General and Desktop

You could also use a copyable smart pointer like QSharedPointer if threading issues are considered.

I solved, I tried to install the files according to the Qt instructions but failed. I installed Android Studio and installed all the components. [image: e38963c3-8219-4c11-aa9b-aee4d85c59b0.png]

You are not doing the resizing with OpenCV.

Hi, A full rebuild is not strictly required however running qmake before building is when adding or removing the Q_OBJECT macro as moc must do its job when added and otherwise not run when removed. But when I doubt, full rebuild often helps.

Which version are you building from ?

My bad, it seems the issue was on my side. I'm closing this.

@JonB You've done more than enough, thanks Time to read I guess haha

@makopo What was the issue ?

@LT-K101 said in How to plot Barchart using database queries: implementing this using the values from the sql queries seem confusing. What does this mean? What are you actually asking us?? The fact that you get data from a database has no connection to code for adding bars on a chart. Your series appending looks OK, only you know what is in first_value etc. and how you got it from the database. I don't see what you think someone else can say. Break your problem into two: Get the bar/pie chart right by testing with sample hard-coded values, no database. Get your data from database queries, printing out the results, no charts. Then just connect the two bits of code.

Hi Depending on the SENDING hardware, the payload will come in one or more "waves"/readAll() So once recievedData.size() is the expected size, all data has been read. There is no setting to avoid this. Its how it works.

@SGaist Thank you

Use actions and connect them to the cut, copy, paste slots.

@SPlatten I don't know, really. It works on my iMac. I would, however, recommend to reinstall the command line tools - this would trigger reinstallation of the SDK

@millo98 said in problem with QNetworkAccessManager: the program build but don't run with 'Process finished with exit code -1073741515 (0xC0000135)' Use a debugger to see where it crashes... /edit: 0xC0000135 looks like a missing dll, can you start debugging at all?

in my example i have 3 states, so i need make something like: connect(state1, &MyState::transitionToState2Required, state2, &MyState::onTransitionExecuted); connect(state1, &MyState::transitionToState3Required, state3, &MyState::onTransitionExecuted); connect(state2, &MyState::transitionToState1Required, state1, &MyState::onTransitionExecuted); connect(state2, &MyState::transitionToState3Required, state3, &MyState::onTransitionExecuted); connect(state3, &MyState::transitionToState1Required, state1, &MyState::onTransitionExecuted); connect(state3, &MyState::transitionToState2Required, state2, &MyState::onTransitionExecuted); but if i have about 10 states I'll need to create about 100 such connections. may be there is any general mechanism? as i understand, if make like this: connect(state1, &MyState::transitionToState2Required, state2, &MyState::beforeTransitionExecuted); state1->addTransition(state1, &MyState::transitionToState2Required, state2); slot beforeTransitionExecuted will called before transition and i can save data in target slot? and if i make: state1->addTransition(state1, &MyState::transitionToState2Required, state2); connect(state1, &MyState::transitionToState2Required, state2, &MyState::onTransitionExecuted); transition will be executed early and only then onTransitionExecuted will be called? so it's better to use first variant?

@nouwaarom said in Addressbook example: separation of concerns: Then the view will call TableModel::setData for these columns when they are double clicked and their value is updated. So what's different from the example then? That a separate widget instead a view updates the data? Who says that 'the view' must be a single widget?