在 Powershell 中将字符串变量作为参数传递

Question

我正在尝试编写一个 PowerShell 脚本来将 I: 的驱动器盘符更改为其他内容。这是脚本。

$driveI = Get-WmiObject -Class win32_volume -Filter "DriveLetter='I:'"

if ($driveI.SerialNumber=""){

    write-host "I: is free..."

}   else  {

    write-host "I: is occupied"
    foreach ( $s in @("'Z:'", "'Y:'", "'X:'", "'W:'", "'V:'", "'U:'", "'T:'", "'R:'", "'Q:'", "'P:'", "'O:'", "'N:'", "'M:'", "'L:'", "'K:'", "'J:'", "'H:'", "'G:'", "'F:'", "'E:'", "'D:'", "'B:'", "'A:'"))
    {
        $testdrv = Get-WmiObject -Class win32_volume -Filter "DriveLetter=$s"

        if (!$testdrive.Exist)
        {
            $s = '"'+$s.Trim([char]0x0027)+'"'
            Set-WmiInstance -input $driveI -Arguments @{DriveLetter=$s}
            Write-Host I: has been moved to $s
            break
        }
    }
}

请允许我向您介绍一下脚本。 $driveI 用于检索有关 I: 的所有信息。现在，如果 I: 没有序列号，则表明 I: 不存在。另一方面，如果 I: 存在，我正试图找到一个可用的驱动器号。我正在使用 foreach 循环执行我的搜索。现在，当我们调用 Get-WmiObject 时，我们使用带单引号的驱动器号。但是当我们使用 Set-WmiInstance 时，我们使用双引号。但是，即使我将 $s 修改为用双引号括起来，它也不起作用。简而言之，如果我使用 Write-Host $s，我得到的输出是 "E:"。当我使用 Set-WmiInstance -input $driveI -Arguments @{DriveLetter="E:"} 时，它起作用了。但是当我使用 Set-WmiInstance -input $driveI -Arguments @{DriveLetter=$s} 时，它不起作用。谁能告诉我我做错了什么？

Answer 1

无论如何，当您稍后要删除引号时，不要在字符串中加上引号。而是在您实际需要的地方添加引号：

$driveLetters = 'Z:', 'Y:', 'X:', ..., 'D:', 'B:', 'A:'
foreach ( $s in $driveLetters ) {
    $testdrv = Get-WmiObject -Class Win32_Volume -Filter "DriveLetter='$s'"

    if (-not $testdrv) {
        Set-WmiInstance -input $driveI -Arguments @{DriveLetter=$s}
        Write-Host "I: has been moved to $s"
        break
    }
}

Answer 2

有点笨拙，但这段代码有效。我会采纳你的建议，摆脱 Trim 混乱局面。

$driveI = Get-WmiObject -Class win32_volume -Filter "DriveLetter='I:'"

if ($driveI -eq $null)  {

    write-host "I: is free..."

}  else    {    
    write-host "I: is occupied..."
    foreach ( $s in @("'Z:'", "'Y:'", "'X:'", "'W:'", "'V:'", "'U:'", "'T:'", "'R:'", "'Q:'", "'P:'", "'O:'", "'N:'", "'M:'", "'L:'", "'K:'", "'J:'", "'H:'", "'G:'", "'F:'", "'E:'", "'D:'", "'B:'", "'A:'"))
    {
        $testdrv = Get-WmiObject -Class win32_volume -Filter "DriveLetter=$s"

        if ($testdrv -eq $null)
        {
            $s = $s.Trim([char]0x0027)
            Set-WmiInstance -input $driveI -Arguments @{DriveLetter=$s}
            Write-Host I: has been moved to $s
            break
        }
    }
}

在 Powershell 中将字符串变量作为参数传递

Passing string variable as Argument in Powershell

string

powershell

wmi

wmic