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GeneralRe: CreateProcess lpApplicationName param Pin
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QuestionTechnical Interview Preparation Pin
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QuestionAPI to change win10 touchpad 'Cursor speed' dynamically without restarting Pin
AroraSaurabh19-Jul-18 6:59
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GeneralRe: API to change win10 touchpad 'Cursor speed' dynamically without restarting Pin
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AnswerRe: API to change win10 touchpad 'Cursor speed' dynamically without restarting Pin
Randor 20-Jul-18 21:30
professional Randor 20-Jul-18 21:30 
Member 9453331 wrote:
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.


If you need to restart the touchpad driver then you could probably use the Setupapi. I believe that you will need to first call SetupDiSetClassInstallParams with the SP_CLASSINSTALL_HEADER.InstallFunction set to DIF_PROPERTYCHANGE followed by a call to the SetupDiCallClassInstaller function with the DI_FUNCTION also set to DIF_PROPERTYCHANGE.

Be aware that many touchpad drivers are written by third-party vendor (i.e. not Microsoft). I don't think all touchpad drivers support being restarted from the Setup API. It really depends on how the third-party vendor has implemented their driver co-installer.

The Windows operating system is 'aware' of the co-installer capabilities from when the co-installer was registered. If you want to check if your touchpad supports enable/disable then go into the device manager and right click... if you see 'Disable Device' then that means that the co-installer supports device restart.

Believe it or not the touchpad device driver itself probably supports start/stop so there is nothing preventing you from developing a co-installer and registering it as the handler for the third-party touchpad driver as long as the co-installer DLL is not part of a digitally-signed catalog.

Best Wishes,
-David Delaune
QuestionRegistering a IOT Device in C++ Pin
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QuestionCChildFrame in separate thread Pin
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QuestionTrace a CString Pin
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