Talking about how strange the current state of Windows API is, there are actually 3 different APIs that can move the mouse cursor: SetCursorPos [1], SendInput [2], and mouse_event [3].
Applications might react differently to input events generated by these APIs. For example, in Windows 11's display settings, the position of screens can not be dragged if input events are coming from SetCursorPos, but works fine if using SendInput. Microsoft's own PowerToys uses a mixture of both under certain (complex) conditions, but I never found out the actual difference between them.
I was writing an application that sends mouse input from a Linux machine to a Windows one (similar to Synergy), and I originally received mouse movement events that are accelerated (with user or system-defined acceleration factors), and I found out that there are no Windows API (three of them) that accepts relative movements without further acceleration (i.e. Windows will always apply further acceleration, making the mouse hard to use). I ended up directly hook into evdev to get raw mouse movements and let Windows accelerate them.
Applications might react differently to input events generated by these APIs. For example, in Windows 11's display settings, the position of screens can not be dragged if input events are coming from SetCursorPos, but works fine if using SendInput. Microsoft's own PowerToys uses a mixture of both under certain (complex) conditions, but I never found out the actual difference between them.
I was writing an application that sends mouse input from a Linux machine to a Windows one (similar to Synergy), and I originally received mouse movement events that are accelerated (with user or system-defined acceleration factors), and I found out that there are no Windows API (three of them) that accepts relative movements without further acceleration (i.e. Windows will always apply further acceleration, making the mouse hard to use). I ended up directly hook into evdev to get raw mouse movements and let Windows accelerate them.
[1] https://learn.microsoft.com/en-us/windows/win32/api/winuser/... [2] https://learn.microsoft.com/en-us/windows/win32/api/winuser/... [3] https://learn.microsoft.com/en-us/windows/win32/api/winuser/...