How to take snapshot in Qt

Article Metadata

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Tested with

Devices(s): S60 Emulator

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Compatibility

Platform(s): S60 5th Edition

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Article

Keywords: QFile,QPixmap

Created: (17 Jul 2009)

Last edited: valderind4 (16 Sep 2009)

OverView

This is a snapshot application in Qt which grabs the window and make a photo snap of it.Here the pixmap allow you to grab the whole window. you can save this as a new jpg image.

Preconditions

• Download the latest Qt for S60 distribution from Qt.
• Install Qt for S60:Installing Qt on S60
• Check this link for installation guide: How to install the package.
• Go through this article: Getting started with Qt for S60

Sourcecode

Header File

#ifndef SHOOT_H
#define SHOOT_H
 
#include <QtGui/QWidget>
#include<QPushButton>
#include<QFileDialog>
#include<QLabel>
#include<QFile>
#include<QDir>
#include<QDesktopWidget>
#include<QVBoxLayout>
#include<QPixmap>
class shoot : public QWidget
{
    Q_OBJECT
 
public:
    shoot(QWidget *parent = 0);
    ~shoot();
private slots:
    void shotscreen();
    void saveScreen();
private:
    void updateLabel();
    QPixmap originalPixmap;
    QVBoxLayout *lay;
    QLabel *pixmap;
    QPushButton *shootin;
    QPushButton *save;
    QPushButton *quit;
};
 
#endif // SHOOT_H

Source File

#include "shoot.h"
#include "ui_shoot.h"
 
shoot::shoot(QWidget *parent)
    : QWidget(parent)
{
        pixmap = new QLabel(this);
     pixmap->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding);
    pixmap->setAlignment(Qt::AlignCenter);
    pixmap->setMinimumSize(240, 160);
    shootin=new QPushButton("shoot",this);
    save=new QPushButton("Save",this);
    quit=new QPushButton("Quit",this);
    connect(shootin,SIGNAL(clicked()),this,SLOT(shotscreen()));
    connect(save,SIGNAL(clicked()),this,SLOT(saveScreen()));
    connect(quit,SIGNAL(clicked()),qApp, SLOT(quit()));
    lay=new QVBoxLayout(this);
    lay->addWidget(pixmap);
    lay->addWidget(shootin);
    lay->addWidget(save);
    lay->addWidget(quit);
    setLayout(lay);
    showMaximized();
    setStyleSheet("* { background-color:rgb(0,0,0);color:rgb(255,100,50); padding: 7px}}");
}
 
shoot::~shoot()
{
    // No need to delete any object that has got a parent which is properly deleted.
}
void shoot::saveScreen()
 {
     QString format = "png";
     QString initialPath = QDir::currentPath() + tr("/untitled.") + format;
 
     QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),initialPath,tr("%1 Files (*.%2);;All Files (*)").arg(format.toUpper()).arg(format));
     if (!fileName.isEmpty())
         originalPixmap.save(fileName, format.toAscii());
 }
void shoot::shotscreen()
{
     originalPixmap = QPixmap::grabWindow(QApplication::desktop()->winId());
     qApp->beep();
     updateLabel();
}
 void shoot::updateLabel()
 {
     pixmap->setPixmap(originalPixmap.scaled(pixmap->size(), Qt::KeepAspectRatio,Qt::SmoothTransformation));
 
 }

Screenshot

Zip file

Snapshot.zip