strange QT error out of nowhere

[Penut]

Hi!

I was using QT 4.4 and Ogre3D 1.4.9 to create a level editor in visual studio 8. I was able to get an Ogre window up and running as a widget and got some more features working. However, this morning all of a sudden it started giving me some MOC errors on the Ogre widget cpp file out of nowhere. I retraced my steps and took out the new changes but the error did not seem to go away.

Just for the heck of it, I started a project from scratch and pasted a fresh block of code (just to get basic ogre window up and running, this worked the last time) and I keep getting similar error. I checked the Ogre log and it is blank...which means Ogre never initialized at all.

Here are the errors I am getting:

1>------ Build started: Project: WorldBuilder, Configuration: Debug Win32 ------
1>Moc'ing ogrewidget.h...
1>Uic'ing d:\My Documents\Projects\Ogre3D\WorldBuilder\WorldBuilde r\worldbuilder.ui...
1>Moc'ing worldbuilder.h...
1>Compiling...
1>main.cpp
1>worldbuilder.cpp
1>ogrewidget.cpp
1>Generating Code...
1>Compiling...
1>moc_ogrewidget.cpp
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(37) : error C3083: 'OgreWidget': the symbol to the left of a '::' must be a type
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(37) : error C2039: 'staticMetaObject' : is not a member of 'Ogre'
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(42) : error C3083: 'OgreWidget': the symbol to the left of a '::' must be a type
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(42) : error C2039: 'metaObject' : is not a member of 'Ogre'
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(43) : error C2270: 'metaObject' : modifiers not allowed on nonmember functions
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(47) : error C3083: 'OgreWidget': the symbol to the left of a '::' must be a type
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(47) : error C2039: 'qt_metacast' : is not a member of 'Ogre'
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(51) : error C2673: 'qt_metacast' : global functions do not have 'this' pointers
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(52) : error C2352: 'QWidget::qt_metacast' : illegal call of non-static member function
1> c:\qt\4.4.0\src\gui\kernel\qwidget.h(122) : see declaration of 'QWidget::qt_metacast'
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(55) : error C3083: 'OgreWidget': the symbol to the left of a '::' must be a type
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(55) : error C2039: 'qt_metacall' : is not a member of 'Ogre'
1>d:\my documents\projects\ogre3d\worldbuilder\worldbuilde r\generatedfiles\debug\moc_ogrewidget.cpp(57) : error C2352: 'QWidget::qt_metacall' : illegal call of non-static member function
1> c:\qt\4.4.0\src\gui\kernel\qwidget.h(122) : see declaration of 'QWidget::qt_metacall'
1>Build log was saved at "file://d:\My Documents\Projects\Ogre3D\WorldBuilder\WorldBuilde r\Debug\BuildLog.htm"
1>WorldBuilder - 12 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========


Here ar ethe only two files that I have added to the basic QT project: (then I created a widget in the .ui file and promoted it to OgreWidget)

OgreWidget.h

#ifndef OGREWIDGET_H_
#define OGREWIDGET_H_
 
#include <QWidget>
 
#include <Ogre.h>
 
class OgreWidget : public QWidget
{
Q_OBJECT
 
public:
OgreWidget(QWidget* parent);
~OgreWidget();
 
protected:
void paintEvent(QPaintEvent* evt);
void resizeEvent(QResizeEvent* evt);
void timerEvent(QTimerEvent* evt);
 
void refresh();
 
private:
Ogre::Root* root;
Ogre::SceneManager* sceneManager;
Ogre::RenderWindow* window;
Ogre::Camera* cam;
};
 
#endif /*OGREWIDGET_H_*/

#ifndef OGREWIDGET_H_
#define OGREWIDGET_H_

#include <QWidget>

#include <Ogre.h>

class OgreWidget : public QWidget
{
Q_OBJECT

public:
OgreWidget(QWidget* parent);
~OgreWidget();

protected:
void paintEvent(QPaintEvent* evt);
void resizeEvent(QResizeEvent* evt);
void timerEvent(QTimerEvent* evt);

void refresh();

private:
Ogre::Root* root;
Ogre::SceneManager* sceneManager;
Ogre::RenderWindow* window;
Ogre::Camera* cam;
};

#endif /*OGREWIDGET_H_*/

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OgreWidget.cpp

#include "ogrewidget.h"
 
#include <QMouseEvent>
 
OgreWidget::OgreWidget(QWidget* parent) : QWidget(parent, Qt::MSWindowsOwnDC)
{
setAttribute(Qt::WA_PaintOnScreen);
setAttribute(Qt::WA_NoBackground);
 
root = 0;
sceneManager = 0;
window = 0;
cam = 0;
}
 
OgreWidget::~OgreWidget()
{
}
 
void OgreWidget::paintEvent(QPaintEvent* evt)
{
if(!window)
{
using namespace Ogre;
 
