Resiving signal from qml

mehrdad

i want to receive a string from my qml file...all that i do is copying this two codes from sub url in my program and including libraries...
"this link!!!":http://qt-project.org/doc/qt-4.8/qtbinding.html#receiving-signals
but this error occur...
undefined refrence to 'Vtable fo My class'

i think its because cpp code line 13-in addressing qml file...
@// MyItem.qml
import QtQuick 1.0

Item {
id: item
width: 100; height: 100

 signal qmlSignal(string msg)

 MouseArea {
     anchors.fill: parent
     onClicked: item.qmlSignal("Hello from QML")
 }

}
@
@class MyClass : public QObject
{
Q_OBJECT
public slots:
void cppSlot(const QString &msg) {
qDebug() << "Called the C++ slot with message:" << msg;
}
};

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

 QDeclarativeView view(QUrl::fromLocalFile&#40;"MyItem.qml"&#41;);
 QObject *item = view.rootObject();

 MyClass myClass;
 QObject::connect(item, SIGNAL(qmlSignal(QString)),
                  &myClass, SLOT(cppSlot(QString)));

 view.show();
 return app.exec();

}@

and this is my comple output

22:00:15: Running build steps for project untitled5...
22:00:15: Configuration unchanged, skipping qmake step.
22:00:15: Starting: "C:\Qt\qtcreator-2.4.0\mingw\bin\mingw32-make.exe"
C:/Qt/qtcreator-2.4.0/mingw/bin/mingw32-make.exe -f Makefile.Debug
mingw32-make.exe[1]: Entering directory C:/Qt/qtcreator-2.4.0/untitled5-build-desktop-Qt_4_8_0__4_8_0__Debug' g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DECLARATIVE_DEBUG -DQT_DLL -DQT_DECLARATIVE_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\4.8.0\include\QtCore" -I"..\..\4.8.0\include\QtGui" -I"..\..\4.8.0\include\QtDeclarative" -I"..\..\4.8.0\include" -I"..\untitled5\qmlapplicationviewer" -I"..\..\4.8.0\include\ActiveQt" -I"debug" -I"..\untitled5" -I"." -I"..\..\4.8.0\mkspecs\win32-g++" -o debug\main.o ..\untitled5\main.cpp g++ -mthreads -Wl,-subsystem,windows -o debug\untitled5.exe debug/main.o debug/qmlapplicationviewer.o debug/moc_qmlapplicationviewer.o -L"c:\Qt\4.8.0\lib" -lmingw32 -lqtmaind -lQtDeclaratived4 -lQtGuid4 -lQtCored4 mingw32-make.exe[1]: Leaving directory C:/Qt/qtcreator-2.4.0/untitled5-build-desktop-Qt_4_8_0__4_8_0__Debug'
debug/main.o: In function MyClass': C:\Qt\qtcreator-2.4.0\untitled5-build-desktop-Qt_4_8_0__4_8_0__Debug/../untitled5/main.cpp:5: undefined reference to vtable for MyClass'
debug/main.o: In function ~MyClass': C:\Qt\qtcreator-2.4.0\untitled5-build-desktop-Qt_4_8_0__4_8_0__Debug/../untitled5/main.cpp:5: undefined reference to vtable for MyClass'
collect2: ld returned 1 exit status
mingw32-make.exe[1]: *** [debug\untitled5.exe] Error 1
mingw32-make.exe: *** [debug] Error 2
22:00:17: The process "C:\Qt\qtcreator-2.4.0\mingw\bin\mingw32-make.exe" exited with code 2.
Error while building project untitled5 (target: Desktop)
When executing build step 'Make'

i cant fix it!
help????please?????

gimble

See this thread:
http://qt-project.org/forums/viewthread/6084

You'll find it extremely similar and helpful.

I found it by Googling "undefined reference to `vtable for MyClass’"

Google == friend