API to change win10 touchpad 'cursor speed' dynamically without restarting

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We need to reduce touchpad cursor speed in certain state in our application. So, i was planning that when the application enter a specific state, we will change touchpad cursor speed at run time by using some Windows API. And when coming out of the specific state, revert the touchpad cursor speed to original value.

However, i did not find any Windows API to change touchpad 'Cursor speed' dynamically without restarting. I found API to change mouse speed (SystemParametersInfo). But this API only changes the mouse cursor speed. It does not change touchpad cursor speed.

I tried changing the below registry. But the problem with changing registry is that touchpad cursor speed gets updated only after system restart. I need an API to change touchpad cursor speed without restarting system (similar to how we can change mouse speed using SystemParametersInfo)

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\PrecisionTouchPad\CursorSpeed

Any suggestions in this regard will be really very helpful.

What I have tried:

I tried changing the below registry. But the problem with changing registry is that touchpad cursor speed gets updated only after system restart. I need an API to change touchpad cursor speed without restarting system (similar to how we can change mouse speed using SystemParametersInfo)

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\PrecisionTouchPad\CursorSpeed

Posted 19-Jul-18 7:03am

AroraSaurabh

Updated 19-Jul-18 9:45am

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Dave Kreskowiak 19-Jul-18 16:37pm

This is a bad idea. Changing the cursor speed and acceleration affects the mouse speed in EVERY application and window, not just your application.

That's a really bad change to make.

AroraSaurabh 19-Jul-18 22:52pm

Thanks for your feedback.
The application runs in a closed environment and no other Windows application can be accessed when our application is running. And also, within our application we want to reduce the cursor speed only for a specific state of the application and then revert to original when we come out.

The same is possible with mouse (using SystemParametersInfo API). However with touchpad, i don't find a way to do that.

Richard MacCutchan 20-Jul-18 3:53am

You already posted this in the C++ forum; please do not crosspost.

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Gerry Schmitz · Answer 1 · 2018-07-19T09:45:00

Microsoft seems pretty clear about what they expect from the experience; which is probably why they make it difficult to change "Windows Settings" on the fly.

One usually uses "input events" to "manage" input devices. When you detect movement, you can affect speed then by manipulating the mouse / cursor coordinates.

Handle pointer input - UWP app developer | Microsoft Docs[^]