从父级到子级QT传递QString

Question

I need in my program to get one QString from parent window to child window.

 menu=new user(this);  menu->show();

This is how I am creating child window. I have QString Username; declared in my parent called "login".

This is how I am trying to pass QString to my new window:

 QString loginnn=((login*)this->parent())->Username 

But I'm getting error:

"login was not declared in this scope"

Although I've included "login.h" file to my "user.h" file, and also "login" is marked in pink colour, and QT know what it is.

Thanks for any help!

Answer 1

The simplest solution would be to send a reference to the required string during your object construction

You should simply do this :

menu = new user(this, username);
menu->show();

Menu.cpp

class User
{
private:
     QString &_login;
public:
     User(..., QString &login):
       _login(login)
}

Now you should be able to use this string, which anyway would make sense to give during construction