using sender() in a namespace

kocka

I have created a namespace, there is no class in there, there are some function in that namespace. I would like to use the following code:

QPushButton* button = (QPushButton*)sender();
QString buttonStr = button->text();

I am getting this error:

error: use of undeclared identifier 'sender'

If I using the code in the mainwindow.cpp file, there is no problem in there.

JonB

@kocka
If you want to pass the button text to a slot use b->text() in the lambda, or even pass b like you pass lineEdit, but don't use sender() in the slot.

I have no idea about your namespace stuff.

mrjj

Hi
You cant use sender() from a free function.
Has to be part of QObject.
https://doc.qt.io/qt-5/qobject.html#sender

Can you show more of what you are trying as maybe you can use a c++ lambda?

kocka

@mrjj

There are couple of QPushButton and I get the PushButton text and add that text to QLineEdit.

void getInput(QLineEdit* lineEdit) {

    QString textBoxStr =lineEdit->text();

    QPushButton* button = (QPushButton*)sender();
    QString buttonStr = button->text();

    textBoxStr += buttonStr;
    lineEdit->setText(textBoxStr);

}

In the mainwindow constructor I create and connect the push buttons with getInput function using the following code:

QList<QPushButton*> listFrameGetInput = frameGetInput->findChildren<QPushButton*>();
foreach(QPushButton* b, listFrameGetInput )
       connect(b, &QPushButton::clicked, this, [=]{names::getInput(lineEdit);});

When I create the push buttons I add them to a QFrame.

I just want to get the button text in the getInput function

kocka

Each namespace element was in the mainwindow.h/cpp, and the code executed well, now I would like to rearrange a little bit so I copy it to a namespace, maybe this is not the best idea, but I would like to do this way.

JonB

@kocka
If you want to pass the button text to a slot use b->text() in the lambda, or even pass b like you pass lineEdit, but don't use sender() in the slot.

I have no idea about your namespace stuff.