General and Desktop

@JonB , found the issue, stupid but you have to add --databases to the command line.

Thank you.

Hi Kent, Is their any way where we can increase and decrease the QT internal timer so that its give a buffer in between that?

right ! my mistake !thanks

@JonB I will investigate now.

data, time, and timezone must be the same on RPI and kepware OPC server :P.

@ocgltd said in libmysqlclient.so mismatch on fedora 33: Is this a bug? No, it just means that Qt MySQL plug-in was built using older MySQL version...

@Kent-Dorfman , thank you, I've noticed that when I use QFileDialog::getExistingDirectory which I use elsewhere, this does include all the locations that are missing from the instance created with QFileDialog, sorry I missed the way I an invoking the original is just with show.

@mrjj I got the output bro... Thankyou ...

@SGaist Are you starting it ? The command line ? from Qt Creator

@Sina-Ranjkesh-zade said in Converting QByteArray to QString: For "standard input" if you mean input arguments of the process, I got this error: No, I meant standard input. That is , the python program reads from a terminal and accepts input just as if you typed it (except it is the Qt program sending that input). The Qt program can send a command to the python program, send the data it needs, and read the result (if there is one) back on the python program's standard output. Or you can used shared memory, or a socket, or files, or do whatever the python program is doing in the Qt program...

AUTOSAR-A0-4-2 rule for safety critical c++ applications: Type long double shall not be used. The width of long double type, and therefore width of the significand, is implementation defined.

As the name and description suggest - installs debugging symbols (pdb files on Windows) that you can use to debug Qt Creator itself.

I gave you the full chain of inheritance back to QWidget. Yes you can put a layout on an QScrollArea. As already said by @Pl45m4, it's not what you do when you want to use QScrollArea to manage a widget bigger than for example the screen. Still, there might be cases where putting something in a layout on a QScrollArea could make sense. However I do not have an example at hand.

okay turns out i wasn't creating the thread correctly. when i switched to "worker thread" style as explained here, it all started working. :)

@SGaist thanks for that. It's just an example you know. But all the same, I will keep this in mind.

As a general point, I prefer using usual C++ std::string (they all are UTF8 encoded), or C const char* string (UTF8). The reason is more political than technical: I am afraid that in 2021, funding agencies prefer Web interfaces to Qt ones (on desktops or laptops) for software having several human users at once. Also, RefPerSys being today a research project, efficiency is not a priority, and losing CPU time in lots of std::string to QString conversion (and vice versa) is now (july 2021) acceptable. Our long term vision is to generate C++ code (from our higher-level declarative formalism, expert system like). Ideally, like Pitrat explains in his Artificial Beings: the Conscience of a Conscious Machine book (ISBN 978-1848211018), we want to generate all the C++ code of RefPerSys. Of course, that is an ambitious goal, and we are very far from it. Sadly, in july 2021, we have very few generated C++ lines. BTW, Jacques Pitrat was the director of my PhD jury, defended in Paris in 1990. The local variable obshowstring is declared as std::string obshowstring in file tempgui-qrps.cc, for commit 7fa10ba9cd62 in line 331 Regards, and thanks for your help. Basile Starynkevitch - near Paris in France PS. Off-topic: I am interested in any HorizonEurope submission which could fund RefPerSys. The RefPerSys website mentions some potential calls (e.g. HORIZON-CL2-DEMOCRACY-2022-01-01, HORIZON-CL2-DEMOCRACY-2022-01-05, HORIZON-CL2-DEMOCRACY-2022-01-06, HORIZON-CL2-HERITAGE-2022-01-03, HORIZON-CL2-HERITAGE-2022-01-04, HORIZON-CL2-HERITAGE-2022-01-06, HORIZON-HLTH-2021-STAYHLTH-01-02, HORIZON-HLTH-2022-STAYHLTH-01-01, HORIZON-HLTH-2022-STAYHLTH-01-04, HORIZON-HLTH-2022-STAYHLTH-02-01 but there could be others. Contact me then by email to both basile@starynkevitch.net (personal email) and to basile.starynkevitch@cea.fr (professional email at CEA LIST)