powershell - 在Powershell中检测跨应用程序的按键

Question

这是可以通过Wayback机器在Powershell.com上找到的帖子。它是从2015年开始的，不再在网站上。
链接到这里:Detecting Key Presses Across Applications。

该帖子旨在成为存档。

Answer 1

By accessing the Windows low-level system calls, PowerShell can query the keyboard for pressed keys. The following example waits until the user presses 'A'. This is a simple example that does not consider the state of the SHIFT keys, nor does it check virtual keys. However, it detects key presses across all open applications. So PowerShell will detect a pressed "A" key even if it does not have focus, and you entered "A" into a different application.

#requires -Version 2

$signature = @'
[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)] 
public static extern short GetAsyncKeyState(int virtualKeyCode); 
'@

# load signatures and make members available
$API = Add-Type -MemberDefinition $signature -Name 'Keypress' -Namespace API -PassThru

# wait for 'A'
$waitFor = 'A'
$ascii = [byte][char]$waitFor.ToUpper()

do 
{
  Start-Sleep -Milliseconds 40
} until ($API::GetAsyncKeyState($ascii) -eq -32767)