Qt resources files with CMake and AUTORCC - c++

Question

Solution:
Add resource files in the add_executable() statement
Problem
(not in the add_library())
Fail to set main window icon.
Notes:
When I don't use AUTORCC I run into some compilation problems:
QtCore/qglobal.h: no such file or directory. But, I do prefer AUTORCC as a more modern CMake approach.
Without the AUTORCC (different CMakeLists.txt than the provided) and Qt-4.6.2 the current code worked.
different CMakeLists.txt)
Code
This is a minimized code of my project. Tree:
|- CMakeLists.txt
|- main_window.hpp
|- main_window.cpp
|- main.cpp
|- resources
| - resources.qrc
| - images
| - logo.png
main_window.cpp
#ifndef MAINWINDOW_HPP
#define MAINWINDOW_HPP
#include <QMainWindow>
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
};
#endif
main_window.cpp
#include "main_window.hpp"
MainWindow::MainWindow()
{
// i tried ":/images.png", ":/resources/images/logo.png", ":/logo.png"
setWindowIcon(QIcon(":images/logo.png"));
}
main.cpp
#include <QApplication>
#include "main_window.hpp"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
app.setOrganizationName("Organization");
app.setApplicationName("Application Example");
MainWindow mainWin;
mainWin.show();
return app.exec();
}
CMakeLists.txt.
cmake_minimum_required(VERSION 3.1)
project(qt_project)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
find_package(Qt4 4.6 REQUIRED)
set(QT_USE_QTGUI TRUE)
set(QT_USE_QTXML TRUE)
include(${QT_USE_FILE})
add_definitions(${QT_DEFINITIONS})
// NOTE: it would be more convenient to be able to add the
// resource file here upon the creation of the library
add_library(mylib main_window.cpp)
// SOLVED
// BEFORE: add_executable(qt_test main.cpp)
add_executable(qt_test main.cpp resources/resources.qrc)
target_link_libraries(qt_test
mylib
${QT_LIBRARIES}
)
resources/resources.qrc
<!DOCTYPE RCC><RCC version="1.0">
<qresource>
<file>images/logo.png</file>
</qresource>
</RCC>
Edit
This is the generated qrc_resources.cxx
#include <QtCore/qglobal.h>
static const unsigned char qt_resource_data[] = {
// /users/ddakop/dev/misc/qt/resources/images/logo.png
// ... removed hex data
};
static const unsigned char qt_resource_name[] = {
// images
// ... removed hex data
// logo.png
// ... removed hex data
};
static const unsigned char qt_resource_struct[] = {
// :
0x0,0x0,0x0,0x0,0x0,0x2,0x0,0x0,0x0,0x1,0x0,0x0,0x0,0x1,
// :/images
0x0,0x0,0x0,0x0,0x0,0x2,0x0,0x0,0x0,0x1,0x0,0x0,0x0,0x2,
// :/images/logo.png
0x0,0x0,0x0,0x12,0x0,0x0,0x0,0x0,0x0,0x1,0x0,0x0,0x0,0x0,
};
QT_BEGIN_NAMESPACE
extern Q_CORE_EXPORT bool qRegisterResourceData
(int, const unsigned char *, const unsigned char *, const unsigned char *);
extern Q_CORE_EXPORT bool qUnregisterResourceData
(int, const unsigned char *, const unsigned char *, const unsigned char *);
QT_END_NAMESPACE
int QT_MANGLE_NAMESPACE(qInitResources_resources)()
{
QT_PREPEND_NAMESPACE(qRegisterResourceData)
(0x01, qt_resource_struct, qt_resource_name, qt_resource_data);
return 1;
}
Q_CONSTRUCTOR_FUNCTION(QT_MANGLE_NAMESPACE(qInitResources_resources))
int QT_MANGLE_NAMESPACE(qCleanupResources_resources)()
{
QT_PREPEND_NAMESPACE(qUnregisterResourceData)
(0x01, qt_resource_struct, qt_resource_name, qt_resource_data);
return 1;
}
Q_DESTRUCTOR_FUNCTION(QT_MANGLE_NAMESPACE(qCleanupResources_resources))
System
CentOS-5, Qt-4.8.6, CMake-3.2.1, gcc-4.8.2

Answer 1

I think you need to link qrc_resources generated file.
I suppose you know the next info:
http://www.cmake.org/cmake/help/latest/manual/cmake-qt.7.html
Where you can see the next line:
add_executable(myexe main.cpp resource_file.qrc)
More info:
http://www.cmake.org/cmake/help/latest/prop_tgt/AUTORCC.html

Answer 2

I'm not sure if this is new or not, but I have figured out a way to add resources to libraries.
In my library's CMakeLists.txt I have the following:
list (APPEND RESOURCES library.qrc)
qt5_add_resources (RCC_SOURCES ${RESOURCES})
...
add_library(library ${RCC_SOURCES} ${SOURCES})
In the library, in one of my "main classes" (for me, this class was the first thing that gets created in the library and the last thing that gets destroyed), I did the following:
class libClass : public QMainWindow {
Q_OBJECT
public:
libClass() : QMainWindow(nullptr, 0) {
Q_INIT_RESOURCE(library);
}
~libClass() {
Q_CLEANUP_RESOURCE(library);
}
};