Alan Ott

Which version? Using latest from git repo? Can you isolate which version this problem started in?

Do you have permissions to open the device? What platform are you on? Did you set the VID/PID in hidtest? It sounds like it works, if it works with test...

You can't open keyboards or mice on Windows using the platform HID library.

When you say you "don't buy" the inability of HIDAPI to open mice and keyboards in Windows.... the Windows platform HID functions won't allow you to talk to them using...

Well my library sits on top of those platform libraries. If you find something missing that your device needs, let me know. It's also possible that your device's software has...

Make sure you're using the latest from git (git clone). I don't know the answer for your device. See what stepping through the code with a debugger can tell you.

What is that supposed to tell me? Those look like two different devices.

I haven't seen anything that behaves like that, but you've given me very little information.

You might just be running into an issue with this use case on the mac. From what you're saying, either you can talk to the digitizer or the system can...

Vendor defined is what HIDAPI is designed for. Report ID's are not HID devices or interfaces. It's a different concept. See the HID specification.