $argumentsUninstall -PassThru -Verb RunAs -Wait #-NoNewWindow
        Write-Host "Desinstallation $NameApp reussi" -ForegroundColor Yellow
    }
    elseif (Test-Path "${Env:ProgramFiles}$uninstaller32or64" -PathType Leaf)
    {
        Write-Host "TEST Desinstallation $NameApp ProgramFiles" -ForegroundColor Magenta
        $executableSupprFinal = "${env:ProgramFiles}$uninstaller32or64"
        start-process $executableSupprFinal $argumentsUninstall -PassThru -Verb RunAs -Wait #-NoNewWindow
        Write-Host "Desinstallation $NameApp reussi" -ForegroundColor Yellow
    }
    else
    {
        Write-Host "Desinstaller $NameApp introuvable" -ForegroundColor Red
    }
}
else
{
    Write-Host "$NameApp NON presente" -ForegroundColor Green
}


# Install
Write-Host "Installation $NameApp" -ForegroundColor Green
If (Test-Path "${env:ProgramFiles(x86)}")
{
    $Installer = $Installer64
    $InstallerFinal = "$(Get-Location)$Installer"
    start-process $InstallerFinal $arguments -PassThru -Verb RunAs -Wait #-NoNewWindow
    #Copy Item from Deployroot
    Write-Host "Copie auxiliere $NameApp" -ForegroundColor Green
    CopyFilesToFolder "$SourceLanguageNotepadPlusPlus" "$DestinationLanguageNotepadPlusPlus"
    CopyFilesToFolder "$SourcePluginNotepadPlusPlus" "$DestinationPluginNotepadPlusPlus"
}
Else 
{
    $Installer = $Installer32
    $InstallerFinal = "$(Get-Location)$Installer"
    start-process $InstallerFinal $arguments -PassThru -Verb RunAs -Wait #-NoNewWindow
    #Copy Item from Deployroot
    Write-Host "Copie auxiliere $NameApp" -ForegroundColor Green
    CopyFilesToFolder "$SourceLanguageNotepadPlusPlus" "$DestinationLanguageNotepadPlusPlus"
    CopyFilesToFolder "$SourcePluginNotepadPlusPlus" "$DestinationPluginNotepadPlusPlus"
}

Write-Host "Fin install $NameApp" -ForegroundColor Green

Answer 1

所以，正如我在评论中提到的，当 $item 是一个文件夹时，你引用了一个不存在的属性，并试图调用它的方法，所以你会出错。不过，实际上，您这样做很困难。 PowerShell 将递归地为您复制内容，无需像您一样手动执行。与其编写自己的函数，不如这样做：

# Make sure the destination folder exists
If(!(Test-Path $DestinationLanguageNotepadPlusPlus)){New-Item $DestinationLanguageNotepadPlusPlus -ItemType Directory -Force|Out-null}
# Copy source folder contents to destination folder recursively
Copy-Item "$SourceLanguageNotepadPlusPlus\*" -dest "$DestinationLanguageNotepadPlusPlus" -recurse -force

如何修复“value null Copy-Item Powershell”错误

How to fix ‘value null Copy-Item Powershell' Error

windows

powershell

null

copy-item

powershell-5.0