Create Slpash Screen

[M4RZB4Ni]

Hi,
I want To Create A splash Screen for My Application
i wrote This Code But when i start app Instantly Viewed and THEN instantly
Non-View!
this is my code and what i must do to set show time off splash screed?

int main(int argc, char *argv[])
{
 QApplication app(argc, argv);
 QSplashScreen *splash = new QSplashScreen;
 splash->setPixmap(QPixmap(":/images/splash.png"));
 splash->show();
 Qt::Alignment topRight = Qt::AlignRight | Qt::AlignTop;
 splash->showMessage(QObject::tr("Setting up the main window..."),
 topRight, Qt::white);
 MainWindow mainWin;
 splash->showMessage(QObject::tr("Loading modules..."),
 topRight, Qt::white);
 loadModules();
 splash->showMessage(QObject::tr("Establishing connections..."),
 topRight, Qt::white);
 establishConnections();
 mainWin.show();
 splash->finish(&mainWin);
 delete splash;
 return app.exec();
}

[Ratzz]

Hi might be this,

    QApplication app(argc, argv);
    QPixmap pixmap(":/new/prefix1/Icons/SplashScreen.png");
    QSplashScreen splash(pixmap);
    splash.show();
    //This line represents the alignment of text, color and position
    splash.showMessage(QObject::tr("Initiating..."),Qt::AlignLeft, Qt::white);

    app.processEvents();
    Sleep(3000);

    MainWindow win;
    win.showMaximized();
    splash.finish(&win);
    return app.exec();

[xeggsy]

@M4RZB4Ni I think you probably just copied that code from: http://www.qtcentre.org/archive/index.php/t-45572.html. Even though that is not important it does indicate to me that you have not really searched for an answer on your own. Anyway, I would say the easiest way to see whether the splash screen is working properly (testing it) is by using the QTest namespace as follows:

#include "MyClass.h" // #include "MainWindow.h" in your case
#include <QtGui/QApplication>
#include <QSplashScreen>
#include <QTest> // The testing namespace

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	QSplashScreen *splash = new QSplashScreen; // May also be allocated on the stack instead
	splash->setPixmap(QPixmap(":MyClass/Resources/images/Qt Logo.png")); // Replace with a path to your own image
	splash->show();

	Qt::Alignment topRight = Qt::AlignRight | Qt::AlignTop;
	splash->showMessage(QObject::tr("Setting up the main window..."), topRight, Qt::white);
	QTest::qSleep(1000); // Sleeps the application for 1 second and blocks processing of events
	
	splash->showMessage(QObject::tr("Loading modules..."), topRight, Qt::white);
	MyClass myClass; // Is MainWindow win in your case
	QTest::qSleep(1000);
	//myClass.loadModules(); Have not implemented this function
	
	splash->showMessage(QObject::tr("Establishing connections..."), topRight, Qt::white);
	QTest::qSleep(1000);
	//myClass.establishConnections(); Idem

	myClass.show();
	splash->finish(&myClass);
	delete splash;
	
	return app.exec();
}

The calls to QTest::qSleep(1000) sleep the application for a 1000 milliseconds (no event processing). You can also replace it with QTest::qWait(1000) (with event processing). AFAIK there is no specific function that is part of the QSplashScreen library which you can use to set a display time for the splash screen.

If you always want to sleep the application for a few seconds to show the splash screen and thereby temporarily prevent the execution of the rest of your program then I would use @Ratzz method.

[VRonin]

splash->finish(&mainWin); does not block the main thread.
instead of calling delete splash; directly, use splash->setAttribute(Qt::WA_DeleteOnClose); (better if you set the attribute before calling show)

[M4RZB4Ni]

@xeggsy
tnx but your code show below error:
error: undefined reference to `_imp___ZN5QTest6qSleepEi'
what i must do?

[SGaist]

Hi,

Never use the QtTest module in production code. It's a framework for unit testing.

Out of curiosity, why do you want to slow down your application startup to show a splash screen ?

[M4RZB4Ni]

@SGaist
hi,
tnx but i just need a source code for splash screen
can you write a sample code for me please?

[SGaist]

This will give you the base to get started:

QSplashScreen splash(":/images/splash.png");
splash.show();
app.processEvents();
QEventLoop loop;
QTimer::singleShot(3000, &loop, &QEventLoop::quit);
loop.exec();
QWidget widget;
widget.show();
sps.finish(&widget);
return app.exec();

[M4RZB4Ni]

@SGaist
Thanks a lot :)