如何使用PowerShell捕获全局按键? [英] How to capture global keystrokes with PowerShell?

问题描述

Powershell可以侦听并捕获按键吗?

Can Powershell listen for and capture key presses?

是否可以编写一个PowerShell脚本，例如 AutoHotkey ，它位于托盘中并等待直到您按预定义的键盘键开始执行?可能每次您按下该键时都不会返回而是开火?

Is it possible to write a PowerShell script that, like AutoHotkey, sits in tray and waits until you press a predefined keyboard key to start execution? And possibly not return but fire every time you press said key?

我要实现的是-仅在启动脚本后按下按钮才能执行预定义的脚本操作，因此将其放在桌面上并定义快捷键是行不通的.

What I would like to achieve is - perform a predefined scripted action at the press of a button only AFTER starting the script, so putting it on the desktop and defining a shortcut key doesn't work.

例如:
我希望每次按"x"键时都要键入3次"TEST"文本，但是我希望只有在执行此操作的脚本正在运行时才会发生这种情况.因此，当脚本未运行时-按"x"将无济于事.

For example:
I'd like the text "TEST" typed 3 times every time I press the "x" key but I would like this to happen only if the script that does this is running. So when the script is not running - pressing "x" would do nothing.

基本上，AutoHotkey可以做到这一点，但是我想在PowerShell中尽可能地做到这一点，而无需编写大量的C#代码，因为那样的话，我将为此编写一个小型的C#托盘应用程序.

Basically, AutoHotkey can do exactly that but I'd like to do it in PowerShell, if possible, without writing huge amounts of C# code, because then I'd just write a tiny C# tray application for that.

推荐答案

也许不是直接在PowerShell中，但由于您几乎可以运行任何C#代码，因此以下是基于

Not in PowerShell directly maybe, but as you can run pretty much any C# code, here is a basic working example based on an excellent solution by Peter Hinchley:

Add-Type -TypeDefinition '
using System;
using System.IO;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace KeyLogger {
  public static class Program {
    private const int WH_KEYBOARD_LL = 13;
    private const int WM_KEYDOWN = 0x0100;

    private static HookProc hookProc = HookCallback;
    private static IntPtr hookId = IntPtr.Zero;
    private static int keyCode = 0;

    [DllImport("user32.dll")]
    private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

    [DllImport("user32.dll")]
    private static extern bool UnhookWindowsHookEx(IntPtr hhk);

    [DllImport("user32.dll")]
    private static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hMod, uint dwThreadId);

    [DllImport("kernel32.dll")]
    private static extern IntPtr GetModuleHandle(string lpModuleName);

    public static int WaitForKey() {
      hookId = SetHook(hookProc);
      Application.Run();
      UnhookWindowsHookEx(hookId);
      return keyCode;
    }

    private static IntPtr SetHook(HookProc hookProc) {
      IntPtr moduleHandle = GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName);
      return SetWindowsHookEx(WH_KEYBOARD_LL, hookProc, moduleHandle, 0);
    }

    private delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);

    private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam) {
      if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN) {
        keyCode = Marshal.ReadInt32(lParam);
        Application.Exit();
      }
      return CallNextHookEx(hookId, nCode, wParam, lParam);
    }
  }
}
' -ReferencedAssemblies System.Windows.Forms

while ($true) {
    $key = [System.Windows.Forms.Keys][KeyLogger.Program]::WaitForKey()
    if ($key -eq "X") {
        Write-Host "Do something now."
    }
}

版本2

(使用回调):

Add-Type -TypeDefinition '
  using System;
  using System.IO;
  using System.Diagnostics;
  using System.Runtime.InteropServices;
  using System.Windows.Forms;

  namespace PowerShell {
    public static class KeyLogger {
      private const int WH_KEYBOARD_LL = 13;
      private const int WM_KEYDOWN = 0x0100;

      private delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);

      private static Action<Keys> keyCallback;
      private static IntPtr hookId = IntPtr.Zero;

      [DllImport("user32.dll")]
      private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

      [DllImport("user32.dll")]
      private static extern bool UnhookWindowsHookEx(IntPtr hhk);

      [DllImport("user32.dll")]
      private static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hMod, uint dwThreadId);

      [DllImport("kernel32.dll")]
      private static extern IntPtr GetModuleHandle(string lpModuleName);

      public static void Run(Action<Keys> callback) {
        keyCallback = callback;
        hookId = SetHook();
        Application.Run();
        UnhookWindowsHookEx(hookId);
      }

      private static IntPtr SetHook() {
        IntPtr moduleHandle = GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName);
        return SetWindowsHookEx(WH_KEYBOARD_LL, HookCallback, moduleHandle, 0);
      }

      private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam) {
        if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN) {
          var key = (Keys)Marshal.ReadInt32(lParam);
          keyCallback(key);
        }
        return CallNextHookEx(hookId, nCode, wParam, lParam);
      }
    }
  }
' -ReferencedAssemblies System.Windows.Forms

[PowerShell.KeyLogger]::Run({
  param($key)
  if ($key -eq "X") {
    Write-Host "Do something now."
  }
})

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