Hello, I have some problem - I cannot use a variable from other class.
For example I have in class Setts QSpinBox SB1 and int i. I would like to check value of 'i' and set value of SB1 in method in class Pac.
I tried Setts::set_ui->SB1->setValue(1); but I got error: object missing in reference to 'Setts::set_ui'

setts.h
Qt Code: 
  1. #include <QSpinBox>
  2. #include "ui_setts.h>
  3.  
  4. namespace Ui {
  5.     class Setts;
  6. }
  7.  
  8. class Setts : public QDialog {
  9.     Q_OBJECT
  10. public:
  11.     Setts(QWidget *parent = 0);
  12.     ~Setts();
  13.    Ui::Setts *set_ui;
  14.  
  15. protected:
  16.     void changeEvent(QEvent *e);
  17.  
  18. private:
  19.    QSpinBox *SB1;
  20.    int i;
  21. }
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setts.cpp
Qt Code: 
  1. #include "setts.h"
  2. #include "ui_setts.h"
  3.  
  4. Setts::Setts(QWidget *parent) :
  5.     QDialog(parent),
  6.     set_ui(new Ui::Setts)
  7.  
  8. {
  9.     set_ui->setupUi(this);
  10.     this->showFullScreen();
  11. }
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Thanks in advanced
Przemek