Ogre::NameValuePairList params;
WId wid = winId();
params["externalWindowHandle"] = Ogre::StringConverter::toString((size_t)wid);
 
// This doesn't actually work anymore. Look at the Qt Ogre model viewer for how to do this.
#if !defined(Q_WS_WIN)
char buf[64];
sprintf(buf, "SDL_WINDOWID=0x%1x", wid);
putenv(buf);
#endif
 
root = new Ogre::Root();
 
root->loadPlugin("RenderSystem_GL_d");
 
Ogre::RenderSystemList *list = root->getAvailableRenderers();
Ogre::RenderSystemList::iterator i = list->begin();
 
while (i != list->end())
{
if ((*i)->getName() == "OpenGL Rendering Subsystem")
{
root->setRenderSystem(*(i));
break;
}
 
i++;
}
 
root->initialise(false);
 
window = root->createRenderWindow("OgreWindow", width(), height(), false, &params);
sceneManager = root->createSceneManager(Ogre::ST_GENERIC);
 
ResourceGroupManager::getSingleton().initialiseAllResourceGroups();
 
cam = sceneManager->createCamera("Cam");
 
window->addViewport(cam)->setBackgroundColour(Ogre::ColourValue::Black);
 
cam->setPosition(0, 150, 100);
cam->lookAt(0, 150, 0);
 
startTimer(60);
}
 
refresh();
}
 
void OgreWidget::resizeEvent(QResizeEvent* evt)
{
if(window)
{
window->resize(width(), height());
window->windowMovedOrResized();
cam->setAspectRatio(Ogre::Real(window->getViewport(0)->getActualWidth()) / Ogre::Real(window->getViewport(0)->getActualHeight()));
}
}
 
void OgreWidget::timerEvent(QTimerEvent* evt)
{
refresh();
}
 
void OgreWidget::refresh()
{
Ogre::Root::getSingleton()._fireFrameStarted();
window->update();
Ogre::Root::getSingleton()._fireFrameEnded();
}

#include "ogrewidget.h"

#include <QMouseEvent>

OgreWidget::OgreWidget(QWidget* parent) : QWidget(parent, Qt::MSWindowsOwnDC)
{
setAttribute(Qt::WA_PaintOnScreen);
setAttribute(Qt::WA_NoBackground);

root = 0;
sceneManager = 0;
window = 0;
cam = 0;
}

OgreWidget::~OgreWidget()
{
}

void OgreWidget::paintEvent(QPaintEvent* evt)
{
if(!window)
{
using namespace Ogre;

Ogre::NameValuePairList params;
WId wid = winId();
params["externalWindowHandle"] = Ogre::StringConverter::toString((size_t)wid);

// This doesn't actually work anymore. Look at the Qt Ogre model viewer for how to do this.
#if !defined(Q_WS_WIN)
char buf[64];
sprintf(buf, "SDL_WINDOWID=0x%1x", wid);
putenv(buf);
#endif

root = new Ogre::Root();

root->loadPlugin("RenderSystem_GL_d");

Ogre::RenderSystemList *list = root->getAvailableRenderers();
Ogre::RenderSystemList::iterator i = list->begin();

while (i != list->end())
{
if ((*i)->getName() == "OpenGL Rendering Subsystem")
{
root->setRenderSystem(*(i));
break;
}

i++;
}

root->initialise(false);

window = root->createRenderWindow("OgreWindow", width(), height(), false, &params);
sceneManager = root->createSceneManager(Ogre::ST_GENERIC);

ResourceGroupManager::getSingleton().initialiseAllResourceGroups();

cam = sceneManager->createCamera("Cam");

window->addViewport(cam)->setBackgroundColour(Ogre::ColourValue::Black);

cam->setPosition(0, 150, 100);
cam->lookAt(0, 150, 0);

startTimer(60);
}

refresh();
}

void OgreWidget::resizeEvent(QResizeEvent* evt)
{
if(window)
{
window->resize(width(), height());
window->windowMovedOrResized();
cam->setAspectRatio(Ogre::Real(window->getViewport(0)->getActualWidth()) / Ogre::Real(window->getViewport(0)->getActualHeight()));
}
}

void OgreWidget::timerEvent(QTimerEvent* evt)
{
refresh();
}

void OgreWidget::refresh()
{
Ogre::Root::getSingleton()._fireFrameStarted();
window->update();
Ogre::Root::getSingleton()._fireFrameEnded();
}

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contents of moc_ogrewidget.cpp

/****************************************************************************
** Meta object code from reading C++ file 'ogrewidget.h'
**
** Created: Tue Aug 12 02:00:54 2008
** by: The Qt Meta Object Compiler version 59 (Qt 4.4.0)
**
** WARNING! All changes made in this file will be lost!
*****************************************************************************/
 
