(C++) QtExample23

 

 

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

 

• Download the 'CppQtExample23' source code (zip)
• View a screenshot of 'CppQtExample23' (png)

Technical facts

 

Application type(s)

• Desktop application

Operating system(s) or programming environment(s)

• Lubuntu 15.04 (vivid)

IDE(s):

• Qt Creator 3.1.1

Project type:

• GUI application

C++ standard:

• C++11

Compiler(s):

• G++ 4.9.2

Libraries used:

• Qt: version 5.4.1 (32 bit)
• STL: GNU ISO C++ Library, version 4.9.2

 

 

 

 

 

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(); }