strange error in compilation

**quickNitin** · 30th August 2006, 08:05

i am having strange error in compilation. I am presenting some part of my header file and output on terminal

Qt Code:

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#ifndef vA_H
#define vA_H
 
//QT4 includes
#include <QObject>
 
//QGIS includes
#include <qgisapp.h>
#include <qgsmaptool.h>
#include <qgsmapcanvas.h>
#include<qgspoint.h>
#include "../qgisplugin.h"
#include<QToolBar>
//#include "vARubberBand.h"
 
//forward declarations
 
//class QToolBar;
class vARubberBand;
/**
* \class Plugin
* \brief [name] plugin for QGIS
* [description]
*/
class vA1:public QgsMapTool , public QgisPlugin
{
  Q_OBJECT;
  public:
  vA1(QgisApp * theApplication, QgisIface * theInterface);
  //! Destructor
  virtual ~vA1();
 
	//! inherited from QgsMapTool

#ifndef vA_H
#define vA_H

//QT4 includes
#include <QObject>

//QGIS includes
#include <qgisapp.h>
#include <qgsmaptool.h>
#include <qgsmapcanvas.h>
#include<qgspoint.h>
#include "../qgisplugin.h"
#include<QToolBar>
//#include "vARubberBand.h"

//forward declarations

//class QToolBar;
class vARubberBand;
/**
* \class Plugin
* \brief [name] plugin for QGIS
* [description]
*/
class vA1:public QgsMapTool , public QgisPlugin
{
  Q_OBJECT;
  public:
  vA1(QgisApp * theApplication, QgisIface * theInterface);
  //! Destructor
  virtual ~vA1();

	//! inherited from QgsMapTool

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part of output is

g++ -DHAVE_CONFIG_H -I. -I. -I../../.. -g -O2 -DQT3_SUPPORT -I/usr/local/Trolltech/Qt-4.1.2//mkspecs/default -I/usr/local/Trolltech/Qt-4.1.2//include/Qt3Support -I/usr/local/Trolltech/Qt-4.1.2//include/QtCore -I/usr/local/Trolltech/Qt-4.1.2//include/QtDesigner -I/usr/local/Trolltech/Qt-4.1.2//include/QtGui -I/usr/local/Trolltech/Qt-4.1.2//include/QtNetwork -I/usr/local/Trolltech/Qt-4.1.2//include/QtOpenGL -I/usr/local/Trolltech/Qt-4.1.2//include/QtSql -I/usr/local/Trolltech/Qt-4.1.2//include/QtXml -I/usr/local/Trolltech/Qt-4.1.2//include -I/usr/local/Trolltech/Qt-4.1.2//include/QtSvg -I/usr/local/Trolltech/Qt-4.1.2//include/QtTest -I/usr/local/Trolltech/Qt-4.1.2//include/QtDesigner -D_REENTRANT -DQT_THREAD_SUPPORT -DNO_DEBUG -I/usr/local/include -I/usr/include -I../../core -I../../ui -I../../gui -I../../raster -g -O2 -MT libqgis_plugin_va_la-va.lo -MD -MP -MF .deps/libqgis_plugin_va_la-va.Tpo -c va.cpp -fPIC -DPIC -o .libs/libqgis_plugin_va_la-va.o
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qmenubar.h:29: error: expected initializer before 'QtGuiModule'
va.cpp: In member function 'virtual void vA1::initGui()':
va.cpp:98: error: no matching function for call to 'QAction::QAction(QIcon, const char [4], vA1* const)'
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:173: note: candidates are: QAction::QAction(const QAction&)
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:73: note: QAction::QAction(const QIcon&, const QString&, const QKeySequence&, QObject*, const char*)
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:70: note: QAction::QAction(const QString&, const QKeySequence&, QObject*, const char*)
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:68: note: QAction::QAction(QObject*, const char*)
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:65: note: QAction::QAction(const QIcon&, const QString&, QObject*)
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:64: note: QAction::QAction(const QString&, QObject*)
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:63: note: QAction::QAction(QObject*)

This code is part of a os project so i will not be in a position to post all code. But what i have figured out is it has got something to do with inclusion of some header files.

Similar code is working fine but i am caught here.

regards
quickNitin

**wysota** · 30th August 2006, 09:41

What does your project file look like?

**quickNitin** · 30th August 2006, 10:04

there is no pro file in my code.
As i told earlier this code is part of a open souce gis qgis.There is a perl sript which make changes in major configuration files so i am not worried about them. And it was working fine for earlier work.

