Qt5中的QtGui

我在学习Qt查看Qt Creater提供的例子时，遇到了一个小问题。就是明明在代码中包含了QtGui，然而编译的时候还是提示找不到QLabel的定义，以及其他一些类的定义，但是这是官方提供的文档的啊，不应该没通过编译就提供吧，所以就想肯定是自己哪里出了问题，在网上搜了一下果然，归根到底还是版本问题吧，提供的文档估计是版本qt4的，而我自己使用的是qt5，它两个之间的一个区别就是Qt5把关于控件的头文件都移到 <QtWidgets>中了，所以如果在 Qt5 中使用控件应该包含 <QtWidgets>而非<QtGui>。

  1 /****************************************************************************
  2  **
  3  ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
  4  ** Contact: http://www.qt-project.org/legal
  5  **
  6  ** This file is part of the examples of the Qt Toolkit.
  7  **
  8  ** $QT_BEGIN_LICENSE:BSD$
  9  ** You may use this file under the terms of the BSD license as follows:
 10  **
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 40
 41 #include <QtWidgets>
 42 #include <QTranslator>
 43 #include <QLocale>
 44 #include <QLibraryInfo>
 45
 46
 47  QWizardPage *createIntroPage()
 48  {
 49      QWizardPage *page = new QWizardPage;
 50      page->setTitle("Introduction");
 51
 52      QLabel *label = new QLabel("This wizard will help you register your copy "
 53                                 "of Super Product Two.");
 54      label->setWordWrap(true);
 55
 56      QVBoxLayout *layout = new QVBoxLayout;
 57      layout->addWidget(label);
 58      page->setLayout(layout);
 59
 60      return page;
 61  }
 62
 63  QWizardPage *createRegistrationPage()
 64  {
 65      QWizardPage *page = new QWizardPage;
 66      page->setTitle("Registration");
 67      page->setSubTitle("Please fill both fields.");
 68
 69      QLabel *nameLabel = new QLabel("Name:");
 70      QLineEdit *nameLineEdit = new QLineEdit;
 71
 72      QLabel *emailLabel = new QLabel("Email address:");
 73      QLineEdit *emailLineEdit = new QLineEdit;
 74
 75      QGridLayout *layout = new QGridLayout;
 76      layout->addWidget(nameLabel, 0, 0);
 77      layout->addWidget(nameLineEdit, 0, 1);
 78      layout->addWidget(emailLabel, 1, 0);
 79      layout->addWidget(emailLineEdit, 1, 1);
 80      page->setLayout(layout);
 81
 82      return page;
 83  }
 84
 85  QWizardPage *createConclusionPage()
 86  {
 87      QWizardPage *page = new QWizardPage;
 88      page->setTitle("Conclusion");
 89
 90      QLabel *label = new QLabel("You are now successfully registered. Have a "
 91                                 "nice day!");
 92      label->setWordWrap(true);
 93
 94      QVBoxLayout *layout = new QVBoxLayout;
 95      layout->addWidget(label);
 96      page->setLayout(layout);
 97
 98      return page;
 99  }
100
101  int main(int argc, char *argv[])
102  {
103      QApplication app(argc, argv);
104
105      QString translatorFileName = QLatin1String("qt_");
106      translatorFileName += QLocale::system().name();
107      QTranslator *translator = new QTranslator(&app);
108      if (translator->load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
109          app.installTranslator(translator);
110
111      QWizard wizard;
112      wizard.addPage(createIntroPage());
113      wizard.addPage(createRegistrationPage());
114      wizard.addPage(createConclusionPage());
115
116      wizard.setWindowTitle("Trivial Wizard");
117  #ifdef Q_OS_SYMBIAN
118      wizard.showMaximized();
119  #else
120      wizard.show();
121  #endif
122
123      return app.exec();
124  }

然后程序就顺利运行了。

Qt5中的QtGui