Instantiate QWidget in QCoreApplication

[rrk13]

Is there any way I can instantiate a QWidget in a QCoreApplication? I do not want to show this widget, but just want to paint the widget to a png. I need to instantiate the widget, and then call QPixmap::grabWidget().

I cannot change this from QCoreApplication to QApplication. Are there any other ideas?

[UndeadBlow]

Hello. There is no way, as I know, to instantiate QWidget in QCoreApplication, but you can grab hidden widget without show that.
Code and it's execution for example:
@#include <QtGui>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QLabel *hello = new QLabel("Hello Qt Forum!");
QPixmap m = QPixmap::grabWidget(hello);
m.save("C:\Users\1\Desktop\1.png", "png");
return a.exec();
}@
Result:
!http://s43.radikal.ru/i099/1304/8e/1dd6fcff3b1e.png!

[utcenter]

I don't think QCoreApplication provides the functionality needed to maintain a GUI. Technically it is possible to draw any widget on an off-screen surface but I don't know if that is possible without a QApplication.

[podsvirov]

Your application uses the Gui module in any case (class QPixmap for example).
Use the code above, but just do not show widgets.

bq. Code and it’s execution for example:
@
#include <QtGui>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QLabel *hello = new QLabel("Hello Qt Forum!");
QPixmap m = QPixmap::grabWidget(hello);
m.save("C:\Users\1\Desktop\1.png", "png");
return a.exec();
}
@