hi all,

previously I posted a question on multiple forms handling. However no one replied. Anyway, I hope this time someone would reply me.

I am using qt creator and designer to work out my application. I have 2 forms (f1,f2) I want to load f2 when f1 button is pressed and also pass a variable to f2. How can I do it?

below is my codes. when I clicked on the button. nothing happen.

Form1.h
Qt Code: 
  1. #ifndef FORM1_H
  2. #define FORM1_H
  3.  
  4. #include <QWidget>
  5.  
  6. namespace Ui {
  7.     class form1;
  8. }
  9.  
  10. class form1 : public QWidget {
  11.     Q_OBJECT
  12. public:
  13.     form1(QWidget *parent = 0);
  14.     ~form1();
  15.  
  16. protected:
  17.     void changeEvent(QEvent *e);
  18.  
  19. private slots:
  20.     void load_form2();
  21.  
  22. private:
  23.     Ui::form1 *ui;
  24. };
  25.  
  26. #endif // FORM1_H
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form1.cpp
Qt Code: 
  1. #include "form1.h"
  2. #include "ui_form1.h"
  3. #include "form2.h"
  4. #include "ui_form2.h"
  5. #include <QString>
  6.  
  7. form1::form1(QWidget *parent) :
  8.     QWidget(parent),
  9.     ui(new Ui::form1)
  10. {
  11.     ui->setupUi(this);
  12. }
  13.  
  14. form1::~form1()
  15. {
  16.     delete ui;
  17. }
  18.  
  19. void form1::changeEvent(QEvent *e)
  20. {
  21.     QWidget::changeEvent(e);
  22.     switch (e->type()) {
  23.     case QEvent::LanguageChange:
  24.         ui->retranslateUi(this);
  25.         break;
  26.     default:
  27.         break;
  28.     }
  29. }
  30.  
  31. void form1::load_form2()
  32. {
  33.     QString str = "to be pass over to f2";
  34.     Form2 f2;
  35.     f2.show();
  36. }
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from2.h
Qt Code: 
  1. #ifndef FORM2_H
  2. #define FORM2_H
  3.  
  4. #include <QWidget>
  5.  
  6. namespace Ui {
  7.     class Form2;
  8. }
  9.  
  10. class Form2 : public QWidget {
  11.     Q_OBJECT
  12. public:
  13.     Form2(QWidget *parent = 0);
  14.     ~Form2();
  15.  
  16. protected:
  17.     void changeEvent(QEvent *e);
  18.  
  19. private slots:
  20.     void load_form1();
  21.  
  22. private:
  23.     Ui::Form2 *ui;
  24. };
  25.  
  26. #endif // FORM2_H
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form2.cpp
Qt Code: 
  1. #include "form2.h"
  2. #include "ui_form2.h"
  3. #include "form1.h"
  4. #include "ui_form1.h"
  5.  
  6. Form2::Form2(QWidget *parent) :
  7.     QWidget(parent),
  8.     ui(new Ui::Form2)
  9. {
  10.     ui->setupUi(this);
  11. }
  12.  
  13. Form2::~Form2()
  14. {
  15.     delete ui;
  16. }
  17.  
  18. void Form2::changeEvent(QEvent *e)
  19. {
  20.     QWidget::changeEvent(e);
  21.     switch (e->type()) {
  22.     case QEvent::LanguageChange:
  23.         ui->retranslateUi(this);
  24.         break;
  25.     default:
  26.         break;
  27.     }
  28. }
  29.  
  30. void Form2::load_form1()
  31. {
  32.     form1 a;
  33.     a.show();
  34. }
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Main.cpp
Qt Code: 
  1. #include <QtGui/QApplication>
  2. #include "form1.h"
  3.  
  4. int main(int argc, char *argv[])
  5. {
  6.     QApplication a(argc, argv);
  7.     form1 w;
  8.     w.show();
  9.     return a.exec();
  10. }
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When I tried to new form1 like the below code

Form2 *f2 = new Form2(this) <- under button click on form 1
f2.show();

I got error
error: request for member ‘show’ in ‘a’, which is of non-class type ‘form1*’

if I remove the pointer I got this error
error: ‘QWidget::QWidget(const QWidget&)’ is private
within this context (points to class form1)

Can someone help me out? I also need to know how to pass the str string over to f2.

Thanks in advance.