@JonB
Thanks.. found out, that i needed to create a new Pointer in the Declaration of the .h File..

Means..

TGS_Widget_AssetList * _assetList;

Wasn´t enough...
I needed to do:

TGS_Widget_AssetList *_assetList = new TGS_Widget_AssetList(this); or auto *_assetList = new TGS_Widget_AssetList(this);

Now it works.. i will update my initial post here

Correct.

@Vinoth-Rajendran4
Further to @Christian-Ehrlicher, in other words that means you need to delete the statement Hello* obj = new Hello;! Your calling code will go new Hello, and that will execute your constructor and return the created instance, you don't want another new Hello anywhere inside your Hello class as it stands.

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()));