Powershell ReadKey()区分大小写

Question

在我的脚本中，我需要从用户那里获得一个字符，并且在没有等待进入的情况下立即处理它。此外，我想处理字符区分大小写。

write-host("Please press a or A:")
$choice = ($host.UI.RawUI.ReadKey(('NoEcho,IncludeKeyUp,IncludeKeyDown'))).character

if($choice -ceq "a")
{
    write-host("You pressed a");
}
elseif($choice -ceq "A")
{
    write-host("You pressed A");
}
else
{
    Write-Host("You pressed neither a nor A")
}
Pause

这段代码的问题是，当我试图按"A“时，它会显示”您没有按a或A“。原因是要键入" A“，我必须先按Shift，Powershell检测按下的移位并立即处理，而无需等待A。

有人知道怎么解决这个问题吗？

Answer 1

尝试以下代码片段：

if ( $Host.Name -eq 'ConsoleHost' ) {
    Write-Host "Please press a or A:"
    Do  {
            $choice = $host.UI.RawUI.ReadKey(14)
        } until ( $choice.VirtualKeyCode -in @( 48..90) )

    if ( $choice.Character -ceq "a") {
        Write-Host "You pressed a";
    }
    elseif ( $choice.Character -ceq "A") {
        Write-Host "You pressed A";
    }
    else {
        Write-Host "You pressed neither a nor A ($($choice.Character))";
    }
} else {
    # e.g. Windows PowerShell ISE Host:
    # the "ReadKey" method or operation is not implemented.
    Write-Host '$Host.Name -neq ConsoleHost' -ForegroundColor Magenta
}

正如目前所写的，$choice.VirtualKeyCode -in @( 48..90)条件允许一些(有限的)可打印字符子集。根据键Enum…调整它

Answer 2

以下这些是否弥补了人们的期望，

($key = $Host.UI.RawUI.ReadKey()) | % { if ($_.VirtualKeyCode -eq '16') {
            $key = $Host.UI.RawUI.ReadKey()
        }
        $Choice = $key.Character
        if ($Choice -ceq "a"){
            "`rYou pressed 'a'"
        }
        elseif ($Choice -ceq "A"){
            "`rYou pressed 'A'"
        }
        else {
            "`rYou neither pressed 'a' nor 'A'"
        }
    }