qpushbutton clicked connect c++

In C++, the QPushButton class provides a button widget that can be clicked by the user. The connect function is used to establish a connection between the button's clicked signal and a slot, which is a function or method that will be executed when the button is clicked.

Here are the steps to connect a QPushButton's clicked signal to a slot in C++:

  1. Create a QPushButton object: First, you need to create an instance of the QPushButton class. This can be done by declaring a variable of type QPushButton and initializing it with the constructor. For example:
QPushButton* button = new QPushButton("Click me");
  1. Define a slot function: Next, you need to define a function that will be executed when the button is clicked. This function is referred to as the slot. Slots can be regular member functions or static member functions. For example:
void MyWidget::onButtonClicked()
    // Do something when the button is clicked
  1. Connect the clicked signal to the slot: Finally, you can establish the connection between the button's clicked signal and the slot function using the connect function. The connect function takes three arguments: the sender object (in this case, the button), the signal (in this case, the clicked signal), and the receiver object (in this case, the object that defines the slot function). For example:
QObject::connect(button, &QPushButton::clicked, this, &MyWidget::onButtonClicked);

In this example, the button is the sender object, QPushButton::clicked is the signal, this is the receiver object (assuming the slot function is a member function of the same class), and MyWidget::onButtonClicked is the slot function.

Once the connection is established, the slot function will be called whenever the button is clicked.

Note: It is important to ensure that the signal and slot have the same number and types of arguments. If they don't match, the compiler will generate an error. Additionally, make sure to include the necessary header files for the QPushButton and QObject classes.