Hello,
I use the following software: Qt 4.8.1, VC++ 2010, MS Windows, Qt Creator




I prepared the following QWizardPage class:
Qt Code: 
  1. class AppWizard : public QWizard
  2. {
  3.     Q_OBJECT
  4. public:
  5.     explicit AppWizard(QWidget *parent = 0);
  6. };
  7.  
  8.  
  9. class WelcomePage : public QWizardPage
  10. {
  11.     Q_OBJECT
  12. public:
  13.     explicit WelcomePage(QWidget *parent = 0);
  14. private:
  15.     QLabel *intro_label_1;
  16.     QLabel *intro_label_2;
  17.     QVBoxLayout *vbox_layout;
  18.     QGridLayout *grid_layout;
  19.     QLabel *email_label;
  20.     QLineEdit *email_edit;
  21.     QRegExpValidator *email_validator;
  22.     QLabel *password_label;
  23.     QLineEdit *password_edit;
  24.     QPushButton *login;
  25.     QLabel *register_label;
  26. };
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Qt Code: 
  1. WelcomePage::WelcomePage(QWidget *parent) :
  2.     QWizardPage(parent)
  3. {
  4. //    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));
  5.     setTitle("There is title");
  6.     setButtonText(QWizard::NextButton, "Another name");
  7.     setButtonText(QWizard::CancelButton, "Another cancel");
  8.  
  9.     intro_label_1 = new QLabel("Welcome to software");
  10.     intro_label_2 = new QLabel("ółćłćłźźłżżźćźżłźżć.");
  11.     email_label = new QLabel("ółłłąął");
  12.     email_edit = new QLineEdit(this);
  13.  
  14.     password_label = new QLabel("ddsdfdsffds");
  15.     password_edit = new QLineEdit(this);
  16.     password_edit->setEchoMode(QLineEdit::Password);
  17.     login = new QPushButton();
  18.     login->setText("dsfsfsfsfdsf");
  19.     login->setMaximumWidth(100);
  20.     register_label = new QLabel("dsfdfsdsfdsff");
  21.  
  22.     grid_layout = new QGridLayout(this);
  23.     grid_layout->addWidget(intro_label_1, 0, 0);
  24.     grid_layout->addWidget(intro_label_2, 1,0);
  25.     grid_layout->addWidget(email_label, 2, 0);
  26.     grid_layout->addWidget(email_edit, 2, 1);
  27.     grid_layout->addWidget(password_label, 3, 0);
  28.     grid_layout->addWidget(password_edit, 3, 1);
  29.     grid_layout->addWidget(login, 4, 0);
  30.     grid_layout->addWidget(register_label, 7, 0);
  31. }
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However,the encodings fails. I tried to fix this using:
Qt Code: 
  1. // QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));
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Does Qt Creator use UTF-8 as default encoding? Why unicode chars are not displayed correctly in additional class?

Thank you for you attention,