Question

I am new to Qt GUI programming and come from a .NET/Winforms background as far as GUI development goes. I am using the Qt Creator IDE.

How can I handle a button press event in Qt to do something like the following:

if (button.clicked = true)
{
    startProgram();
}

Also, how would I browse for a configuration file which would populate values into all of my line edit textboxes when opened? I am programming this in C++.

EDIT: I am taking a console app that someone else wrote and building a GUI around it. I want to access one of the functions in there from a button click event. However, I can’t figure out how to get the functions of the original app to be in scope of the GUI which I have created when I try to use SIGNALS and SLOTS.

Answer 1

In order to access the functions defined in the console application, you need to include the headers (.h/.hpp) that declare these functions, and link their implementation. I you have the source code of the implementations (.cpp), you need to add them to the sources to be compiled (they will be compiled in object files (.o) that will be linked in the final executable). If the console application is a front-end to a set of functions defined in a library (.lib, .a), you need to link this library.

After that, you can use Qt’s signal/slot mechanism to connect the “button clicked” signal to a slot calling the function you want to execute, as described in other answers.