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Questions tagged [moc]

MOC is Qt's Meta Object Compiler. It transforms certain Qt-specific macros into the C++ code and meta information necessary for Qt's signal and slots, RTTI, and the dynamic property system.

The meta-object system is based on three things:

  1. The QObject class provides a base class for objects that can take advantage of the meta-object system.
  2. The Q_OBJECT macro inside the private section of the class declaration is used to enable meta-object features, such as dynamic properties, signals, and slots.
  3. The Meta-Object Compiler (moc) supplies each QObject subclass with the necessary code to implement meta-object features.
216 questions
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Generatin finger print template

I need to generate finger print template on Windows CE 5.0 device. It has izzix finger print reader. I have to MOC (Match on card). My smart card has template derived from my finger print. I can read finger print using reader. But how can i generate…
suyuti
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Qt undefined reference vtable

I made simple game to shot rectangle(class Bullet) from other rectangle(class MyRect). I have error undefined reference to 'vtable for bullet'. I have written that is connected with Q_OBJECT and moc.I can't resolve this problem. Bullet.h #ifndef…
Paweł
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Generate moc file for header only class outside the project tree

I have some classes defined only using a headers file that inherits the QObject class and uses the Q_OBJECT macro. They are placed in a certain folder on my PC. I want to include these classes in my qt project. I have written a .pri file (located in…
Lorenzo Aldrighetti
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Error when building Qt app in a recent Docker

I am building a Qt c++ app in a Docker on Travis. I am trying to update the base Docker image from Cosmic to Disco. I did these updates: Travis dist: Trusty => Xenial Docker image: Cosmic => Disco Now I get this error when building: clang: error: no…
Denis Rouzaud
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Force the Qt MOC to expand some custom macros?

Is it possible to force the Qt MOC to expand some of my custom preprocessor defines to achieve some kind of 2-pass preprocessing? E.g.: // MOC macro @MOC #define add(a, b) (a + b) // Should be expanded by MOC (1st run) // "Normal" macro #define…
FlKo
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C++ Preprocessor and QT MOC

I am attempting something (perhaps stupid). Have used some macroes to create "amounts" of functions in C++ domain; #define THR_CONFIG_VALUE(path, value, type, name, defaultvalue) \ type name() { return m_##name; } \ void set##name(type data)…
Tore H
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Qt moc chokes on DEFINE containing too many backslashes

We are still on Qt4.7 in our workplace, so bear in mind this could be a known bug fixed in later versions. I have googled for this problem and it is possible I am not using correct terms. Here goes. In my .pro file I have: win32 { DEFINES +=…
iwarv
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How can I call a method from QMainWindow?

I do need to invoke a method from my MainWindow class, that inherit from QMainWindow class from a class outside MainWindow, something like this: Q_ASSERT(QMetaObject::invokeMethod(mainWindow, "attachmentDownloadComplete")); mainWindow is of class…
Jack
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Signal Slot is missing in moc file

I cannot use the button, which I have connected with the correct slot. Here the infoPage.cpp file: #include "infoPage.h" InfoPage::InfoPage(QWidget *parent) : QDialog(parent) { ui.setupUi(this); bool working = false; working =…
Makuna
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Can we implement multiple QtRO interfaces in the same object?

It's all in the question. I am wondering if we can implement multiple QtRO (Qt remote objects) interfaces in the same object. And then in the client side acquire a replica of the part we need of the server object.
Houss_gc
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moc: Unknown option -isystem

I am trying to install score-p. It has standard build chain. I passed the configuration part successfully. Makefile was generated automatically after configuration. Then I did make and got an error. The problem is moc complains that -isystem is an…
Shibli
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Qt moc.exe - difference between 32 and 64-Bit version?

I am trying to find out what the difference is between the moc.exe (Qt meta object compiler) in the respective 32-bit and the 64-bit subfolder of Qt5. Does it make any difference if I let my application with 64-Bit target architecture be built (and…
Navie
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Using CMAKE_AUTOMOC with a custom version of Qt

I am developing a plugin for Maya which comes with its own custom version of Qt library (including the moc). I downloaded the exact Qt version Maya uses and tried the following: set(CMAKE_AUTOMOC ON) find_package(Qt5Widgets) Now this works but only…
Samaursa
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Qt: How are arrays or dictionaries passed from qscriptengine?

I've created a QScriptEngine and exposed an object's function I can call from js script. engine->globalObject().setProperty("obj", myObj); myObj is a QObject that has a function like... void MyObject::doSomething(int w, int h) { ... } and in…
voodoogiant
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How to make a JSON-like QObject

In short, I want to make an JSON-like object, which is easily accessible to both QML / Qt C++ side. In QML, I can make a settings object like this: Item { id: settings property alias snapshot: snapshot QtObject { id: snapshot …
kuanyui
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