1. QPixmap QScreen::grabWindow(WId window,
2. int x = 0,
3. int y = 0,
4. int width = -1,
5. int height = -1)

QPixmap QScreen::grabWindow(WId window, 
                            int x = 0, 
                            int y = 0, 
                            int width = -1, 
                            int height = -1)

1. QScreen *screen = QGuiApplication::primaryScreen();
2. screen->grabWindow(0).save("screen_shot.jpg", "jpg"); // 0值为整个电脑屏幕WId

QScreen *screen = QGuiApplication::primaryScreen();
screen->grabWindow(0).save("screen_shot.jpg", "jpg"); // 0值为整个电脑屏幕WId

1. QPixmap QWidget::grab(const QRect &rectangle = QRect(QPoint(0, 0),
2. QSize(-1, -1)))

QPixmap QWidget::grab(const QRect &rectangle = QRect(QPoint(0, 0), 
                      QSize(-1, -1)))

1. QWidget widget;
2. widget.grab().save("screen_shot.jpg", "jpg");

QWidget widget;
widget.grab().save("screen_shot.jpg", "jpg");

1. #include <QApplication>
2. #include <QDesktopWidget>
3. #include <QScreen>
4. #include <QPixmap>
5. #include <QUuid>
6. #include <QDateTime>
8. int main(int argc, char *argv[])
9. {
10. QApplication a(argc, argv);
12. #if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
13. QPixmap pixmap = QPixmap::grabWindow(QApplication::desktop()->winId());
14. #else if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
15. QScreen *screen = QGuiApplication::primaryScreen();
16. QPixmap pixmap = screen->grabWindow(QApplication::desktop()->winId());
17. #endif
19. QString name = QString("%1-%2.png").
20. arg(QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss")).
21. arg(QUuid::createUuid().toString());
23. pixmap.save(name);
25. return 0;
26. }

#include <QApplication>
#include <QDesktopWidget>
#include <QScreen>
#include <QPixmap>
#include <QUuid>
#include <QDateTime>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
    QPixmap pixmap = QPixmap::grabWindow(QApplication::desktop()->winId());
#else if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
    QScreen *screen = QGuiApplication::primaryScreen();
    QPixmap pixmap = screen->grabWindow(QApplication::desktop()->winId());
#endif

    QString name = QString("%1-%2.png").
            arg(QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss")).
            arg(QUuid::createUuid().toString());

    pixmap.save(name);

    return 0;
}

1. QT += core
3. equals(QT_MAJOR_VERSION, 5) : QT += widgets
5. CONFIG -= app_bundle
6. TARGET = Screenshot
8. TEMPLATE = app
10. SOURCES += main.cpp

QT += core

equals(QT_MAJOR_VERSION, 5) : QT += widgets

CONFIG -= app_bundle
TARGET = Screenshot

TEMPLATE = app

SOURCES += main.cpp