更多闪烁乐趣

#requires -version 3.0

Function Read-Host2 {

<#
.Synopsis
An alternative to Read-Host
.Description
This is an alternative to Read-Host which works almost the same as the original cmdlet. You can use this to prompt the user for input. They can either enter text or have the text converted to a secure string. The only difference is that the prompt will display in a flashing colors until you start typing.

This command will NOT work properly in the PowerShell ISE.
.Parameter Prompt
The text to be displayed. A colon will be appended.
.Parameter AsSecureString
The entered text will be treated as a secure string. This parameter has an alias of 'ss'.
.Parameter UseForeground
Flash the text color instead of the background. This parameter has aliases of 'fg' and 'foreground'.
.Example
PS C:\> $user = Read-Host2 "Enter a username" -color DarkGreen

Prompt for user name using a dark green background
.Example
PS C:\> $pass = Read-Host2 "Enter a password" -color darkred -foreground -asSecureString
Prompt for a password using DarkRed as the foreground color.
.Example
PS C:\> $s={ $l = get-eventlog -list ; Read-host2 "Press enter to continue" ; $l}
PS C:\> &$s
Press enter to continue :


  Max(K) Retain OverflowAction        Entries Log
  ------ ------ --------------        ------- ---
  20,480      0 OverwriteAsNeeded      30,829 Application
  20,480      0 OverwriteAsNeeded           0 HardwareEvents
     512      7 OverwriteOlder              0 Internet Explorer
  20,480      0 OverwriteAsNeeded           0 Key Management Service
  20,480      0 OverwriteAsNeeded          12 Lenovo-Customer Feedback
     128      0 OverwriteAsNeeded         455 OAlerts
     512      7 OverwriteOlder              0 PreEmptive
  20,480      0 OverwriteAsNeeded      32,013 Security
  20,480      0 OverwriteAsNeeded      26,475 System
  15,360      0 OverwriteAsNeeded      17,715 Windows PowerShell

 This is an example of how you might use the command in a script. The prompt will keep flashing until you press Enter.
.Notes
Last Updated: August 18, 2014
Version     : 0.9
Learn more:
 PowerShell in Depth: An Administrator's Guide (http://www.manning.com/jones2/)
 PowerShell Deep Dives (http://manning.com/hicks/)
 Learn PowerShell in a Month of Lunches (http://manning.com/jones3/)
 Learn PowerShell Toolmaking in a Month of Lunches (http://manning.com/jones4/)

  ****************************************************************
  * DO NOT USE IN A PRODUCTION ENVIRONMENT UNTIL YOU HAVE TESTED *
  * THOROUGHLY IN A LAB ENVIRONMENT. USE AT YOUR OWN RISK.  IF   *
  * YOU DO NOT UNDERSTAND WHAT THIS SCRIPT DOES OR HOW IT WORKS, *
  * DO NOT USE IT OUTSIDE OF A SECURE, TEST SETTING.             *
  ****************************************************************

.Link
https://jdhitsolutions.com/blog/2014/08/more-flashing-fun

.Link
Read-Host
ConvertTo-SecureString
#>

[cmdletbinding()]
Param(
[Parameter(Position=0,Mandatory,HelpMessage="Enter a prompt message without a colon (:)")]
[string]$Prompt,
[Alias('ss')]
[switch]$AsSecureString,
[System.ConsoleColor]$Color = "Red",
[Alias("fg","Foreground")]
[switch]$UseForeground
)

#this will be the array of entered characters
$text = @()

#save current background and foreground colors
$bg = $host.ui.RawUI.BackgroundColor
$fg = $host.ui.RawUI.ForegroundColor

#set a variable to be used in a While loop 
$Running = $True

#set a variable to determine if the user is typing something
$Typing = $False

#get current cursor position
$Coordinate = $host.ui.RawUI.CursorPosition

$msg = "`r$Prompt : "

While ($Running) {

 if (-Not $Typing) {
    #don't toggle or pause if the user is typing
    if ($UseForeground) {
        if ($host.ui.RawUI.ForegroundColor -eq $fg) {
            $host.ui.RawUI.ForegroundColor = $color

        }
        else {
            $host.ui.RawUI.ForegroundColor = $fg
        }
    }
    else {
        if ($host.ui.RawUI.BackgroundColor -eq $bg) {
            $host.ui.RawUI.BackgroundColor = $color

        }
        else {
            $host.ui.RawUI.BackgroundColor = $bg
        }
    }
      Start-Sleep -Milliseconds 350
    } #if not typing

    #set the cursor position
    $host.ui.rawui.CursorPosition=$Coordinate

    #write the message on a new line
    
    Write-Host $msg
  
    #see if a key has been pushed
    if ($host.ui.RawUi.KeyAvailable) {
        #user is typing
        $Typing = $True
        
        #filter out shift key 
        $key = $host.ui.RawUI.ReadKey("NoEcho,IncludeKeyDown") 
        
        Switch ($key.virtualKeyCode) {
        
            13 { $Running = $False ; Break}
            16 { #Shift key so don't do anything
                 Break
               }
            Default{
                #add the key to the array
                $text+=$key

                #display the entered text
                if ($AsSecureString) {
                  #mask the character if asking for a secure string
                  $out = "*"
                }
                else {
                  $out = $key.character
                }
                #append the character to the prompt
                $msg+= $out
            }
      } #switch
  
    } #if key available
    
} #while

#reset the original background color
$host.ui.RawUI.BackgroundColor = $bg
$host.ui.RawUI.ForegroundColor = $fg

#write the input to the pipeline
#removing any leading or trailing spaces
$data = (-join $text.Character).Trim()

#convert to SecureString if specified
if ($AsSecureString) {
 ConvertTo-SecureString -String $data -AsPlainText -Force
}
else {
    #write the read data to the pipeline
    $data
}
 
} #end function

我所做的主要调整是收集所有键入的键，直到按下 Enter 键。我有一个 Switch 结构来消除 Shift 键。假设您正在编写文本，因此这应该是您将使用的唯一非字母数字键。消息提示将持续闪烁，直到您开始输入。我还模拟了在屏幕上回显文本，包括密码屏蔽（如果您使用 AsSecureString）。最后一个更改是一个新参数，允许您闪烁前景色而不是背景色。基于注释的帮助中有几个示例。

这是一些屏幕截图。

我希望你能让我知道你的想法。