I need to change the value of a lineEdit text from other form.
I now that is a stupid question, I have searched through the forum but didn't found how to.
I have made a very simple project for illustrate: main class, form1 and form2 that contains a lineEdit and a pushButton each.
-The main function instantiate and show form1.
-In form1, the pushButton instantiate and show form2
-In form2, the pushButton should take the form2.lineEdit text (m_ui->lineEdit->text() ) and save it into form1.lineEdit

I don't know how to acces form1.lineEdit from form2.
If I try form1->lineEdit->text() it throw "form1 is not declarated at this scope"

I include the code.

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 form1;  //Instanciate and show form1
  8.     form1.show();
  9.     return a.exec();
  10. }
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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.  
  6. Form1::Form1(QWidget *parent)
  7.     : QMainWindow(parent), ui(new Ui::Form1)
  8. {
  9.     ui->setupUi(this);
  10. }
  11.  
  12. Form1::~Form1()
  13. {
  14.     delete ui;
  15. }
  16.  
  17. void Form1::on_pushButton_clicked() //Instanciate and show form2
  18. {
  19.   static Form2* form2 = new Form2(this);
  20.   form2->show();
  21.  
  22. }
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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.     QMainWindow(parent),
  8.     m_ui(new Ui::Form2)
  9. {
  10.     m_ui->setupUi(this);
  11. }
  12.  
  13. Form2::~Form2()
  14. {
  15.     delete m_ui;
  16. }
  17.  
  18. void Form2::changeEvent(QEvent *e)
  19. {
  20.     QMainWindow::changeEvent(e);
  21.     switch (e->type()) {
  22.     case QEvent::LanguageChange:
  23.         m_ui->retranslateUi(this);
  24.         break;
  25.     default:
  26.         break;
  27.     }
  28. }
  29.  
  30. void Form2::on_pushButton_clicked()
  31. {
  32.     QString text=m_ui->lineEdit->text();
  33.     //
  34.     // Here I want to change the value of lineEdit widget in form1
  35.     //
  36.     // I think that "form1->ui->lineEdit->setText("xyz");" should work, but when building it throws:
  37.     // "/home/ioseba/QT/Programas QT/2ventanas/form2.cpp:35: error: ‘form1’ was not declared in this scope
  38. }
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Thanks for your time.