Experimental Physics and
Industrial Control System

Jennings Guy <[email protected]> · Thu, 17 Oct 2013 10:44:35 -0500

Looking at the qt4 -> qt5 transition notes at http://qt-project.org/wiki/Transition_from_Qt_4.x_to_Qt5 it
would seem that there are changes in the plugin loading interface between qt4 and qt5 - perhaps this
is the cause of your problems

Guy Jennings

Addvanced Photon Source

On Oct 17, 2013, at 3:40 PM, "Alexander S. Aryshev" <[email protected]>
 wrote:

> Dear Emmanuel,
> 
> well... yes, you are correct. And it actually works well
> on Qt4 (we are using it now). Although I can not find any 
> reason why it should not work on Qt5. 
> 
> The changes I made to epicsqt in order to compile it under Qt5
> were very simple and could be divided onto a few categories:
> (unfortunately I did not made detailed changes log)
> 
> 1. In .pro files
> Line
> QT += widgets uitools
> was added
> All CONFIG were set to debug_and_release
> not sure if it was right thing to do.
> 
> 2. #include<>
> "QtGui" was replaced by "QtWidgets"
> etc.
> 
> 3. QWT functions
> A few lines related to "canvas line width" were just commented out.
> 
> 4. Qt functions
> toAscii()  -> toLatin1()
> 
> end of QEDesignerPlugin.cpp
> #if QT_VERSION < 0x050000
> Q_EXPORT_PLUGIN2( QEWidgetsPlugin, QEWidgets )
> #endif
> 
> and QEDesignerPlugin.h
> #if QT_VERSION >= 0x050000
> Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QDesignerCustomWidgetCollectionInterface" )
> #endif
> 
> 5. Environment variables
> #Qt
> export QTDIR=/usr/local/Qt-5.1.1
> export QTHOME=$QTDIR
> export PATH=$PATH:$QTDIR/bin
> export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:$QTDIR/lib"
> 
> #For GCC compilation and to resolve Qt GLIBCXX error 
> export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:/home/lucxopr/Distr/mpc-0.8.1/src/.libs"
> export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:/home/lucxopr/Distr/gcc-4.8.1/i686-pc-linux-gnu/libstdc++-v3/src/.libs"
> 
> #QWT
> export QWT_ROOT=/home/lucxopr/soft/QtTools/qwt-6.1.0
> export QWTHOME=$QWT_ROOT
> export QT_PLUGIN_PATH=${QWT_ROOT}/plugins/
> export QWT_INCLUDE_PATH=$QWT_ROOT/include
> export QWTDIR=$QWT_ROOT
> export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:$QWT_ROOT/lib"
> export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:$QWT_ROOT/include"
> export PATH=$PATH:$QWT_ROOT/include
> 
> #epicsqt
> export QT_PLUGIN_PATH="$QT_PLUGIN_PATH:/usr/local/Qt-5.1.1/plugins/designer"
> export PATH=$PATH:/home/lucxopr/soft/QtTools/epicsqt/applications/QEGuiApp
> export PATH=$PATH:/home/lucxopr/soft/QtTools/epicsqt/applications/QEMonitorApp
> export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/lucxopr/soft/QtTools/epicsqt/framework/designer
> export QT_PLUGIN_PATH="$QT_PLUGIN_PATH:/home/lucxopr/soft/QtTools/epicsqt/framework"
> export QCAFRAMEWORK=/home/lucxopr/soft/QtTools/epicsqt/framework
> 
> After that qmake gave me following output:
> 15:33:10: Running steps for project epicsqt...
> 15:33:10: Starting: "/usr/local/Qt-5.1.1/bin/qmake" /home/lucxopr/soft/QtTools/epicsqt/epicsqt.pro -r -spec linux-g++
> Reading /home/lucxopr/soft/QtTools/epicsqt/framework/framework.pro
