Hi, @WLOrion said in Introduction in Qwt: I didn't know this behavior of the Qwt Classes. This is nothing Qwt specific, it's part of the C++ basics. As for tutorial, there's a nice online book that is in German but the author claims that online translator should give you a good enough result in your own language.

Hi I think you action runs out of scope it seems to be local variable QAction actions[11]; and you take address of them so it does not copy but refernce inside the list listOfMenus[0].addAction(&actions[i]); but it looks to me like the actions[11]; lives in constructor and hence when Mainwindow is shown, they are all already deleted. Move the list to be a member of the class and see. Damn Pl45m4 beat me to it :)

Just replying to say I got it working 100% as I expected, while still registering my object as a singleton! I just added a Connections element to my QML code, with the singleton object as its target. Thank you for your help, @mrjj

hi @cc672012 you may have several problems, but the first one is that you assigned a 32bit compiler to a 64bit Qt version. That will not work.

You can take a look at the "Chip" class in the 40000 chips example. Or the classes in the Drag Drop Robot example. They don't use text, but the principles are the same.