Qt - connecting in class - something wrong - this

Question

connect(from_file, SIGNAL(triggered()), MyQPlainTextEdit,
SLOT(on_pushButton_clicked()));

expected primary-expression before ',' token ..

Why this doesn't work? When I use this, it works (in my case this is MyQPlainTextEdit(0x20429230, name="plainTextEdit")), so why this doesn't work?

Because `MyPlainTextEdit` is a class, and you can't connect to a class, only to object. Also, it should be _pointer_ to object. In the case of `this`, it's right. — Michael, May 14 '17 at 08:51

score 0 · Answer 1 · answered May 14 '17 at 08:51

0

The receiver should be an object rather than class name.

So, the code should be:

MyQPlainTextEdit *edit = new MyQPlainTextEdit(this);
connect(from_file, SIGNAL(triggered()), edit, SLOT(on_pushButton_clicked()));

answered May 14 '17 at 08:51

Ziming Song

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He calls it from inside of MyQPlainTextEdit, so it's wrong. – Michael May 14 '17 at 08:53
if called from inside, the third parameter to `connect` should be `this`. – Ziming Song May 15 '17 at 11:34

Qt - connecting in class - something wrong - this

1 Answers1