General and Desktop

My behavior correction patch for this one has also gone through to be available in 6.0/the current dev build https://codereview.qt-project.org/c/qt/qtbase/+/312083 Cheers.

Some platforms (Android) have a native API for this. A rock-solid (and quite wasteful) solution for all platforms is to ping a well-known server like Google (or your own server if you have one) periodically. If the connection does not work, you know that there is no Internet access.

@kuzulis I follow your advice to check the device manager of Windows. Now the problem has gone. I don't know which part is the cause of the problem (maybe the error is eliminated because my computer restarts?) Nevertheless, my program runs well. Thank you for the help. @aha_1980 @jsulm @kuzulis

Hi Again , I solved the problem :: i had to remake the driver and after googling and looking in the forum many guys had the same problem with the actual driver and remaking new one. Here is how to do : I'm using Postgresql 10. 1. you need to download the zip file of postgresql where source code exist. 2. lunch the Qt Mingw console. 3. copy all the file exists in the include path of the download zip in %Path_TO_QT\src\qtbase\plugins\sqldrivers\psql ( if you don't you'll have problems with include files .h in mingw32-make 4. make sur to copy the lib files to the same folder psql ( libpq.dll , libeay32.dll, libintl , libiconv, ssleay32.dll ) ssleay32 you can have i from the net ( i got it from my xampp folder) 5. edit the file psql.pro and comment : QMAKE_USE += psql with a # if you don't you'll have error : psql model not defined 6. run the qmake command as follow: qmake "INCLUDEPATH+=PATH_TO_DOWNLOAD_SOURCE\pgsql\include" "LIBS+=PATH_TO_DOWNLOADED_SOURCE\pgsql\lib" psql.pro here PATH_TO_DOWNLOAD_SOURCE mean the path to the download zip extracted 7. run mingw32-make 8. run mingw32-make install Congrats. @Christian-Ehrlicher @JonB @mchinand thanks for your time and help :)

Okay, stupid mistake: void insert(int ind, int data){ if(ind < 0 || ind > rowCount()) return; QAbstractListModel::beginInsertRows(QModelIndex(), ind, ind); m_list.insert(ind, data); QAbstractListModel::endInsertRows(); emit countChanged(); } void remove(int ind){ if(ind < 0 || ind >= rowCount()) return; QAbstractListModel::beginRemoveRows(QModelIndex(), ind, ind); m_list.remove(ind); QAbstractListModel::endRemoveRows(); emit countChanged(); }

Hi, for starters, obviously, HD resolution on 23" screen will have larger pixels than on 12". On top of that there is scaling present in Windows, which allows one to scale the content - so you get bigger size of text, icons, etc. I'd suggest to start reading here: https://doc.qt.io/qt-5/highdpi.html In short, having fixed size anything in the UI, when one doesn't know both the target resolution (width, height, dpi) nor the scaling is not best practice. Having locked proportions of the UI elements, so they scale properly - that's something else.

@Jc_Opc I can only answer #2: the choice of using MDI windows has no effect on threads/processes. It is just a way of showing multiple windows, it has nothing to say about and no effect on what you show there.

@Mikeeeeee When dealing with indexes and QSortFilterProxyModel you must deal with mapping between the proxy and the underlying model. https://doc.qt.io/qt-5/qsortfilterproxymodel.html#mapFromSource & https://doc.qt.io/qt-5/qsortfilterproxymodel.html#mapToSource. etc. Is this connected to your issue?

i find the solution . the problem was in selecting table from database and i replace AND by OR and then it checks them one by one . thank you .

Congratulation and thank you for the fix :-)

hi, Did you apply the same technique as @A1exander_Z did ?

Hello @aha_1980 I have cleaned my build directory and that has resulted in the problem, thank you! Regards :)

@SGaist Thanks for your help.

I tried sending file using QByteArray type and it worked.

Hi Sorry no one responded. Ive been looking also into this also you could try (or those searching this topic) KoTextDocumentLayout.h KoTextDocumentLayout.cpp https://github.com/JeremiasE/KFormula/blob/gsoc/libs/kotext/KoTextDocumentLayout.cpp

@artwaw Yes, it works fine eventually :)