@J.Hilk Thanks for your answer. But I want to ask how can I know I have to choose one over the another? After running the application "Bluetooth File Transfer" I faced the following error: Thanks in advance!

@Lasith Hi old type c array can also work. Its just a matter of what is registered already. You can register your own types. http://doc.qt.io/qt-5/qmetatype.html#Q_DECLARE_METATYPE

you can send the string to other class by simply placing it in the Signal, and catch the signal at the other class.

Oh ok, thanks to both of you! I think I am just going to make videos on it and show that without actually sending it. Thanks though!

@namit ok super.

@mrjj Com_Network is my own class which I use for Communication between Client and Server. Ok, I will give it a try.