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Questions tagged [qmetaobject]

QMetaObject is a class from the Qt Toolkit which provides meta-information about Qt objects.

Documentation can be found here (Qt4) and here (Qt5).

61 questions
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QMetaObject::invokeMethod returns true but doesn't execute the solt

I'm trying to run a public slot in another thread using invokeMethod: QMetaObject::invokeMethod(m_manager, "onEventRequest", Qt::QueuedConnection, Q_ARG(int, 0)); Now, invokeMethod returns true and no error message are reported, but the slot…
Zhao Leo
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QMetaObject invoke on overloaded operators

Has anyone tried to invoke overloaded operator << on a QObject. For example i have a class class Worker : public QObject { Q_OBJECT public: explicit Worker(QObject *parent = 0); Q_INVOKABLE virtual void operator<<(char p); }; When i…
GeneralFailure
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Qt metaObject->indexOfMethod always return -1

I have one function declared in Foo class: Q_INVOKABLE void setImageUrl(const QString &imageUrl); However I cannot get the function index of that method: Foo* foo = new Foo(); const QMetaObject* metaObject = foo->metaObject(); QString…
Niklas
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Q_PROPERTY WRITE get index

I have this property: Q_PROPERTY(int _a READ a WRITE setA NOTIFY aChanged) I know only the property's name _a. I would like get the index of the method setA.
artoon
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Enumerate QML properties in Qt C++?

Im doing the following to render a QML in my Qt embedded app: QDeclarativeView *view = new QDeclarativeView(this); view->setSource(QUrl::fromLocalFile("dial.qml")); view->show(); QObject *dial = view->rootObject(); Is there a way i can enumerate…
thecoder
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Class name from QMetaProperty

I am working on making my own designer widget that looks and functions like qt. But now I needed to know how the property is created. I knew we can get the properties of an widget using QMetaObject and QMetaProperty but my question is will I be able…
anbu selvan
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Check if method is invokable in Qt

My Qt5/C++ program creates a method name (string) on the fly and then if the method is invokable will call it (using invokemethod). And if not invokable/does not exist, then it will no attempt to invoke it. My methods would be defined like…
TSG
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I am getting an error on Qt, and can't figure out where I went wrong

So, I am learning my way around Q_PROPERTY, QMetaObject and QMetaProperty. I have built a working GUI, but whenever I run the script, I get an error Can anyone tell me what I did wrong/am doing wrong? The QDout() function, as mentioned, is only…
Martin Sieburg
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How can I test method calling QMetaObject::invokeMethod with Qt::QueuedConnection -- using gtest gmock framework

Suppose I have a method and I want to test it using gtest/gmock framework. This method calls another method inside itself using a Qt queued invoke: void MyClass::handleFoo() { // ... Q_ASSERT(QMetaObject::invokeMethod(this, "handleBar",…
JenyaKh
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readOnGadget for a Q_GAGDET inside a Q_GADGET not working as expected

I have a "top level" Q_GADGET and, inside this Q_GADGET, I have a pointer to another Q_GADGET. I am trying to use the function readOnGadget to display the values stored by both objects. I can do this just fine with the top level Q_GADGET, however…
Raphael Sauer
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Proper way to add enum class to metaObject Qt 5.15

I'm tinkering a bit with Qt's meta-object system, and I've come across an issue with adding enum class to a meta-object. I have a struct that contain some variables, one of which is an enum class. #ifndef EXAMPLE_H #define EXAMPLE_H #include…
Raphael Sauer
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Wy is QMetaObject::invokemethod searching for a function from the wrong object

In my work project I have run into a particularly strange behaviour. During runtime, when calling QMetaObject::invokeMethod, I get a print indicating that the program is trying to find the specified method from QObject, instead of the actual class…
Narmondur
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QMetaType confuses two symbols with identical name but different namespace

Consider the following minimal example: namespace foo { struct MyStruct {}; } Q_DECLARE_METATYPE(foo::MyStruct) namespace bar { struct MyStruct {}; } Q_DECLARE_METATYPE(bar::MyStruct) // later on near the entry point of the…
Petr Mánek
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Register inherited QObject's meta object to QJSEngine

I would like to inherit the QObject class, and register the inherited class's meta object to a QJSEngine instance, so that I can call let instance = new TrialObject(); in JavaScript. Here is my code: from PyQt6.QtQml import QJSEngine from…
SamG101
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QMetaObject::invokeMethod does not call slot

I have a public signal called UpdateScreenshots in the workspacemanager class that takes screenshots of some widgets. It then returns these screenshots in a struct I've defined. This call is made from a thread as taking screenshots can apparently…
Mr.Grease
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