#include <QApplication>
#include <QDesktopWidget>
#include <QPixmap>

int main(int argc, char **argv) {
    QApplication app(argc, argv);
    for (int s = 0; s < QApplication::desktop()->screenCount(); ++s)
        QPixmap::grabWindow(QApplication::desktop()->screen(s)->winId()).save(QString("%0/desktop_%1.png").arg(QApplication::applicationDirPath()).arg(s));
    return 0;
}