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(C++) QtExample23

 

QtQt CreatorLubuntuUbuntu

 

This Qt example shows a way to grab a widget as an image.

 

Technical facts

 

Application type(s)

Operating system(s) or programming environment(s)

IDE(s):

Project type:

C++ standard:

Compiler(s):

Libraries used:

 

 

 

 

 

Qt project file: ./CppQtExample23/CppQtExample23.pro

 

exists(../../DesktopApplication.pri) {
  include(../../DesktopApplication.pri)
}
!exists(../../DesktopApplication.pri) {
  QT += core gui
  greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
  TEMPLATE = app

  CONFIG(debug, debug|release) {
    message(Debug mode)
  }

  CONFIG(release, debug|release) {
    message(Release mode)
    DEFINES += NDEBUG NTRACE_BILDERBIKKEL
  }

  QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra

  unix {
    QMAKE_CXXFLAGS += -Werror
  }
}

exists(../../Libraries/Boost.pri) {
  include(../../Libraries/Boost.pri)
}
!exists(../../Libraries/Boost.pri) {
  win32 {
    INCLUDEPATH += \
      ../../../Projects/Libraries/boost_1_55_0
  }
}

SOURCES += \
  main.cpp \
  grabmedialog.cpp
HEADERS  += grabmedialog.h
FORMS    += grabmedialog.ui

#CONFIG += mobility
#MOBILITY =
#symbian {
#    TARGET.UID3 = 0xe7eb3159
#    # TARGET.CAPABILITY +=
#    TARGET.EPOCSTACKSIZE = 0x14000
#    TARGET.EPOCHEAPSIZE = 0x020000 0x800000
#}

 

 

 

 

 

./CppQtExample23/grabmedialog.h

 

#ifndef GRABMEDIALOG_H
#define GRABMEDIALOG_H

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Weffc++"
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#include <QDialog>
#pragma GCC diagnostic pop

namespace Ui {
  class GrabMeDialog;
}

class GrabMeDialog : public QDialog
{
  Q_OBJECT

public:
  explicit GrabMeDialog(QWidget *parent = 0);
  GrabMeDialog(const GrabMeDialog&) = delete;
  GrabMeDialog& operator=(const GrabMeDialog&) = delete;
  ~GrabMeDialog();

private:
  Ui::GrabMeDialog *ui;

private slots:
  void on_button_grab_clicked();
};

#endif // GRABMEDIALOG_H

 

 

 

 

 

./CppQtExample23/grabmedialog.cpp

 

#include "grabmedialog.h"

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Weffc++"
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#include "ui_grabmedialog.h"
#pragma GCC diagnostic pop

GrabMeDialog::GrabMeDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::GrabMeDialog)
{
  ui->setupUi(this);
}

GrabMeDialog::~GrabMeDialog()
{
  delete ui;
}

void GrabMeDialog::on_button_grab_clicked()
{
  ui->label_image->setPixmap(
      QPixmap::grabWindow(this->winId()));

  //Other way:
  //QImage copy = QPixmap::grabWindow(this->winId()).toImage();
  //copy.save("temp.png");
  //ui->label_image->setPixmap(QPixmap("temp.png"));
}

 

 

 

 

 

./CppQtExample23/main.cpp

 

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Weffc++"
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#include <QApplication>
#include "grabmedialog.h"

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  GrabMeDialog w;
  w.show();
  return a.exec();
}

 

 

 

 

 

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