Only this time it has stuck. I am not aware about need of project file.
Also before that it was giving me problem with following code

Qt Code:

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#
nclude <qgisapp.h>
#
#include <qgsmaptool.h>
#
#include <qgsmapcanvas.h>
#
#include<qgspoint.h>
#
#include "../qgisplugin.h"
#
//#include<QToolBar> [COLOR="Red"]no inclusion of QToolBar headers[/COLOR]
#
//#include "vARubberBand.h"
#
 
#
//forward declarations
#
 
#
class QToolBar; [COLOR="Red"]FORWARD DECLARATION OF CLASS
#[/COLOR]
class vARubberBand;
#
/**
#
* \class Plugin
#
* \brief [name] plugin for QGIS
#
* [description]
#
*/
#
class vA1:public QgsMapTool , public QgisPlugin
#
{
#
  Q_OBJECT;
#
  public:
#
  vA1(QgisApp * theApplication, QgisIface * theInterface);
#
  //! Destructor
#
  virtual ~vA1();
#
 
#
    //! inherited from QgsMapTool

#
nclude <qgisapp.h>
#
#include <qgsmaptool.h>
#
#include <qgsmapcanvas.h>
#
#include<qgspoint.h>
#
#include "../qgisplugin.h"
#
//#include<QToolBar> [COLOR="Red"]no inclusion of QToolBar headers[/COLOR]
#
//#include "vARubberBand.h"
#
 
#
//forward declarations
#
 
#
class QToolBar; [COLOR="Red"]FORWARD DECLARATION OF CLASS
#[/COLOR]
class vARubberBand;
#
/**
#
* \class Plugin
#
* \brief [name] plugin for QGIS
#
* [description]
#
*/
#
class vA1:public QgsMapTool , public QgisPlugin
#
{
#
  Q_OBJECT;
#
  public:
#
  vA1(QgisApp * theApplication, QgisIface * theInterface);
#
  //! Destructor
#
  virtual ~vA1();
#
 
#
    //! inherited from QgsMapTool

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It was reporting about some multiple declarations

regards
quickNitin

**danadam** · 30th August 2006, 10:22

Originally Posted by quickNitin

there is no pro file in my code.

That's not good

This line in qmenubar.h:

Qt Code:

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usr/local/Trolltech/Qt-4.1.2//include/QtGui/qmenubar.h:29: error: expected initializer before 'QtGuiModule'

usr/local/Trolltech/Qt-4.1.2//include/QtGui/qmenubar.h:29: error: expected initializer before 'QtGuiModule'

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is calling macro (it's in qglobal.h):

Qt Code:

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QT_MODULE(Gui)

QT_MODULE(Gui)

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which translates to:

Qt Code:

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typedef QtValidLicenseForGuiModule QtGuiModule

typedef QtValidLicenseForGuiModule QtGuiModule

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But QtValidLicenseForGuiModule is defined only if QT_LICENSED_MODULE(Gui) macro is called. And this macro is called only if expression:

Qt Code:

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QT_EDITION & QT_MODULE_GUI

QT_EDITION & QT_MODULE_GUI

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evaluates to true. It evaluates to true only if QT_EDITION equals QT_EDITION_DESKTOPLIGHT or QT_EDITION_OPENSOURCE or QT_EDITION_DESKTOP. And QT_EDITION will be set to QT_EDITION_DESKTOP if you ie. build your project in a standard way:

Qt Code:

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qmake -project
qmake
make

qmake -project
qmake
make

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**quickNitin** · 30th August 2006, 10:36

well i accept my arrogance of this aspect and insufficient knowledge of Qt. I will work on it.
project file generated is as

Qt Code:

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######################################################################
# Automatically generated by qmake (1.07a) Wed Aug 30 15:08:08 2006
######################################################################
 
TEMPLATE = app
INCLUDEPATH += .
 
# Input
HEADERS += ui_vaguibase.h \
           va.h \
           vagui.h \
           vaguibase.ui.h \
           vaRubberBand.h \
           vARubberBand.h \
           vATool.h
INTERFACES += vaguibase.ui
SOURCES += va.cpp va.moc.cpp va.qrc.cpp vagui.cpp vagui.moc.cpp vARubberBand.cpp

######################################################################
# Automatically generated by qmake (1.07a) Wed Aug 30 15:08:08 2006
######################################################################

TEMPLATE = app
INCLUDEPATH += .

# Input
HEADERS += ui_vaguibase.h \
           va.h \
           vagui.h \
           vaguibase.ui.h \
           vaRubberBand.h \
           vARubberBand.h \
           vATool.h
INTERFACES += vaguibase.ui
SOURCES += va.cpp va.moc.cpp va.qrc.cpp vagui.cpp vagui.moc.cpp vARubberBand.cpp

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but it is still giving same output.

**danadam** · 30th August 2006, 11:02

Originally Posted by quickNitin

but it is still giving same output.

Really? Is "qmenubar.h:29: error: expected initializer before 'QtGuiModule'" still there? Well, in that case I have no more ideas what the solution could be.

