4. Migrating Qt.4.8 to Qt.5.8 errors

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Migrating Qt.4.8 to Qt.5.8 errors


  • Hi all,

    I'm migrating my desktop application from qt.4.8.6 version to qt.5.8.

    I have the following code:

    (file.h)
    ....
    ....
    signals:

    void signal1();

    #ifdef WIN32
    void signal2();
    #endif

    In the generated moc file signal2 is not created (signal1 yes)

    However, if the file is like:

    ....
    ....
    signals:

    void signal1();

    #ifndef APPLE
    void signal2();
    #endif

    In the generated moc file signal2 IS CREATED

    What is the difference?

    0

  • Moc is not the compiler so it might not get the same preprocessors when it runs. can you try with #ifdef Q_OS_WIN32

    1

  • To add to @VRonin, for a list of all these macros see Global Qt Declarations.

    1

  • Thanks for your answers.

    I had already tried with Q_OS_WIN32, and it does not solve my problem.
    Besides, I have defined other constants and i have the same problem.

    0

  • This is strange, you can pass -DWIN32 as an argument to moc but it shouldn't be necessary. What build system are you using?

    0

  • I'm using cmake3.7.2, and compiling with visual studio 2015.

    0

  • can you post your CMakeList?

    1

  • Here is the code:

    CMAKELIST.TXT:

    cmake_minimum_required (VERSION 3.2)

project (QT5Example)

#-----------------------------------------------------------------------------
# List of source files
set (QT5EXAMPLE_SRCS
  QT5Example.cxx
  QT5ExampleDlg.cxx
)

set (QT5EXAMPLE_HDRS
  QT5ExampleDlg.h
)
  
#-----------------------------------------------------------------------------
# List of moc'ables

set (QT5EXAMPLE_MOC_HDRS
  QT5ExampleDlg.h
)

#-----------------------------------------------------------------------------
# The ui files

set (QT5EXAMPLE_UIS
  QT5ExampleDlg.ui
)

#-----------------------------------------------------------------------------
# Find and use Qt libraries 

find_package (Qt5Core)
set (QT_LIBS ${QT_LIBS} ${Qt5Core_LIBRARIES})
set (QT_INCLUDES ${QT_INCLUDES} ${Qt5Core_INCLUDE_DIRS})
find_package (Qt5Widgets)
set (QT_LIBS ${QT_LIBS} ${Qt5Widgets_LIBRARIES})
set (QT_INCLUDES ${QT_INCLUDES} ${Qt5Widgets_INCLUDE_DIRS})


#-----------------------------------------------------------------------------
# Set additional include directories in the project configuration.
# Directories in binary tree are needed for generated ui and resource headers.
#
include_directories ( 
  ${QT_INCLUDE_DIR}
  ${QT_INCLUDES}
  ${CMAKE_CURRENT_BINARY_DIR}
  ${CMAKE_CURRENT_SOURCE_DIR}
)

#-----------------------------------------------------------------------------
# Generate ui sources for headers in Qt

qt5_wrap_ui (QT5EXAMPLE_UI_HDRS "${QT5EXAMPLE_UIS}")

#-----------------------------------------------------------------------------
# Generate moc sources for headers in Qt

qt5_wrap_cpp (QT5EXAMPLE_MOC_SRCS "${QT5EXAMPLE_MOC_HDRS}")
add_definitions(-DQT_GUI_LIBS -DQT_CORE_LIB )


#-----------------------------------------------------------------------------
# Group the generated files in different source groups so they appear together in the IDE

source_group (Designer FILES
  ${QT5EXAMPLE_UIS}
)

source_group (Generated FILES 
  ${QT5EXAMPLE_MOC_SRCS}  
  ${QT5EXAMPLE_UI_HDRS}
)


add_executable (QT5Example
  ${QT5EXAMPLE_SRCS}
  ${QT5EXAMPLE_HDRS}
  ${QT5EXAMPLE_MOC_SRCS}
  ${QT5EXAMPLE_UIS}
  ${QT5EXAMPLE_UI_HDRS}
  ${QT5EXAMPLE_QM}
)

target_link_libraries (QT5Example 
  ${QT_LIBS}
)

    QT5EXAMPLE.CXX:

    #include <QApplication>

#include "QT5ExampleDlg.h"

int main(int argc, char *argv[])
{
  QApplication app(argc, argv);

  QT5ExampleDlg* dlg = new QT5ExampleDlg(); 
  dlg->show();
  
	return app.exec();
}

    QT5EXAMPLEDLG.H:

    #ifndef __QT5ExampleDlg_h
#define __QT5ExampleDlg_h

#include "ui_QT5ExampleDlg.h"

#include <QDialog>

class QT5ExampleDlg : public QDialog
{
  Q_OBJECT

public:
  
  QT5ExampleDlg(QWidget *parent = 0, Qt::WindowFlags flags = 0);
  ~QT5ExampleDlg();

signals:

  void message1();

#ifdef Q_OS_WIN
  void message2();
#endif

public slots:

  void OnPushButton1();

  void OnPushButton2();

  void OnMessage1();

  void OnMessage2();

private:

