Original Post
I gave my software for testing and someone told me that the mouse was jerky. I checked it, and it was truly moving jerkly along the XAxis, but along the YAxis it moved smoothly! So I recorded the DIDEVICEOBJECTDATA dwData once for the XAxis and once for the YAxis. The data on the YAxis was somthing like that: 22, 24, 22, 24, 24, 24, 24, 22 However, the data on the XAxis was somthing like this: 22, 24, 5, 24, 22, 22, 24, 5, 22, 24 Which explained the jerkiness. Do you have an idea why this happens? It is really weird. Actually now I notice it is a problem with my mouse. It is also jerky along the XAxis in windows. Do you also have this problem with your mouse? I have an old ball A4Tech mouse.