当我想通过键盘命令/快捷方式运行一个简单的脚本时，PowerShell 很慢。 有什么办法让它跑得更快？

Question

I don't have keys on my keyboard to adjust the brightness of my screen. So i made a simple script to increase or decrease the brightness by 10%:

Brightness up: $Brigthness = Get-Ciminstance -Namespace root/WMI -ClassName WmiMonitorBrightness | select -ExpandProperty CurrentBrightness $Brigthness = $Brigthness + 10 (Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,$Brigthness)

For reducing the brightness i replace the + by a -.

I saved these scripts as ps1 files and made a shortcut on my desktop to open these in powershell via a keyboard command: Ctrl Shift + for increasing and Ctrl Shift - for decreasing the brightness.

Now here's the problem: when i press the command on my keyboard it takes a while for powershell to start up and run the script. It takes about 5 seconds for my screen to actually change brightness.

Is there any way to adjust the script or something to let it run faster? Just like it would on a normal keyboard shortcut. Then it's almost instant.

I was thinking about already letting powershell run in the background so that it doensn't have to boot up first, but i have no idea how.

Thanks in advance. Really curious if there's a way.

What i did so far: $Brigthness = Get-Ciminstance -Namespace root/WMI -ClassName WmiMonitorBrightness | select -ExpandProperty CurrentBrightness $Brigthness = $Brigthness + 10 (Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,$Brigthness)

Saved this as ps1 in my documents file.

Made a shortcut on desktop linking to the file path and assigned Ctrl Shift + as a keyboard shortcut to run it in PowerShell.

Answer 1

• The startup cost of Windows PowerShell's CLI, powershell.exe , is significant.

• Even if you implement a custom PowerShell command server that keeps running and receives commands to execute through some IPC mechanism, you'll need some executable (and therefore launching of a new process ) that the shortcut file invokes, which must request the execution of the desired command from the command server.

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Therefore:

• Using a shortcut-key mechanism that relies on shortcut files ( *.lnk ) is invariably slow (though with an executable that has a low startup cost it may be fast enough, depending on the use case).

• Consider the following alternatives:

  • Use a dedicated scripting language such as AutoHotkey (AHK) , which offers fast, in-process shortcut-key commands based on a resident process.

    • For instance, here are two AHK scripts that may work for you: one based on WMI , and one based on calling the Windows API

  • Use a dedicated utility for adjusting monitor brightness that also supports shortcut keys (hotkeys):

    • For instance, Twinkle Tray .

Answer 2

If you'd like to use PowerShell you need to keep a script running continuously (or at least the console for you to enter commands).

If you don't like to have a console up and running all the time, you have to revert to some heavier methods involving running the script hidden and triggering on Windows key events or building a Systray tool with a menu...

It's quite possible, but involves a lot more coding then you might be prepared to do.