Writing JSON data to a text file

Since we have learned how to process data obtained from a JSON file in the previous recipe, we will move on to learning how to save data to a JSON file. We will continue with the previous example and add to it.

How to do it…

We will learn how to save data in a JSON file through the following steps:

1. Add another button to mainwindow.ui, then set its object name as saveJsonButton and its label as Save JSON:

Figure 10.4 – Adding the Save JSON button

2. Right-click on the button and select Go to slot…. A window will pop up with a list of signals available for selection. Select the clicked() option and click OK. A signal function called on_saveJsonButton_clicked() will now be automatically added to both your mainwindow.h and mainwindow.cpp files by Qt:

Figure 10.5 – Selecting the clicked() signal and pressing OK

3. Add the following code to the...