c++ - Emitting a signal not working properly -

i have class called dosecalibration contains dosecalibration.cpp , dosecalibration.h. class associated separate ui form. on form, when button clicked, signal emitted.

there connection within main window receive signal, doesn't seem working. code following:

dosecalibration.h :

#ifndef dosecalibration_h #define dosecalibration_h  #include <qdialog> #include <qdebug>     namespace ui { class dosecalibration; }  class dosecalibration : public qdialog {     q_object  public:     explicit dosecalibration(qwidget *parent = 0);     ~dosecalibration();      double dosefactor;     //bool dose;  private slots:     void on_usecharge_clicked();      void on_usecounts_clicked();      void on_pushbutton_clicked();  //    void on_pcsb_valuechanged();  //    void on_countssb_valuechanged();  signals:     void applydose();   private:        ui::dosecalibration *ui; };  #endif // dosecalibration_h 

dosecalibration.cpp :

#include "dosecalibration.h" #include "ui_dosecalibration.h"  dosecalibration::dosecalibration(qwidget *parent) :     qdialog(parent),     ui(new ui::dosecalibration) {     ui->setupui(this);     ui->countssb->setenabled(false);     ui->countssb->setvalue(ui->pcsb->value()*100/9.6); }  dosecalibration::~dosecalibration() {     delete ui; }   void dosecalibration::on_usecharge_clicked() {     ui->countssb->setenabled(false);     ui->pcsb->setenabled(true); }  void dosecalibration::on_usecounts_clicked() {     ui->pcsb->setenabled(false);     ui->countssb->setenabled(true); }  void dosecalibration::on_pushbutton_clicked() {      if(ui->usecharge->ischecked()){         dosefactor = ui->pcsb->value();      }     else if(ui->usecounts->ischecked()){         dosefactor = ui->countssb->value();     }     emit applydose(); }  //void dosecalibration::on_pcsb_valuechanged() //{ //    ui->countssb->setvalue(ui->pcsb->value()*100/9.6); //}  //void dosecalibration::on_countssb_valuechanged() //{ //    ui->pcsb->setvalue(ui->countssb->value()*9.6/100); //} 

and mainwindow.h (only included 'includes' , slots):

#ifndef mainwindow_h #define mainwindow_h  #include <afe_variables.h> #include <qmainwindow>  #include "fpga/fpga.h" #include "fpga/okfrontpaneldll.h" #include "decoder.h" #include "analysis.h" #include "about.h" #include "logfile.h" #include "graph/graphicsscene.h" #include "graph/graphdialog.h" #include "graph/qcustomplot.h" #include "graph/graphicsview.h" #include "settingsdialog.h" #include "dosecalibration.h"  #include <qfiledialog> #include <qprogressbar> #include <qgraphicsscene> #include <qgraphicsrectitem> #include <qgraphicstextitem> #include <qdialog> #include <qdebug> #include <math.h>  slots:      //dose calibration      void initialisegraphsafterdose();     void on_actiondose_calibration_4_triggered();     //void dosecalibrationenabled(); private:     //initalisation     void onstart();     void allocatememory();     void connectfpga();     bool checkconnection();     ui::mainwindow *ui;     okcfrontpanel *xem;     fpga *fpga;     qprogressbar *progressbar;     qtimer *playtimer;      logfile *logfiledialog;     logfile *logfileanalysis;     qstring loadlogfilepath;      dosecalibration *dose; 

and snippet graphing.cpp, part of main window class:

    //connects dose calibration      dose = new dosecalibration(this);     connect(dose,signal(applydose()),this,slot(initialisegraphsafterdose()));  }  void mainwindow::initialisegraphsafterdose() {     apply_dose = true;     initialisegraphs();     qdebug() << apply_dose; } 

so applydose() signal emitted @ push of button in dosecalibration ui. connect should mean value of apply_dose sent console, nothing displayed.

edit:

placing connect within if statement determine if connecting confirms indeed working correctly.

    //connects dose calibration      dose = new dosecalibration(this);     if(connect(dose,signal(applydose()),this,slot(initialisegraphsafterdose())))     {         qdebug() << "connect worked";     }  } 

the code above outputs message confirming connect.

any idea?

remove multiple instances of dosecalibration, or make sure connect each 1 of those, if need multiple instances.