[Qt-interest] Grab the desktop on Mac

[Irfan Omair]

This is surprizing, as this works great for me.

If you are doing a lot of things in the application before you are
taking the screen shot, you could try to call
QApplication::processEvents() to clear out any events before you try to
capture the screen.

Is there some way to verify that the value returned by
FmApplication::desktop()->winId() is valid?
can you try this example and see if this works for you.
#include <QtGui>
class MyWidget: public QWidget
{
    Q_OBJECT

public:
    MyWidget(QWidget *parent = 0);

private slots:
   void doSomething();

private:
    QHBoxLayout *layout;
    QPushButton *button;
};
MyWidget::MyWidget(QWidget *parent)
: QWidget(parent)
{
    setWindowTitle("Support Tester");
    layout = new QHBoxLayout;
    button = new QPushButton ("Do Something");
    layout->addWidget(button);

    setLayout(layout);

    QObject::connect(button, SIGNAL(clicked()),
                     this, SLOT(doSomething()));
}
void MyWidget::doSomething()
{
    qDebug("something clicked");

       QPixmap  the_pixmap1 =
QPixmap::grabWindow(QApplication::desktop()->winId());
      the_pixmap1.save("test1.png");
    //
       QPixmap the_pixmap = QPixmap::grabWidget(QApplication::desktop());
        the_pixmap.save("test2.png");

}
#include "main.moc"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MyWidget *myWin = new MyWidget();
    myWin->show();
    return app.exec();
}


On Fri, Aug 6, 2010 at 9:01 AM, simion ploscariu <simion314 at gmail.com>wrote:

> Hi, i am trying to grab a pixmap with the desktop on Mac
>  QPixmap pixmap= QPixmap::grabWindow(QApplication::desktop()->winId());;
>    if(pixmap.isNull())
>    {
>        qDebug("QPixmap::grabWindow(QApplication::desktop()->winId());;
>  -returned a null image");
>    }
>
> and the pixmap is null.
> Any idea? Thx
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> Qt-interest at trolltech.com
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