Qt Code: 
  1. MainWindow::MainWindow(QWidget *parent) :
  2.     QMainWindow(parent),
  3.     ui(new Ui::MainWindow)
  4. {
  5.     ui->setupUi(this);
  6. #ifdef TRACE
  7.     std::cout <<"TRACE START  MainWindow Constructor File  "<< __FILE__ << " Function " <<__FUNCTION__<<" @line  "<< __LINE__<< std::endl;
  8. #endif
  9.     BT_FormDeviceInquiry *deviceIquiry = new BT_FormDeviceInquiry();
  10.     if(connect(deviceIquiry,SIGNAL(sendStatus(QString)),this,SLOT(displayStatusMessage(QString))))
  11.          std::cout <<"SUCCESS SIGNALS / SLOTS CONNECTED "<< std::endl;
  12.     else
  13.     {
  14.        std::cout <<"******************************************************FAILED CONNECTION " <<std::endl;
  15.        exit(-1);
  16.     }
  17. #ifdef TRACE
  18.     std::cout <<"TRACE END  MainWindow Constructor File  "<< __FILE__ << " Function " <<__FUNCTION__<<" @line  "<< __LINE__<< std::endl;
  19. #endif
  20. }
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Does not get called
Qt Code: 
  1. void MainWindow::displayStatusMessage( const QString & message )
  2. {
  3. #ifdef TRACE
  4.     std::cout <<"TRACE  \nFile  "<< __FILE__ << "\nFunction " <<__FUNCTION__<<" \n@line  "<< __LINE__<< std::endl;
  5. #endif
  6.     /*
  7.     QStatusBar * pStatusBar = statusBar();
  8.     pStatusBar->showMessage( message, 5000 );  // A 5 second timeout
  9.     */
  10.  
  11.     ui->statusbar->showMessage(message,5000);
  12. }
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slot declaration in MainWIndow
Qt Code: 
  1. int WriteStatus(const QString *message);
  2.  //   int WriteStatus(char *message);
  3.  
  4. public slots:
  5.     void displayStatusMessage( const QString & message );
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emit signal - using TRACE to verify execution
Qt Code: 
  1. void BT_FormDeviceInquiry::scanFinished()
  2. {
  3. #ifdef TRACE
  4.     std::cout <<"TRACE \nFunction  "<< __FUNCTION__ << "\nFile " << __FILE__<< "\n@Line # "<< __LINE__<< std::endl;
  5. #endif
  6.  
  7. #ifdef BYPASS
  8.     CurrentTime();
  9.     QString text = "STATE start scan for near-by BT devices finished ";
  10.     StatusBar(&text);
  11. #endif
  12.  
  13.     ui->scan->setEnabled(true); // TODO does not re_enable button 
  14.  
  15.     // test signal
  16. #ifdef TRACE
  17.     std::cout <<"TRACE START emit sendStatus \nFunction  "<< __FUNCTION__ << "\nFile " << __FILE__<< "\n@Line # "<< __LINE__<< std::endl;
  18. #endif
  19.  
  20.     emit sendStatus( "Status from SomeMethod" );
  21.  
  22. #ifdef TRACE
  23.     std::cout <<"TRACE END emit sendStatus \nFunction  "<< __FUNCTION__ << "\nFile " << __FILE__<< "\n@Line # "<< __LINE__<< std::endl;
  24. #endif
  25.  
  26. }
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declaration of signal
Qt Code: 
  1. public:
  2.     // 82920202
  3.     int TestFunction();
  4.     // declare signal
  5. signals:
  6.   void sendStatus( const QString & status );
  7.  
  8. // CCC chnaged to publick private:
  9. public:
  10.     QBluetoothDeviceDiscoveryAgent *discoveryAgent;
  11.     QBluetoothLocalDevice *localDevice;
  12.     Ui_DeviceDiscovery *ui;
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