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Hello yuan chen,
Thank you for posting in Q&A forum.
Because the question in this thread is related to Win32 API, I help you add the Windows API- Win32 tag. Then the engineers focus on the Win32 API will help you about this question.
https://learn.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-rawmouse
If you have any questions or concerns, please feel free to let us know.
Best Regards,
Daisy Zhou