Invalid screen information

I've a program that needs to retrieve the name of available screens and it does not work on Windows.

My program uses a screen and a video projector. The operating system handles the video projector as a secondary screen. The video projector extends the display of the first one. Qt can give me the two screens but when I'm retrieving information like name or manufacturer I have useless information like display 1 and display 2.

I've the same result with a second setup made of laptop and a benq monitor. It does not work.

On MacOS X,  Qt gives me correct information.