QT中如何使用ui文件

/********************************************************************************

** Form generated from reading UI file 'mainwindow.ui'

**

** Created: Mon Dec 2 14:42:57 2013

**      by: Qt User Interface Compiler version 4.7.4

**

** WARNING! All changes made in this file will be lost when recompiling UI file!

********************************************************************************/

#ifndef UI_MAINWINDOW_H

#define UI_MAINWINDOW_H

#include <QtCore/QVariant>

#include <QtGui/QAction>

#include <QtGui/QApplication>

#include <QtGui/QButtonGroup>

#include <QtGui/QHeaderView>

#include <QtGui/QMainWindow>

#include <QtGui/QMenu>

#include <QtGui/QMenuBar>

#include <QtGui/QStatusBar>

#include <QtGui/QTextEdit>

#include <QtGui/QToolBar>

#include <QtGui/QWidget>

QT_BEGIN_NAMESPACE

class Ui_MainWindow

{

public:

    QAction *actionNew;

    QAction *actionOpen;

    QAction *actionClose;

    QAction *actionSave;

    QAction *actionSaveAs;

    QAction *actionQuit;

    QAction *actionUndo;

    QAction *actionCut;

    QAction *actionCopy;

    QAction *actionPaste;

    QAction *actionSelectAll;

    QAction *actionSearchFile;

    QWidget *centralwidget;

    QTextEdit *textEdit;

    QStatusBar *statusbar;

    QMenuBar *menuBar;

    QMenu *menuFile;

    QMenu *menuEdit;

    QMenu *menuTool;

    QToolBar *FileToolBar;

    QToolBar *EditToolBar;

    void setupUi(QMainWindow *MainWindow)

    {

        if (MainWindow->objectName().isEmpty())

            MainWindow->setObjectName(QString::fromUtf8("MainWindow"));

        MainWindow->resize(800, 600);

        actionNew = new QAction(MainWindow);

        actionNew->setObjectName(QString::fromUtf8("actionNew"));

        actionOpen = new QAction(MainWindow);

        actionOpen->setObjectName(QString::fromUtf8("actionOpen"));

        actionClose = new QAction(MainWindow);

        actionClose->setObjectName(QString::fromUtf8("actionClose"));

        actionSave = new QAction(MainWindow);

        actionSave->setObjectName(QString::fromUtf8("actionSave"));

        actionSaveAs = new QAction(MainWindow);

        actionSaveAs->setObjectName(QString::fromUtf8("actionSaveAs"));

        actionQuit = new QAction(MainWindow);

        actionQuit->setObjectName(QString::fromUtf8("actionQuit"));

        actionUndo = new QAction(MainWindow);

        actionUndo->setObjectName(QString::fromUtf8("actionUndo"));

        actionCut = new QAction(MainWindow);

        actionCut->setObjectName(QString::fromUtf8("actionCut"));

        actionCopy = new QAction(MainWindow);

        actionCopy->setObjectName(QString::fromUtf8("actionCopy"));

        actionPaste = new QAction(MainWindow);

        actionPaste->setObjectName(QString::fromUtf8("actionPaste"));

        actionSelectAll = new QAction(MainWindow);

        actionSelectAll->setObjectName(QString::fromUtf8("actionSelectAll"));

        actionSearchFile = new QAction(MainWindow);

        actionSearchFile->setObjectName(QString::fromUtf8("actionSearchFile"));

        centralwidget = new QWidget(MainWindow);

        centralwidget->setObjectName(QString::fromUtf8("centralwidget"));

        textEdit = new QTextEdit(centralwidget);

        textEdit->setObjectName(QString::fromUtf8("textEdit"));

        textEdit->setGeometry(QRect(0, 10, 711, 491));

        MainWindow->setCentralWidget(centralwidget);

        statusbar = new QStatusBar(MainWindow);

        statusbar->setObjectName(QString::fromUtf8("statusbar"));

        MainWindow->setStatusBar(statusbar);

        menuBar = new QMenuBar(MainWindow);

        menuBar->setObjectName(QString::fromUtf8("menuBar"));

        menuBar->setGeometry(QRect(0, 0, 800, 28));

        menuFile = new QMenu(menuBar);

        menuFile->setObjectName(QString::fromUtf8("menuFile"));

        menuEdit = new QMenu(menuBar);

        menuEdit->setObjectName(QString::fromUtf8("menuEdit"));

        menuTool = new QMenu(menuBar);

        menuTool->setObjectName(QString::fromUtf8("menuTool"));

        MainWindow->setMenuBar(menuBar);

        FileToolBar = new QToolBar(MainWindow);

        FileToolBar->setObjectName(QString::fromUtf8("FileToolBar"));

        MainWindow->addToolBar(Qt::TopToolBarArea, FileToolBar);

        EditToolBar = new QToolBar(MainWindow);

