This video is a continuation of the video: Learn to Create a Graphical Application with C++ and GTKmm.
We uploaded the files to GitHub and if you want to test it just do the following:
Watch the video
Below is a video that shows how to create a graphical application that will serve to export and import passwords from Firefox and save in GPG format. The video is in Brazilian Portuguese, enable subtitles to your language. The translations offers by Youtube Artificial Intelligence.