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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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Qt moc file is not expanding a macro defined before #include "foo.h"

Given the following code: // foo.h #ifdef BIG_DATA_MACRO #warning "TEXT ADDED" #define TEXT_HANDLING_MACRO \ static const char * TEXT[]; \ static const char * getText( int _enum ) { \ return TEXT[_enum]; \ …
Oli
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How to use the pimpl idiom with Qt and subclasses of QObject

I would like to know the easiest way to implement the pimpl idiom in Qt objects. What I want to have is something like this: pimpl.h: class B; class A: public QObject { B *b; } pimpl.cxx: class B: public QObject { } Now, as is obvious, Qt…
code_not_yet_complete
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Qt Signal/Slot configuration

I have a matter with signal/slots in Qt 5.6.0 When I try to compile, I get the following error: I googled it and I found out when I use qmake(which is the case I believe) then I have to do some moc tricking, however as a compelte Qt beginner I did…
Bachey
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Passing arguments from qmake to moc per header

I'd like to be able to pass arguments to the moc compiler from a qmake project, but only for specific files. Example, in some .pro file: HEADER += foo.h \ bar.h \ baz.h I'd like to pass -ffoo_extra.h to foo.h, -fbar_extra.h to…
Scott
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Qt moc error using CMake

I am trying to write an OpenCV application creating the GUI with Qt and generating the makefiles using CMake. The problem that I have is that when I try to execute the make command, I get the error: This file was generated using the moc from 5.2.1.…
Mr Squid
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Dynamically use QGLWidget or QOpenGLWidget depending on Qt version

My code is supposed to compile and run on platforms before and after Qt 5.4 where QOpenGLWidget was introduced, superseding QGLWidget. I thought I could write code like this to support both: #if QT_VERSION >= QT_VERSION_CHECK(5, 4, 0) # define…
josch
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cmake qt automoc - getting automoc'ed files as variable

Is it possible to get the automoc'ed files (Qt moc)? That would be great because i could put it on a source_group. I'm using cmake 3.4.1 Thanks in advance Tonka
Michael Aigner
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Qt moc issue (moc.exe: command not found) while building Qwt with Qt 5 in Windows

Building Qwt with Qt 5 fails (with Qt 4 works) in Windows 7 64 bits. I tried via Qt Creator and via CLI but both ends in: 12:51:08: Running steps for project qwt... 12:51:08: Starting: "C:\Qt\Qt5.3.2\5.3\mingw482_32\bin\qmake.exe"…
KcFnMi
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Qt5.5.1: How to create QT application that uses frameworks generated from qt-everywhere-opensource-src

I should have asked this question before asking this I am creating a QT app (on MAC) that should use frameworks compiled from qt-everywhere-opensource-src-5.5.1.tgz and not the one that comes with qt-opensource-mac-x64-clang-5.5.0.dmg. I use QT…
JamesWebbTelescopeAlien
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Wrong qt moc.exe path

I'm trying to switch from Qt4.8.6 to Qt5. I'm using MSVS2010 for my old code in c++/Qt. I changed all the paths and made other changes for Qt migration. On recompiling the code I noticed the moc.exe path is still pointing to older version of Qt i.e.…
gaj
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Auto moc file generation in Makefile

So i have a pretty standard make file #!/bin/bash CXX=g++ CXXFLAGS= -g -Wall SOURCES=$(wildcard src/*.cpp) OBJECTS=$(addprefix obj/,$(notdir $(SOURCES:.cpp=.o))) INCLUDES=-I/usr/include/ -I.…
SketchyManDan
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How to create moc files in Visual Studio 2013?

Currently I am using Visual Studio 2013 on Windows 8.1. I have installed the QT5 add-in with version QT 4.8.3(Because I couldn't install QT4 add-in). When running my project, almost moc files are generated. But my class didn't generate moc files.…
Cợi Tru Vô Rú
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Exclude moc files from solution generated by Cmake

I create a project with cmake for Visual Studio 10, using Qt5.4 library. Cmake generates moc files for Qt and integrates these files into my solution. I would like to find a way to prevent Cmake to integrate the moc files into the solution, coz then…
Quentin Tealrod
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New QObject::connect syntax doesn't work

I'm using the new syntax for QObject::connect to connect a signal to a slot: connect(m_pNetworkReply, &QNetworkReply::error, this, &MyClass::onError); but I'm getting this weird error and I have no idea…
Jacob Krieg
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No moc file is generated by make

I try to compile a qt cpp file but no moc is generated for Q_OBJECT objects. I am using Maya's distribution of qt. My makefile.qt file looks like this and I am compiling with make -f makefile.qt myPlugIn.bundle: %.mak : %.pro qtconfig $(QMAKE)…
Laurent Crivello
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