Lock-UserInput.ps1
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Script
Function Lock-UserInput {
[CmdletBinding()]
param
(
# number of seconds to lock
[int]
$LockSeconds = 10,
# message shown. Use {0} to insert remaining seconds
# do not use {0} for a static message
[string]
$Title = 'wait for {0} more seconds...',
# dim screen
[Switch]
$DimScreen
)
# when run without administrator privileges, the keyboard will not be blocked!
# get access to API functions that block user input
# blocking of keyboard input requires admin privileges
$code = @'
[DllImport("user32.dll")]
public static extern int ShowCursor(bool bShow);
[DllImport("user32.dll")]
public static extern bool BlockInput(bool fBlockIt);
'@
$userInput = Add-Type -MemberDefinition $code -Name Blocker -Namespace UserInput -PassThru
# get access to UI functionality
Add-Type -AssemblyName PresentationFramework
Add-Type -AssemblyName PresentationCore
# # set window opacity
# $opacity = 1
# if ($DimScreen) { $opacity = 200 }
# # create a message label
# $label = New-Object -TypeName Windows.Controls.Label
# $label.FontSize = 60
# $label.FontFamily = 'Consolas'
# $label.FontWeight = 'Bold'
# $label.Background = 'Transparent'
# $label.Foreground = 'Blue'
# $label.VerticalAlignment = 'Center'
# $label.HorizontalAlignment = 'Center'
# # create a window
# $window = New-Object -TypeName Windows.Window
# $window.WindowStyle = 'None'
# $window.AllowsTransparency = $true
# $color = [Windows.Media.Color]::FromArgb($opacity , 0, 0, 0)
# $window.Background = [Windows.Media.SolidColorBrush]::new( $color)
# $window.Opacity = 0.8
# $window.Left = $window.Top = 0
# $window.WindowState = 'Maximized'
# $window.Topmost = $true
# $window.Content = $label
# block user input
$null = $userInput::BlockInput($true)
$null = $userInput::ShowCursor($false)
# show window and display message
$null = $window.Dispatcher.Invoke{
$window.Show()
$LockSeconds..1 | ForEach-Object {
$label.Content = ($title -f $_)
$label.Dispatcher.Invoke([Action] { } , 'Background')
Start-Sleep -Seconds 1
}
$window.Close()
}
# unblock user input
$null = $userInput::ShowCursor($true)
$null = $userInput::BlockInput($false)
}
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