SplashScreen isn't displayed

[Salazaar]

Hi. I've got a problem. I've created splashscreen, timer to it, but have a problem. Splashscreen is not displayed when application starts. Here's the code from main.cpp:

#include <QApplication>
#include <QPlastiqueStyle>
#include <QSplashScreen>
#include <QTimer>
 #include "maker.h"
 #include "about.h"
 
 int main(int argc, char *argv[])
 {
     QApplication::setStyle ( new QPlastiqueStyle() );
     QApplication app(argc, argv);
     QPixmap pixmap(":new/prefix1/poker.png");
     QSplashScreen splash(pixmap);
 
 
      QTimer splashTimer;
 
      splashTimer.setSingleShot( true );
 
      splashTimer.setInterval( 4000 ); //4 seconds
 
     QObject::connect( &splashTimer, SIGNAL( timeOut() ), &splash, SLOT( close()) );
     splashTimer.start(); 
     splash.show();
 
     MainWindow MainWindow;
     MainWindow.show();
 
     return app.exec();
 }

#include <QApplication>
#include <QPlastiqueStyle>
#include <QSplashScreen>
#include <QTimer>
 #include "maker.h"
 #include "about.h"

 int main(int argc, char *argv[])
 {
     QApplication::setStyle ( new QPlastiqueStyle() );
     QApplication app(argc, argv);
     QPixmap pixmap(":new/prefix1/poker.png");
     QSplashScreen splash(pixmap);
     
        
      QTimer splashTimer;
  
      splashTimer.setSingleShot( true );
  
      splashTimer.setInterval( 4000 ); //4 seconds
  
     QObject::connect( &splashTimer, SIGNAL( timeOut() ), &splash, SLOT( close()) );
     splashTimer.start(); 
     splash.show();

     MainWindow MainWindow;
     MainWindow.show();
     
     return app.exec();
 }

To copy to clipboard, switch view to plain text mode 

Of course I have this image in my resource file. What's wrong? Regards

[jpn]

Are you sure it doesn't show up? Something similar seems to show up for me. What if you make it on top:

QSplashScreen splash(pixmap, Qt::WindowStaysOnTopHint);

QSplashScreen splash(pixmap, Qt::WindowStaysOnTopHint);

To copy to clipboard, switch view to plain text mode 

Btw, there is a more convenient way for setting up a single shot timer:

QTimer::singleShot(4000, &splash, SLOT(close()));

QTimer::singleShot(4000, &splash, SLOT(close()));

To copy to clipboard, switch view to plain text mode 

[Salazaar]

Yes, I'm sure. I tried your code - without effect

[jpn]

In that case the problem must lie within the pixmap. Assure that the pixmap is not null, eg. QPixmap::isNull() returns false.

[Salazaar]

In docs I have short definition. How to use
bool QPixmap::isNull () const
Regards

[jpn]

In docs I have short definition. How to use
bool QPixmap::isNull () const

It's a member function of QPixmap. Call it the same way than you call QWidget::show() or QCoreApplication::exec(). The returned value indicates whether the pixmap has content or not. Showing a splash screen with null pixmap makes nothing to appear.

[Salazaar]

So I have to do something like this:

pixmap->isNull();

pixmap->isNull();

To copy to clipboard, switch view to plain text mode 

Yes?

[jpn]

Did you try to compile it? Variable pixmap is not a pointer so it would be pixmap.isNull(). Check the return value with a debugger or print it to debug output.

[Salazaar]

I placed this in main.cpp, and reached in console window:
QObject::connect: No such signal QTimer::timeout()
But even if there's no timeout() signal, it should show splash

[marcel]

Sure it's something wrong with pixmap.
Make sure you added the qrc to the project file and that you rebuild the project.

Regards

[fullmetalcoder]

Call QApplication::processEvents() after the splash.show()... and read the docs next time ... a QWidget can't appear before the application event loop starts running unless :

• It has an event loop of its own, just like QMessageBox
• You manually force events processing

If you want to display messages (or change the content of the splash in any way...) you'll have to call the same function after each change to allow propagation of show/hide/reisze/paint events...

[marcel]

You have in your code timeOut not timeout.
I'm sure console said the same.

Regards

[jpn]

Call QApplication::processEvents() after the splash.show()... and read the docs next time ...

Actually, processing pending events does not solve the problem. QCoreApplication::exec() is already called and the splash screen is shown by then, same time with the main window. It's just that the pixmap is not loaded correctly so no splash screen is shown either.

[jpn]

This seems to be a double thread. Please don't start new threads on exactly the same subject.

[marcel]

This seems to be a double thread. Please don't start new threads on exactly the same subject.

Yes, it seemed kind of familiar... The suggestions just came out, no thinking at all.

Anyway, Sal, loose the resource file and put the png somewhere accessible, like "c:\\image.png" ( this is to make sure you don't mess up the path ), and load the pixmap like this:

QPixmap pix = QPixmap( "c:\\image.png");

QPixmap pix = QPixmap( "c:\\image.png");

To copy to clipboard, switch view to plain text mode 

There is no room for mistakes here. If it still doesn't show, then try changing the window flags for the splash. But only if that doesn't work.

Regards

[fullmetalcoder]

t's just that the pixmap is not loaded correctly so no splash screen is shown either.

Good point! It might not be the problem here but AFAIK, by default, resources use UNIX-like path, i.e. there is a '/' at the begining...

[marcel]

Good point! It might not be the problem here but AFAIK, by default, resources use UNIX-like path, i.e. there is a '/' at the begining...

Yes, I guess this is it .
Well, this and actually compiling the qrc.

[Salazaar]

This is it. Now splash is displayed. So I have a wrong adress of image in resource file. Of course I have resource file included in my .pro file. But what's the correct adress of this image...hmm...

[jpn]

This is it. Now splash is displayed. So I have a wrong adress of image in resource file. Of course I have resource file included in my .pro file. But what's the correct adress of this image...hmm...

This is what I was trying to help you to realize yourself. It would be great help for you to learn, if not how to use debugger for now, but at least how to print informative messages to debug output.

[Salazaar]

D' you mean to use qDebug to see if pixmap.isNull() ?