Hi If you changed to Dialog::Dialog(QStringList listToLoad, QWidget *parent = 0) ; Make sure to change it both in .h file and .cpp file so they match.

Dear All: here is my situation The class which cause compile Error is PropertyColumnMapping in DynamicObjectCore.pro Then CommonBusiness.pro using this class And Presentation linked to both CommonBusiness.pro & DynamicObjectCore.pro Clean + QMake + Rebuild doesn't work. Here is my Project Structure. Application.pro TEMPLATE = subdirs CONFIG += ordered SUBDIRS += Framework Services Business Presentation Updater QT += qml quick widgets network sql xml Business.pro TEMPLATE = subdirs SUBDIRS += CommonBusiness ServiceBusiness //Link to Framework.System CommonBusiness.pro QT -= gui QT += qml quick sql xml xmlpatterns network TARGET = CommonBusiness TEMPLATE = lib CONFIG += staticlib c++11 SOURCES += commonbusiness.cpp ... HEADERS += commonbusiness.h ... //# Link to FrameWork.DynamicObjectCore DynamicObjectCore.pro QT -= gui QT += qml TARGET = DynamicObjectCore TEMPLATE = lib CONFIG += staticlib c++11 #DEFINES += DYNAMICOBJECTCORE_LIBRARY SOURCES += MetadataModel/propertycolumnmapping.cpp ... HEADERS += MetadataModel/propertycolumnmapping.h ... unix { target.path = /usr/lib INSTALLS += target } Presentation.pro TEMPLATE = app TARGET = [ApplicationName] QT += qml quick widgets network sql xml xmlpatterns //# for QT 5.4 qtHaveModule(webengine) { QT += webengine DEFINES += QT_WEBVIEW_WEBENGINE_BACKEND } qtHaveModule(webkitwidgets) { QT += webkitwidgets } //# for QT 5.7 equals(QT_VERSION, QT_VERSION_CHECK(5, 7, 0)) { QT += webview DEFINES += QT_WEBVIEW_CONTROL_BACKEND } CONFIG += c++11 CONFIG(release, debug|release) { CONFIG += release force_debug_info } RESOURCES += qml.qrc shared.qrc //# Link to DynamicObjectCore //# Link to CommonBusiness

Hi, QObject is a non copyable type. See here for more information.

Hi, Since you marked it solved, can you share what you did to fix your code ?

@alogim Hello, Unfortunately, no. To make use of the parent-child mechanism your object must derive from QObject at least. Search through the forum for "QObject" and "RAII", Here is a thread where I've put some effort in explaining the QObject ownership. Back to your question: class Object : public QObject { public: Object(QWidget * parent = 0) : QObject(parent) { } }; Will do what you want, i.e. delete the Object when the parent is destroyed. Then you indeed create your object like this: Object * obj = new Object(this); and it's sufficient to ensure proper cleanup. Kind regards.

@Wieland Thank you, I guessed the first was some kind of copy constructor. As concerns the second, it was just a curiosity of mine. Thank you :)

I solved my problem with not calling parseFunction in its own class constructor but with signals and slots in mainwindow.cpp file: connect(xml, SIGNAL(started()), first, SLOT(parseFunction()));