As far as the second error is concerned:

Qt Code:

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va.cpp: In member function 'virtual void vA1::initGui()':
va.cpp:98: error: no matching function for call to 'QAction::QAction(QIcon, const char [4], vA1* const)'
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:173: note: candidates are: QAction::QAction(const QAction&)
...

va.cpp: In member function 'virtual void vA1::initGui()':
va.cpp:98: error: no matching function for call to 'QAction::QAction(QIcon, const char [4], vA1* const)'
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:173: note: candidates are: QAction::QAction(const QAction&)
...

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It seems that in line 98 of va.cpp you are calling QAction constructor, but with wrong parameters. There is no QAction(QIcon, const char [4], vA1* const) constructor (at least according to compiler

) and it gives you a list of similar ones, which exist.

**quickNitin** · 30th August 2006, 11:12

about QAction constructor error i had checked arguments do match and constructor also exists but it is giving me this error.
Here is snap of that code

Qt Code:

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void vA1::initGui()
{
 
  // Create the action for tool
  mQActionPointer = new QAction(QIcon(":/va/va.png"),"vA1", this);
  // Set the what's this text

void vA1::initGui()
{

  // Create the action for tool
  mQActionPointer = new QAction(QIcon(":/va/va.png"),"vA1", this);
  // Set the what's this text

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At http://doc.trolltech.com/4.1/qaction.html i found this

Qt Code:

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Public Functions
 
      QAction ( QObject * parent )
 
      QAction ( const QString & text, QObject * parent )
 
      [COLOR="Blue"]QAction ( const QIcon & icon, const QString & text, QObject * parent )
    [/COLOR]
      ~QAction ()

Public Functions
    
      QAction ( QObject * parent )
    
      QAction ( const QString & text, QObject * parent )
    
      [COLOR="Blue"]QAction ( const QIcon & icon, const QString & text, QObject * parent )
    [/COLOR]
      ~QAction ()

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About my other issue i request experienced users to guide me in this.

**quickNitin** · 30th August 2006, 11:47

for isssue

Qt Code:

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va.cpp: In member function 'virtual void vA1::initGui()':
 
      va.cpp:98: error: no matching function for call to 'QAction::QAction(QIcon, const char [4], vA1* const)'
 
      /usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:173: note: candidates are: QAction::QAction(const QAction&)
 
      ...

va.cpp: In member function 'virtual void vA1::initGui()':
  
      va.cpp:98: error: no matching function for call to 'QAction::QAction(QIcon, const char [4], vA1* const)'
  
      /usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:173: note: candidates are: QAction::QAction(const QAction&)
  
      ...

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i found that i hadn't included QObject class which i did so up mentioned error went away.

About second issue of

Qt Code:

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usr/local/Trolltech/Qt-4.1.2//include/QtGui/qmenubar.h:29: error: expected initializer before 'QtGuiModule'

usr/local/Trolltech/Qt-4.1.2//include/QtGui/qmenubar.h:29: error: expected initializer before 'QtGuiModule'

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i changed my header file as

Qt Code:

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#ifndef vA_H
#define vA_H
 
//QT4 includes
#include <QObject>
 
//QGIS includes
#include <qgisapp.h>
#include <qgsmaptool.h>
#include <qgsmapcanvas.h>
#include<qgspoint.h>
#include "../qgisplugin.h"
 
#include "vARubberBand.h"
;
//forward declarations
 
class QToolBar;// LINE NO 54
 
/**
* \class Plugin
* \brief [name] plugin for QGIS
* [description]
*/
class vA1:public QObject, public QgsMapTool , public QgisPlugin
{
  Q_OBJECT;
  public:

#ifndef vA_H
#define vA_H

//QT4 includes
#include <QObject>

//QGIS includes
#include <qgisapp.h>
#include <qgsmaptool.h>
#include <qgsmapcanvas.h>
#include<qgspoint.h>
#include "../qgisplugin.h"

#include "vARubberBand.h"
;
//forward declarations

class QToolBar;// LINE NO 54

/**
* \class Plugin
* \brief [name] plugin for QGIS
* [description]
*/
class vA1:public QObject, public QgsMapTool , public QgisPlugin
{
  Q_OBJECT;
  public:

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i think you will be noticing the semicolon after line

Qt Code:

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#include "vARubberBand.h"

#include "vARubberBand.h"

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, this is what i did a sort of hit and trial to compile it. It did. If i didn't put this semicolon it give the message

Qt Code:

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va.cpp line 54: multiple types in one declaration

va.cpp line 54: multiple types in one declaration

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i donot have reasoning for such behaviour. Kindly anyone put some light on this issue. All comments, suggestion and other solutions are welcome

reagrds
quickNitin

**jacek** · 30th August 2006, 11:51

Originally Posted by quickNitin

va.cpp line 54: multiple types in one declaration

i donot have reasoning for such behaviour.

Just add the missing semicolon after your class definition.

**quickNitin** · 30th August 2006, 12:21

thanks jacek!. I couldn't even imagine that this isssue was there.

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