> Project MESSAGE: Applications may need to load the framework library directly. To ensure this can happen one option is to set up LD_LIBRARY_PATH to include the directory <your-epicsqt-project-location>/framework/designer. LD_LIBRARY_PATH is currently :/usr/lib:/home/lucxopr/soft/epics/base-3.14.12.3/lib/linux-x86:/home/lucxopr/soft/epics/extensions/lib/linux-x86:/usr/lib/python2.6/site-packages/numpy/core/include/numpy/:/home/lucxopr/Distr/wxPython-src-2.9.3.1/bld/lib:/home/lucxopr/Distr/wxPython-src-2.9.3.1/bld/lib:/usr/local/Qt-5.1.1/lib:/home/lucxopr/Distr/mpc-0.8.1/src/.libs:/home/lucxopr/Distr/gcc-4.8.1/i686-pc-linux-gnu/libstdc++-v3/src/.libs:/home/lucxopr/soft/QtTools/qwt-6.1.0/lib:/home/lucxopr/soft/QtTools/qwt-6.1.0/include:/home/lucxopr/soft/QtTools/qcustomplot/sharedlib-compilation:/home/lucxopr/soft/QtTools/epicsqt/framework/designer
> Project MESSAGE: Applications may need to load the framework library as a Qt plugin. To ensure this can happen one option is to set up QT_PLUGIN_PATH to include the directory <your-epicsqt-project-location>/framework. QT_PLUGIN_PATH is currently /home/lucxopr/soft/QtTools/qwt-6.1.0/plugins/:/usr/local/Qt-5.1.1/plugins/designer:/home/lucxopr/soft/QtTools/epicsqt/framework
> Project WARNING: QE_ARCHIVE_LIST is not defined. That's OK, but if you want to be able to backfill QEStripChart widgets from
> Project WARNING: an archiver you should define this environment variable to be a space delimited list of your archiver URLs
> Project WARNING: For example: 'archiver.synchrotron.org.au:80/cgi-bin/ArchiveDataServer1.cgi archiver.synchrotron.org.au:80/cgi-bin/ArchiveDataServer2.cgi'
> Project WARNING: QE_ARCHIVE_LIST is not defined. That's OK, but if you want to be able to backfill QEStripChart widgets from
> Project WARNING: an archiver you should define this environment variable to be a space delimited list of your archiver URLs
> Project WARNING: For example: 'archiver.synchrotron.org.au:80/cgi-bin/ArchiveDataServer1.cgi archiver.synchrotron.org.au:80/cgi-bin/ArchiveDataServer2.cgi'
> Project WARNING: QE_ARCHIVE_LIST is not defined. That's OK, but if you want to be able to backfill QEStripChart widgets from
> Project WARNING: an archiver you should define this environment variable to be a space delimited list of your archiver URLs
> Project WARNING: For example: 'archiver.synchrotron.org.au:80/cgi-bin/ArchiveDataServer1.cgi archiver.synchrotron.org.au:80/cgi-bin/ArchiveDataServer2.cgi'
> Reading /home/lucxopr/soft/QtTools/epicsqt/applications/QEGuiApp/QEGuiApp.pro
> Reading /home/lucxopr/soft/QtTools/epicsqt/applications/QEMonitorApp/QEMonitorApp.pro
> 15:33:13: The process "/usr/local/Qt-5.1.1/bin/qmake" exited normally.
> 15:33:13: Elapsed time: 00:03.
> 
> ...and make gave the next output
> 
> 15:34:01: Running steps for project epicsqt...
> 15:34:01: Configuration unchanged, skipping qmake step.
> 15:34:01: Starting: "/usr/bin/make" -j 4
> cd framework/ && ( test -e Makefile || /usr/local/Qt-5.1.1/bin/qmake /home/lucxopr/soft/QtTools/epicsqt/framework/framework.pro -spec linux-g++ -o Makefile ) && /usr/bin/make -f Makefile 
> make[1]: Entering directory `/home/lucxopr/soft/QtTools/epicsqt/framework'
> /usr/bin/make -f Makefile.Release
> make[2]: Entering directory `/home/lucxopr/soft/QtTools/epicsqt/framework'
> 
> Skipping many output lines here...
> 
> widgets/QEImage/QEImage.cpp: In member function 'void QEImage::setImage(const QByteArray&, long unsigned int, QCaAlarmInfo&, QCaDateTime&, const unsigned int&)':
> widgets/QEImage/QEImage.cpp:687:31: warning: 'minBits' may be used uninitialized in this function [-Wmaybe-uninitialized]