#include "../../Source/ogrewidget.h"
#if !defined(Q_MOC_OUTPUT_REVISION)
#error "The header file 'ogrewidget.h' doesn't include <QObject>."
#elif Q_MOC_OUTPUT_REVISION != 59
#error "This file was generated using the moc from 4.4.0. It"
#error "cannot be used with the include files from this version of Qt."
#error "(The moc has changed too much.)"
#endif
 
QT_BEGIN_MOC_NAMESPACE
static const uint qt_meta_data_Ogre__OgreWidget[] = {
 
// content:
1, // revision
0, // classname
0, 0, // classinfo
0, 0, // methods
0, 0, // properties
0, 0, // enums/sets
 
0 // eod
};
 
static const char qt_meta_stringdata_Ogre__OgreWidget[] = {
"Ogre::OgreWidget\0"
};
 
const QMetaObject Ogre::OgreWidget::staticMetaObject = {
{ &QWidget::staticMetaObject, qt_meta_stringdata_Ogre__OgreWidget,
qt_meta_data_Ogre__OgreWidget, 0 }
};
 
const QMetaObject *Ogre::OgreWidget::metaObject() const
{
return &staticMetaObject;
}
 
void *Ogre::OgreWidget::qt_metacast(const char *_clname)
{
if (!_clname) return 0;
if (!strcmp(_clname, qt_meta_stringdata_Ogre__OgreWidget))
return static_cast<void*>(const_cast< OgreWidget*>(this));
return QWidget::qt_metacast(_clname);
}
 
int Ogre::OgreWidget::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
{
_id = QWidget::qt_metacall(_c, _id, _a);
if (_id < 0)
return _id;
return _id;
}
QT_END_MOC_NAMESPACE

/****************************************************************************
** Meta object code from reading C++ file 'ogrewidget.h'
**
** Created: Tue Aug 12 02:00:54 2008
** by: The Qt Meta Object Compiler version 59 (Qt 4.4.0)
**
** WARNING! All changes made in this file will be lost!
*****************************************************************************/

#include "../../Source/ogrewidget.h"
#if !defined(Q_MOC_OUTPUT_REVISION)
#error "The header file 'ogrewidget.h' doesn't include <QObject>."
#elif Q_MOC_OUTPUT_REVISION != 59
#error "This file was generated using the moc from 4.4.0. It"
#error "cannot be used with the include files from this version of Qt."
#error "(The moc has changed too much.)"
#endif

QT_BEGIN_MOC_NAMESPACE
static const uint qt_meta_data_Ogre__OgreWidget[] = {

// content:
1, // revision
0, // classname
0, 0, // classinfo
0, 0, // methods
0, 0, // properties
0, 0, // enums/sets

0 // eod
};

static const char qt_meta_stringdata_Ogre__OgreWidget[] = {
"Ogre::OgreWidget\0"
};

const QMetaObject Ogre::OgreWidget::staticMetaObject = {
{ &QWidget::staticMetaObject, qt_meta_stringdata_Ogre__OgreWidget,
qt_meta_data_Ogre__OgreWidget, 0 }
};

const QMetaObject *Ogre::OgreWidget::metaObject() const
{
return &staticMetaObject;
}

void *Ogre::OgreWidget::qt_metacast(const char *_clname)
{
if (!_clname) return 0;
if (!strcmp(_clname, qt_meta_stringdata_Ogre__OgreWidget))
return static_cast<void*>(const_cast< OgreWidget*>(this));
return QWidget::qt_metacast(_clname);
}

int Ogre::OgreWidget::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
{
_id = QWidget::qt_metacall(_c, _id, _a);
if (_id < 0)
return _id;
return _id;
}
QT_END_MOC_NAMESPACE

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I'd greatly appreciate any help at all!

[wysota]

Looks like the Ogre.h include failed. Check that it indeed gets included.

[Penut]

Well I can open Ogre.h by right clicking on #include <Ogre.h>. Besides I have not made a change to that ever since I wrote it.

I do not know any way of checking if the file was included until actually I have a window running of some sort. My program does not even compile now.

[lyuts]

Show your .pro file. Do you modify include path?

[wysota]

Well I can open Ogre.h by right clicking on #include <Ogre.h>.

It only means your Visual Studio can find the file, not that it is actually included in the build.

I do not know any way of checking if the file was included until actually I have a window running of some sort.

That's not very good You can enable some verbosity options for your compiler or something.

[Penut]

turns out it was related to windows. a simple reboot solved it!

But I've learned something from all this....#1 always reboot when there occurs a problem even after you didnt change anything since the last successful build.....and #2...the more important one is how to turn on the compiler feature to access debug variables without outputting them to a window

thank you everyone for your replies