General and Desktop

Hi, Since you have 5.15.8, it means you have a commercial licence so you should contact the Qt Company about that matter.

Thanks so much for your help getting this far. After some googling I found an example I was able to follow to finally get it working. First, I changed my fortran to use the iso_c_binding. This lets you set the function name that you will call in the c++ program. subroutine fortfunc(ff) bind(c, name="fortfunc_bind") use, intrinsic :: iso_c_binding implicit none real*4 ff write(6,100) ff 100 format('ff=',f6.3) return end subroutine I got a different error, you have to also add the fortran library to the Qt project. In my case: win32:LIBS += -L"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries_2020.4.311/windows/compiler/lib/ia32_win"

But you didn't add that include dir to INCLUDEPATH and those libs to LIBS. BTW, since you said "using cmake", why are you still using .pro files (which usually means using qmake)?

QScxmlParser was renamed to QScxmlCompiler in Qt5.8

This looks like a doxygen comment. It's added by the author of the code for doxygen, not by an application.

I found a solution that set a data role based on 'userName'. whether have a better way avoiding set redundant data? pItem->setData(userData->at(i).getSNickName(), Qt::UserRole); ..... userDataProxyModel->setFilterRole(Qt::UserRole);

@Christian-Ehrlicher: thank you for your help!

@jsulm Thank you for your kind and supportive replies.

Merged, will be fixed in Qt6.4.

Here is the reason and solution. Thanks to Marti Maria - the author of littlecms - to sort this out ... This program does not work because you missed the part on https://littlecms.com/blog/2020/12/09/using-lcms2-on-qt/ that says: Alpha channels are supported as long as the image is not using premultiplied alpha. To get alpha channel make sure to include cmsFLAGS_COPY_ALPHA in the flags field. This is explained in LittleCMS documentation. So, try: toDisplay = colorManage(sourceImage, profiles, INTENT_PERCEPTUAL, cmsFLAGS_COPY_ALPHA);* This fixed the issue for me.

What OS are you running? Either install Qt and QtcReator via the Qt online installer or use the distribution specific installer like e.g. apt to installer QtCreator. QtCreator is an IDE (which is built with Qt), Qt is a library which also ships some tools like e.g. QtAssistant/Designer/Linguist.

I found a better fix which corrects the problem without reverting to the Windows 95 style. QGuiApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::Floor);

@Dariusz said in Deleting QTcpSocket cause app crash: My MainA is a QSharedPointer<>, Here is the picture of log > I hope you have create it like this QSharedPointer<MainA>(new MainA(), &QObject::deleteLater); It looks to me like extraData can be invalid & cause the core crash? Given my complex thread logic... it may be a bit difficult to reproduce it. I do quite few of if (mSocketPtr) { QMetaObject::invokeMethod(this, [this]() { QMetaObject::invokeMethod(mSocketPtr, [this]() { mSocketPtr->setParent(this); }, Qt::QueuedConnection); }, Qt::QueuedConnection); } I do not understand this! If you want to change parent for a class instance, why do it so complicat? Setting parent can only be done if children and parent in same thread, but it muss not be done in the work thread! I would do it like this: if(mSocketPtr && mSocketPtr->parent() != this) { if(mSocketPtr->thread() != this->thread()) { QMetaObject::invokeMethod(mSocketPtr, [this]() { mSocketPtr->moveToThread(this->thread()); mSocketPtr->setParent(this); }); } else mSocketPtr->setParent(this); }

See the documentation: "In addition, the valueName needs to be set if the option expects a value. "

@andyP its basically a collection of basic types :D the default copy operations should do just fine. Do I have to take some extra step regarding the enum class? I don't hink so

@IknowQT You gather the scroller associated with the QScrollbar QScroller* scroller = QScroller::scroller(this); then QScrollerProperties properties = QScroller::scroller(scroller)->scrollerProperties(); you gather/create a QScroller associated with the first QScroller. Did you mean this perhaps? QScroller* scroller = QScroller::scroller(this); QScrollerProperties properties = scroller->scrollerProperties();

@IknowQT first check what styles are available on your target OS qDebug() << QStyleFactory::keys(); than set it to "Windows" if available QApplication app(argc, argv); qDebug() << QStyleFactory::keys(); app.setStyle(QStyleFactory::create("Windows"));