Hands-On GUI Programming with C++ and Qt5

Connecting to the camera

Here comes the most exciting part. We are going to learn how to access our camera(s) using Qt's multimedia module! First, open mainwindow.h and add the following headers:

#include <QMainWindow> 
#include <QDebug> 
#include <QCameraInfo> 
#include <QCamera> 
#include <QCameraViewfinder> 
#include <QCameraImageCapture> 
#include <QMediaRecorder> 
#include <QUrl> 

Next, add the following variable, as shown here:

private: 
   Ui::MainWindow *ui; 
   QCamera* camera; 
   QCameraViewfinder* viewfinder; 
   bool connected; 

Then, open up mainwindow.cpp and add the following code to the class constructor to initiate the QCamera object. We then use the QCameraInfo class to retrieve a list of connected cameras and fill in that information in the ...