>      elementsPerPixel = minBits/(imageDataSize*8);
> 
> Skipping many output lines...
> 
> 15:35:37: The process "/usr/bin/make" exited normally.
> 15:35:37: Elapsed time: 01:37.
> 
> Personally I suspect that I was not correct with Q_PLUGIN_METADATA
> and that is why the library can not be loaded...
> 
> Thanks a lot!
> 
> Cheers,
> Alex
> 
> 
> epicsqt is build on Qt4
> although the Qt4 to Qt5 migration should be simple, 
> I recommend you first try your installation on Qt4.
> 
> PS: I am not an epicsqt developer!
> --
> Emmanuel
> 
> > Date: Tue, 15 Oct 2013 19:35:16 -0700
> > From: [email protected]
> > To: [email protected]
> > Subject: epicsqt with Qt5.1.1, Qt-Creator 2.8.1
> > 
> > Dear QTi-talk,
> > 
> > I am trying to compile epicsqt 2.7.1 with
> > very standard installation of Qt5.1.1 and install
> > its plugin into designer under Qt-creator 2.8.1 on
> > Scientific Linux 6.4 (kernel 2.6.32-358.18.1.el6.i686).
> > 
> > The Creator itself was build from src under the same version of Qt.
> > The QWT version is 6.1.0. It was also build from src and seems
> > working ok (all examples are working fine).
> > 
> > EPICS base3.14.12.3 is installed and all env. variables are defined.
> > 
> > After all standard changes http://qt-project.org/wiki/Transition_from_Qt_4.x_to_Qt5
> > applied to epicsqt 2.7.1 it was built without any errors
> > (just warnings about QE_ARCHIVE_LIST is not defined).
> > After that I have defined QT_PLUGIN_PATH pointed to framework folder
> > where designer folder with libQEPlugin.so was.
> > 
> > Unfortunately this library always return
> > "Plugin verification data mismatch" on loading.
> > 
> > Does anyone had a similar problem and know how to solve it?
> > 
> > Below is a list of my environment.
> > 
> > With the best regards,
> > Alex
> > 
> > 
> > Qt 5.1.1 (Qt-5.1.1)
> > ABI: x86-linux-generic-elf-32bit
> > Source: /usr/local/Qt-5.1.1
> > mkspec: linux-g++
> > qmake: /usr/local/Qt-5.1.1/bin/qmake
> > Version: 5.1.1
> > QMAKE_SPEC linux-g++
> > QMAKE_VERSION 3.0
> > QMAKE_XSPEC linux-g++
> > QT_HOST_BINS /usr/local/Qt-5.1.1/bin
> > QT_HOST_DATA /usr/local/Qt-5.1.1
> > QT_HOST_LIBS /usr/local/Qt-5.1.1/lib
> > QT_HOST_PREFIX /usr/local/Qt-5.1.1
> > QT_INSTALL_ARCHDATA /usr/local/Qt-5.1.1
> > QT_INSTALL_BINS /usr/local/Qt-5.1.1/bin
> > QT_INSTALL_CONFIGURATION /usr/local/Qt-5.1.1/etc/xdg
> > QT_INSTALL_DATA /usr/local/Qt-5.1.1
> > QT_INSTALL_DEMOS /usr/local/Qt-5.1.1/examples
> > QT_INSTALL_DOCS /usr/local/Qt-5.1.1/doc
> > QT_INSTALL_EXAMPLES /usr/local/Qt-5.1.1/examples
> > QT_INSTALL_HEADERS /usr/local/Qt-5.1.1/include
> > QT_INSTALL_IMPORTS /usr/local/Qt-5.1.1/imports
> > QT_INSTALL_LIBEXECS /usr/local/Qt-5.1.1/libexec
> > QT_INSTALL_LIBS /usr/local/Qt-5.1.1/lib
> > QT_INSTALL_PLUGINS /usr/local/Qt-5.1.1/plugins
> > QT_INSTALL_PREFIX /usr/local/Qt-5.1.1
> > QT_INSTALL_QML /usr/local/Qt-5.1.1/qml
> > QT_INSTALL_TESTS /usr/local/Qt-5.1.1/tests
> > QT_INSTALL_TRANSLATIONS /usr/local/Qt-5.1.1/translations
> > QT_SYSROOT
> > QT_VERSION 5.1.1
> > 
> > gcc -v
> > Using built-in specs.
> > COLLECT_GCC=gcc
> > COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/i686-pc-linux-gnu/4.8.1/lto-wrapper
> > Target: i686-pc-linux-gnu
> > Configured with: ./configure
> > Thread model: posix
> > gcc version 4.8.1 (GCC) 
> > 
> 
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System