Pen Movement Is Not Registering
On Windows, Qt relies on the Wintab32.dll, which is installed as part of the Wacom Tablet Driver. Ensure that you have the Wacom Tablet Driver installed and the tablet is functioning normally before attempting to capture Pen movements in Qt.
What Tablet Features Are Supported By Qt?
Generally speaking, Pen and Touch are supported. You can discover more about Pen and Touch on Qt's website.
Are ExpressKeys, Touch Rings, or Touch Strips Supported By Qt?
No. For ExpressKeys, Touch Ring, and Touch Strips, you will need to use the Tablet Controls Wintab Extensions (see the Wintab Tablet Controls for an example).
Can I control if Qt opens Wintab?
Yes. To do this though, you must build QT from source with the following defined:
Official Qt FAQs
There are a number of FAQ sections on Qt's website. The following are two helpful examples: