Technical facts

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.9.2

Libraries used:

STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppQGraphicsViewExample2/CppQGraphicsViewExample2.pro


include(../../DesktopApplication.pri)



SOURCES += qtmain.cpp \

    grabber.cpp



HEADERS += \

    grabber.h

./CppQGraphicsViewExample2/grabber.h


#ifndef GRABBER_H

#define GRABBER_H



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#pragma GCC diagnostic ignored "-Wunused-but-set-parameter"

#include <QObject>

#pragma GCC diagnostic pop



struct Grabber : public QObject

{

  Q_OBJECT



  public:

  Grabber(

    const int win_id,

    const std::string& filename = "screengrab.png"

  );

  ~Grabber() noexcept;



  public slots:

  void Grab() const noexcept;



  private:

  const std::string m_filename;

  const int m_win_id;

};



#endif // GRABBER_H

./CppQGraphicsViewExample2/grabber.cpp


#include "grabber.h"



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#pragma GCC diagnostic ignored "-Wunused-but-set-parameter"

#include <QImage>

#include <QPixmap>

#pragma GCC diagnostic pop



Grabber::Grabber(

  const int win_id,

  const std::string& filename

)

  : m_filename{filename},

    m_win_id{win_id}

{



}



Grabber::~Grabber() noexcept {}



void Grabber::Grab() const noexcept

{

  const QImage screenshot{QPixmap::grabWindow(m_win_id).toImage()};

  screenshot.save(m_filename.c_str());

}

./CppQGraphicsViewExample2/qtmain.cpp


#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#pragma GCC diagnostic ignored "-Wunused-but-set-parameter"

#include <QApplication>

#include <QGraphicsView>

#include <QGraphicsSimpleTextItem>

#include <QTimer>

#include "grabber.h"

#pragma GCC diagnostic pop







int main(int argc, char *argv[])

{

  QApplication a(argc, argv);

  QGraphicsScene s;

  QGraphicsSimpleTextItem t;

  t.setText("To be grabbed...");

  t.setFlags(

      QGraphicsItem::ItemIsSelectable

    | QGraphicsItem::ItemIsMovable);



  s.addItem(&t);

  QGraphicsView v(&s);

  v.setGeometry(100,100,400,100);

  v.show();



  Grabber g(

    v.winId(),

    "CppQGraphicsViewExample2Screengrab.png"

  );

  QTimer::singleShot(1000,&g,SLOT(Grab()));



  return a.exec();

}

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(C++) QGraphicsViewExample2

Technical facts

Qt project file: ./CppQGraphicsViewExample2/CppQGraphicsViewExample2.pro

./CppQGraphicsViewExample2/grabber.h

./CppQGraphicsViewExample2/grabber.cpp

./CppQGraphicsViewExample2/qtmain.cpp