[Interest] QFileDialog: what's wrong with this minimal example

[Wilhelm]

Am 22.01.2013 19:46, schrieb nikita baryshnikov:
> Hi
>
> #include  <QtWidgets/QApplication>
>
> #include  <QtWidgets/QFileDialog>
>
>
> int  main(int  argc,  char  *argv[])
>
> {
>
>       QApplication  app(argc,  argv);
>
>       QFileDialog  fd(0,  "Load  from  file",  QDir::currentPath(),  "All  Files  (*)");
>
> //      fd.exec();
>
> //      return  app.exec();
>
> }
>
>
> works good for mewithout any error:(

which qt version, which compiler / version did you use?

>
>
>
> On Mon, Jan 21, 2013 at 9:41 PM, Wilhelm <wilhelm.meier at fh-kl.de
> <mailto:wilhelm.meier at fh-kl.de>> wrote:
>
>     Am 21.01.2013 19:36, schrieb Jason H:
>      > Looks ok. But try calling a.exec() and using a singleshot zero
>     timeout
>      > timer (beforr a.exec()) to bring up the file dialog. Let us know
>     if that
>      > works.
>
>     That all works. I stripped down the example to bring only the run-time
>     error. Looks like a Qt5-error, because the error doesn't show up in Qt
>     4.8.3. e.g.
>
>     I tries various g++ versions witg Qt5, but the run-time error remains.
>
>     Any Qt5 hints?
>
>      >
>      >
>      >
>      >
>     ------------------------------------------------------------------------
>      > *From:* Wilhelm <wilhelm.meier at fh-kl.de
>     <mailto:wilhelm.meier at fh-kl.de>>
>      > *To:* Qt Interest <interest at qt-project.org
>     <mailto:interest at qt-project.org>>
>      > *Sent:* Monday, January 21, 2013 1:33 PM
>      > *Subject:* [Interest] QFileDialog: what's wrong with this minimal
>     example
>      >
>      > Hi all,
>      >
>      > if I compile this stripped down minimal example
>      > -------------
>      > #include <QApplication>
>      > #include <QFileDialog>
>      >
>      > int main(int argc, char *argv[])
>      > {
>      >      QApplication a(argc, argv);
>      >      QFileDialog fd(0, "Load from file",
>      >                      QDir::currentPath(),
>      >                      "All Files (*)");
>      >
>      >      //    return a.exec();
>      > }
>      > ---------------
>      >
>      > I get the following run-time error:
>      >
>      > QObject: Cannot create children for a parent that is in a
>     different thread.
>      > (Parent is QFileSystemWatcher(0x1770be0), parent's thread is
>      > QThread(0x1734420), current thread is QFileInfoGatherer(0x1791c58)
>      >
>      >
>      > It is compiled with QT5.0.0 and g++ (GCC) 4.8.0 20130113
>     (experimental):
>      >
>      > make[2]: Entering directory
>      >
>     `/home/lmeier/Software/qtwm/trunk/apps/apps5-build-QT5-Debug/test/test4'
>      > g++ -c -m64 -pipe -g -Wall -W -D_REENTRANT -fPIE -DQT_WIDGETS_LIB
>      > -DQT_GUI_LIB -DQT_CORE_LIB
>      > -I/opt/Qt5.0.0/5.0.0/gcc_64/mkspecs/linux-g++-64
>      > -I../../../apps5/test/test4 -I/opt/Qt5.0.0/5.0.0/gcc_64/include
>      > -I/opt/Qt5.0.0/5.0.0/gcc_64/include/QtWidgets
>      > -I/opt/Qt5.0.0/5.0.0/gcc_64/include/QtGui
>      > -I/opt/Qt5.0.0/5.0.0/gcc_64/include/QtCore -I. -I. -o main.o
>      > ../../../apps5/test/test4/main.cc
>      > make[1]: Entering directory
>      > `/home/lmeier/Software/qtwm/trunk/apps/apps5-build-QT5-Debug/lib'
>      > make[1]: Nothing to be done for `first'.
>      > make[1]: Leaving directory
>      > `/home/lmeier/Software/qtwm/trunk/apps/apps5-build-QT5-Debug/lib'
>      > g++ -m64 -Wl,-rpath,/opt/Qt5.0.0/5.0.0/gcc_64
>      > -Wl,-rpath,/opt/Qt5.0.0/5.0.0/gcc_64/lib -o test4 main.o
>      > -L/usr/X11R6/lib64 -L/opt/Qt5.0.0/5.0.0/gcc_64/lib -lQt5Widgets
>     -lQt5Gui
>      > -lQt5Core -lGL -lpthread
>      >
>      > --
>      > Wilhelm
>      >
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>      >
>      >
>
>
>     --
>     Wilhelm
>
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>


-- 
Wilhelm