Use of undeclared identifier 'connect'

Christina123

Hi, I am having this error but having no clue of what causes it. I have two classes that inherits from QDialog and I try to connect them in the main.cpp. What I want to do here is simply that when a mouse is pressed in window dialog, it will triggers the receiverWindow to change the displayed text.

connect(&w, &window::mousePressEvent, &receiverWindow, &Receiver::text);

/*They are the errors that I receive*/
QObject::connect: signal not found in window
Use of undeclared identifier 'connect'

Chris Kawa

Two things here:

connect is a member of QObject, so if you're using it outside of that class, e.g. in the main() function you need to fully qualify it as QObject::connect.

mousePressEvent is, as the name suggests, an event, not a signal, so you can't use it in connect statement as such.

Christina123

@Chris-Kawa Thank you for point them out to me.