Parentheses expected, but code has sets of parentheses

[micha_eleric]

error:

QObject::connect: Parentheses expected, slot QMainWindow::CGUI::Btn_test_clicked in ../GUI/CGUI.cpp:2518
QObject::connect:  (sender name:   'pushButton_22')
QObject::connect:  (receiver name: 'MainWindow')
Press <RETURN> to close this window...

code at line 2518:

ui->pushButton_22->connect(ui->pushButton_22, SIGNAL (clicked()),this, SLOT (CGUI::Btn_test_clicked) );

is it complaining about somewhere else?

[JKSH]

@micha_eleric CGUI::Btn_test_clicked needs parentheses.

But anyway, the new syntax is more recommended nowadays: https://doc.qt.io/qt-5/signalsandslots-syntaxes.html

[micha_eleric]

@JKSH said in Parentheses expected, but code has sets of parentheses:

parentheses

????
looks like it has parentheses

[Kent-Dorfman]

SIGNAL and SLOT are macros. you should not put a space before their opening paren.

[micha_eleric]

@Kent-Dorfman said in Parentheses expected, but code has sets of parentheses:

SIGNAL and SLOT are macros. you should not put a space before their opening paren.

i removed spaces, and same errors

[Kent-Dorfman]

@micha_eleric See @JKSH response above.

[micha_eleric]

@Kent-Dorfman said in Parentheses expected, but code has sets of parentheses:

@micha_eleric See @JKSH response above.

i did, and i responded.

[JKSH]

@micha_eleric said in Parentheses expected, but code has sets of parentheses:

????
looks like it has parentheses

• clicked() <-- has parentheses
• CGUI::Btn_test_clicked <-- doesn't have parentheses

And did you read the link I gave you?

[micha_eleric]

@JKSH said in Parentheses expected, but code has sets of parentheses:

@micha_eleric said in Parentheses expected, but code has sets of parentheses:

????
looks like it has parentheses

• clicked() <-- has parentheses
• CGUI::Btn_test_clicked <-- doesn't have parentheses

And did you read the link I gave you?

thank you for the explanation.
and yes, i am reading the link you posted. got questions, trying to figure it out.

[JonB]

@micha_eleric
Your original, old-style should have read like this:

ui->pushButton_22->connect(ui->pushButton_22, SIGNAL(clicked()), this, SLOT(CGUI::Btn_test_clicked()) );

And the preferable, new-style equivalent would be:

ui->pushButton_22->connect(ui->pushButton_22, &QPushButton::clicked, this, &CGUI::Btn_test_clicked);

[micha_eleric]

@JonB

thank you. i was about half way there

[JKSH]

@micha_eleric said in Parentheses expected, but code has sets of parentheses:

thank you for the explanation.

You're most welcome.

and yes, i am reading the link you posted. got questions, trying to figure it out.

Feel free to post your questions here.