must construct QApplication before constructing QPaintDevice

[regix]

Hi,

I am making a simple testproject and I get this message when I run the project wich compiled fine.

Must construct a QApplication before a QPaintDevice

In the code you can see that I construct a QApplication before anything else.

????

regix Archief.tar.bz2

[Brandybuck]

You have a static ImageToHtml object (last line of testcodec.cpp). Static objects are created before the main() function is entered. Since ImageToHtml is a widget (a paint device), it gets created before QApplication.

That last line is useless. Is it a typo?

[regix]

Thanks,

I must have been blind to not see that.
Probably it was not visible in the editor I was using.
thanks anyway.

regix

[dvmorris]

Is there anything else that can cause this error?

I am using this bash script (http://qtcentre.org/forum/f-qt-progr...ighlight=qtxml) which embeds 4 Qt frameworks into the app and makes it into a dmg file, and once I do that, I receive this error. Before I embed the frameworks I do not get this error.

I can't seem to find any other reason why it would be caused. If anyone has any ideas let me know.
thanks for the help,
dave

[wysota]

You surely have some global object somewhere which is created before QApplication.

[dvmorris]

so that means that it must be outside of any class definition? I really can't find it. Why would it work before embedding the frameworks though?

[wysota]

I have no idea. I don't even know why you use that script. AFAIK Qt can create bundles by itself.

[dvmorris]

I've never seen anything on the Qt documentation about making dmg's. I found the script here originally:

http://qtnode.net/wiki/Distributing_Mac_Qt_applications

The script even says the guy who created it doesn't use it anymore, but I've never found a better way to do it. Do you have any suggestions. All I really need it for is to embed the QtCore, QtXml, QtOpenGL, and QtGui frameworks into my .app.

[wysota]

http://doc.trolltech.com/latest/deployment-mac.html

Anyway that's not the issue here. There is something wrong with your code.

[dvmorris]

I really don't see anything wrong with it. Will it definitely have the word static in it? The code is way too large to post up here, so I guess I'll just keep looking. I don't understand why it works with the absolute paths to the libraries, but not with the relative paths.

One thing I noticed that this script does that seems strange is in the results of

otool -L

before the script

/Library/Frameworks/Python.framework/Versions/2.5/Python (compatibility version 2.5.0, current version 2.5.0)
        /Library/Frameworks/3DconnexionClient.framework/Versions/A/3DconnexionClient (compatibility version 1.0.0, current version 1.0.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtXml.framework/Versions/4/QtXml (compatibility version 4.3.0, current version 4.3.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtOpenGL.framework/Versions/4/QtOpenGL (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime (compatibility version 1.0.0, current version 12.0.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtGui.framework/Versions/4/QtGui (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 128.0.0)
        /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 824.42.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtCore.framework/Versions/4/QtCore (compatibility version 4.3.0, current version 4.3.0)
        /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.3.6)
        /usr/lib/libiconv.2.dylib (compatibility version 5.0.0, current version 5.0.0)
        /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 22.0.0)
        /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
        /System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

/Library/Frameworks/Python.framework/Versions/2.5/Python (compatibility version 2.5.0, current version 2.5.0)
        /Library/Frameworks/3DconnexionClient.framework/Versions/A/3DconnexionClient (compatibility version 1.0.0, current version 1.0.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtXml.framework/Versions/4/QtXml (compatibility version 4.3.0, current version 4.3.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtOpenGL.framework/Versions/4/QtOpenGL (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime (compatibility version 1.0.0, current version 12.0.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtGui.framework/Versions/4/QtGui (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 128.0.0)
        /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 824.42.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtCore.framework/Versions/4/QtCore (compatibility version 4.3.0, current version 4.3.0)
        /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.3.6)
        /usr/lib/libiconv.2.dylib (compatibility version 5.0.0, current version 5.0.0)
        /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 22.0.0)
        /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
        /System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

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after the script

/Library/Frameworks/Python.framework/Versions/2.5/Python (compatibility version 2.5.0, current version 2.5.0)
        /Library/Frameworks/3DconnexionClient.framework/Versions/A/3DconnexionClient (compatibility version 1.0.0, current version 1.0.0)
        @executable_path/../Frameworks/QtXml.framework/Versions/4/QtXml (compatibility version 4.3.0, current version 4.3.0)
        @executable_path/../Frameworks/QtOpenGL.framework/Versions/4/QtOpenGL (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime (compatibility version 1.0.0, current version 12.0.0)
        @executable_path/../Frameworks/QtGui.framework/Versions/4/QtGui (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 128.0.0)
        /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 824.42.0)
        @executable_path/../Frameworks/QtCore.framework/Versions/4/QtCore (compatibility version 4.3.0, current version 4.3.0)
        /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.3.6)
        /usr/lib/libiconv.2.dylib (compatibility version 5.0.0, current version 5.0.0)
        /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 22.0.0)
        /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
        /System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

/Library/Frameworks/Python.framework/Versions/2.5/Python (compatibility version 2.5.0, current version 2.5.0)
        /Library/Frameworks/3DconnexionClient.framework/Versions/A/3DconnexionClient (compatibility version 1.0.0, current version 1.0.0)
        @executable_path/../Frameworks/QtXml.framework/Versions/4/QtXml (compatibility version 4.3.0, current version 4.3.0)
        @executable_path/../Frameworks/QtOpenGL.framework/Versions/4/QtOpenGL (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime (compatibility version 1.0.0, current version 12.0.0)
        @executable_path/../Frameworks/QtGui.framework/Versions/4/QtGui (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 128.0.0)
        /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 824.42.0)
        @executable_path/../Frameworks/QtCore.framework/Versions/4/QtCore (compatibility version 4.3.0, current version 4.3.0)
        /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.3.6)
        /usr/lib/libiconv.2.dylib (compatibility version 5.0.0, current version 5.0.0)
        /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 22.0.0)
        /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
        /System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

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saying @executable_path seems wrong, but I don't really know enough about it to know whether that's right or not.

[wysota]

No, the object doesn't have to be static. It's enough if it's global. Maybe your Qt installation is somehow broken?