        EditToolBar->setObjectName(QString::fromUtf8("EditToolBar"));

        MainWindow->addToolBar(Qt::TopToolBarArea, EditToolBar);

        menuBar->addAction(menuFile->menuAction());

        menuBar->addAction(menuEdit->menuAction());

        menuBar->addAction(menuTool->menuAction());

        menuFile->addAction(actionNew);

        menuFile->addAction(actionOpen);

        menuFile->addAction(actionClose);

        menuFile->addAction(actionSave);

        menuFile->addAction(actionSaveAs);

        menuFile->addAction(actionQuit);

        menuEdit->addAction(actionUndo);

        menuEdit->addAction(actionCut);

        menuEdit->addAction(actionCopy);

        menuEdit->addAction(actionPaste);

        menuEdit->addAction(actionSelectAll);

        menuTool->addAction(actionSearchFile);

        retranslateUi(MainWindow);

        QMetaObject::connectSlotsByName(MainWindow);

    } // setupUi

    void retranslateUi(QMainWindow *MainWindow)

    {

        MainWindow->setWindowTitle(QApplication::translate("MainWindow", "MainWindow", 0, QApplication::UnicodeUTF8));

        actionNew->setText(QApplication::translate("MainWindow", "\346\226\260\345\273\272", 0, QApplication::UnicodeUTF8));

        actionOpen->setText(QApplication::translate("MainWindow", "\346\211\223\345\274\200", 0, QApplication::UnicodeUTF8));

        actionClose->setText(QApplication::translate("MainWindow", "\345\205\263\351\227\255", 0, QApplication::UnicodeUTF8));

        actionSave->setText(QApplication::translate("MainWindow", "\344\277\235\345\255\230", 0, QApplication::UnicodeUTF8));

        actionSaveAs->setText(QApplication::translate("MainWindow", "\345\217\246\345\255\230\344\270\272", 0, QApplication::UnicodeUTF8));

        actionQuit->setText(QApplication::translate("MainWindow", "\351\200\200\345\207\272", 0, QApplication::UnicodeUTF8));

        actionUndo->setText(QApplication::translate("MainWindow", "\346\222\244\351\224\200", 0, QApplication::UnicodeUTF8));

        actionCut->setText(QApplication::translate("MainWindow", "\345\211\252\345\210\207", 0, QApplication::UnicodeUTF8));

        actionCopy->setText(QApplication::translate("MainWindow", "\345\244\215\345\210\266", 0, QApplication::UnicodeUTF8));

        actionPaste->setText(QApplication::translate("MainWindow", "\347\262\230\345\270\226", 0, QApplication::UnicodeUTF8));

        actionSelectAll->setText(QApplication::translate("MainWindow", "\345\205\250\351\200\211", 0, QApplication::UnicodeUTF8));

        actionSearchFile->setText(QApplication::translate("MainWindow", "\346\237\245\346\211\276\346\226\207\344\273\266", 0, QApplication::UnicodeUTF8));

        menuFile->setTitle(QApplication::translate("MainWindow", "\346\226\207\344\273\266", 0, QApplication::UnicodeUTF8));

        menu
4000
Edit->setTitle(QApplication::translate("MainWindow", "\347\274\226\350\276\221", 0, QApplication::UnicodeUTF8));

        menuTool->setTitle(QApplication::translate("MainWindow", "\345\267\245\345\205\267", 0, QApplication::UnicodeUTF8));

        FileToolBar->setWindowTitle(QApplication::translate("MainWindow", "\346\226\260\345\273\272", 0, QApplication::UnicodeUTF8));

        EditToolBar->setWindowTitle(QApplication::translate("MainWindow", "toolBar", 0, QApplication::UnicodeUTF8));

    } // retranslateUi

};

namespace Ui {

    class MainWindow: public Ui_MainWindow {};

} // namespace Ui

QT_END_NAMESPACE

#endif // UI_MAINWINDOW_H

以上是由ui文件直接生成的.h文件，其中红色的部分就是我们生成的可以用的类，类名为MainWindow，命名空间为Ui,

接着我们新建一个类然后从此UI类中继承

#include <QApplication>

#include <QMainWindow>

#include <QWidget>

#include "ui_mainwindow.h"

//class Win : public QMainWindow,public Ui::MainWindow

class Win : public Ui::MainWindow,public QMainWindow

{
public:
Win(QMainWindow* parent = 0):QMainWindow(parent)/
{
setupUi(this);
}

};

//注意这边的父类要与  刚才生成的.h文件中  void setupUi(QMainWindow *MainWindow)对应

注意有的父类可能是QDialog，QWidget，可能不同，我有一次就是想当然认为是QWidget，结果出错

int main(int argc,char** argv)

{
QApplication app(argc,argv);
Win w;

        w.show();

        return app.exec();       

}

这样qmake -project ;qmake;make就生成我们的程序了