  Ui::QT5ExampleDlgUI ui;

};

#endif // __QT5ExampleDlg_h

    QT5EXAMPLEDLG.CXX:

    #include "QT5ExampleDlg.h"

QT5ExampleDlg::QT5ExampleDlg(QWidget *parent, Qt::WindowFlags flags)
 : QDialog(parent, flags)
{
  ui.setupUi(this);
  QObject::connect(ui.pushButton1, SIGNAL(clicked()), this, SLOT(OnPushButton1()));
  QObject::connect(ui.pushButton2, SIGNAL(clicked()), this, SLOT(OnPushButton2()));
  QObject::connect(this, SIGNAL(message1()), this, SLOT(OnMessage1()));
  QObject::connect(this, SIGNAL(message2()), this, SLOT(OnMessage2()));
}


QT5ExampleDlg::~QT5ExampleDlg()
{
}

void QT5ExampleDlg::OnPushButton1()
{
  emit message1();
}

void QT5ExampleDlg::OnPushButton2()
{
#ifdef Q_OS_WIN
  emit message2();
#endif
}

void QT5ExampleDlg::OnMessage1()
{
  ui.simpleLineEdit->setText("message1 emitted");
}

void QT5ExampleDlg::OnMessage2()
{
  ui.simpleLineEdit->setText("message1 emitted");
}

    QT5EXAMPLEDLG.UI:

    <?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>QT5ExampleDlgUI</class>
 <widget class="QWidget" name="QT5ExampleDlgUI">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>246</width>
    <height>149</height>
   </rect>
  </property>
  <property name="sizePolicy">
   <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
    <horstretch>0</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name="maximumSize">
   <size>
    <width>300</width>
    <height>16777215</height>
   </size>
  </property>
  <property name="windowTitle">
   <string>Form</string>
  </property>
  <layout class="QVBoxLayout">
   <property name="spacing">
    <number>6</number>
   </property>
   <property name="margin">
    <number>9</number>
   </property>
   <item>
    <widget class="QGroupBox" name="SimpleGroupBox">
     <property name="maximumSize">
      <size>
       <width>250</width>
       <height>200</height>
      </size>
     </property>
     <property name="title">
      <string>Simple Groupbox</string>
     </property>
     <layout class="QVBoxLayout">
      <property name="spacing">
       <number>6</number>
      </property>
      <property name="margin">
       <number>9</number>
      </property>
      <item>
       <layout class="QHBoxLayout">
        <property name="spacing">
         <number>6</number>
        </property>
        <property name="margin">
         <number>0</number>
        </property>
        <item>
         <widget class="QLabel" name="SimpleLabel">
          <property name="text">
           <string>Simple Label</string>
          </property>
         </widget>
        </item>
        <item>
         <spacer>
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
          </property>
          <property name="sizeHint" stdset="0">
           <size>
            <width>100</width>
            <height>30</height>
           </size>
          </property>
         </spacer>
        </item>
        <item>
         <widget class="QLineEdit" name="simpleLineEdit">
          <property name="enabled">
           <bool>false</bool>
          </property>
          <property name="minimumSize">
           <size>
            <width>50</width>
            <height>0</height>
           </size>
          </property>
          <property name="maximumSize">
           <size>
            <width>150</width>
            <height>20</height>
           </size>
          </property>
         </widget>
        </item>
        <item>
         <spacer>
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
          </property>
          <property name="sizeHint" stdset="0">
           <size>
            <width>40</width>
            <height>20</height>
           </size>
          </property>
         </spacer>
        </item>
       </layout>
      </item>
      <item>
       <layout class="QHBoxLayout">
        <property name="spacing">
         <number>6</number>
        </property>
        <property name="margin">
         <number>0</number>
        </property>
        <item>
         <widget class="QPushButton" name="pushButton1">
          <property name="minimumSize">
           <size>
            <width>100</width>
            <height>25</height>
           </size>
          </property>
          <property name="maximumSize">
           <size>
            <width>100</width>
            <height>16777215</height>
           </size>
          </property>
          <property name="text">
           <string>Text1</string>
          </property>
         </widget>
        </item>
       </layout>
      </item>
      <item>
       <layout class="QHBoxLayout" name="horizontalLayout">
        <item>
         <widget class="QPushButton" name="pushButton2">
          <property name="minimumSize">
           <size>
            <width>100</width>
            <height>25</height>
           </size>
          </property>
          <property name="maximumSize">
           <size>
            <width>100</width>
            <height>16777215</height>
           </size>
          </property>
          <property name="text">
           <string>Text2</string>
          </property>
         </widget>
        </item>
       </layout>
      </item>
     </layout>
    </widget>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>
    0

  • You are using a recent version of CMake, see http://doc.qt.io/qt-5/cmake-manual.html

    cmake_minimum_required (VERSION 3.2)
project (QT5Example)
set(CMAKE_AUTOMOC ON)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
find_package (Qt5Core)
find_package(Qt5Widgets)
    1

  • Thanks, now it's working.

    0
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