关于this指针的使用异常有关问题~大神帮忙啊

关于this指针的使用错误问题~大神帮忙啊~~
先把代码贴上吧

C/C++ code


QWizardPage *createPage2()
{
    QWizardPage *page2 = new QWizardPage;
    page2->setTitle("page2");
    QLabel *label2 = new QLabel("page2"
                           ".");
    label2->setWordWrap(true);


///////////////////////////////////////////////////////////////
    QLabel *label21;
    QLineEdit *lineEdit21;
    label21 = new QLabel("UE Style(central;middle;edge):");
    lineEdit21 = new QLineEdit;
    label21->setBuddy(lineEdit21);
    QHBoxLayout *layout21 = new QHBoxLayout;
    layout21->addWidget(label21);
    layout21->addWidget(lineEdit21);


    QLabel *label22;
    QLineEdit *lineEdit22;
    label22 = new QLabel("Number of BS:");
    lineEdit22 = new QLineEdit;
    label22->setBuddy(lineEdit22);
    QHBoxLayout *layout22 = new QHBoxLayout;
    layout22->addWidget(label22);
    layout22->addWidget(lineEdit22);


    QLabel *label23;
    QLineEdit *lineEdit23;
    label23 = new QLabel("Number of UE:");
    lineEdit23 = new QLineEdit;
    label23->setBuddy(lineEdit23);
    QHBoxLayout *layout23 = new QHBoxLayout;
    layout23->addWidget(label23);
    layout23->addWidget(lineEdit23);


    QLabel *label24;
    QLineEdit *lineEdit24;
    label24 = new QLabel("...:");
    lineEdit24 = new QLineEdit;
    label24->setBuddy(lineEdit24);
    QHBoxLayout *layout24 = new QHBoxLayout;
    layout24->addWidget(label24);
    layout24->addWidget(lineEdit24);


    QLabel *label25;
    QLineEdit *lineEdit25;
    label25 = new QLabel("...:");
    lineEdit25 = new QLineEdit;
    label25->setBuddy(lineEdit25);
    QHBoxLayout *layout25 = new QHBoxLayout;
    layout25->addWidget(label25);
    layout25->addWidget(lineEdit25);

/////////////////////////////////////////////////////////////////

    QPushButton *OKButton = new QPushButton("OK");

    QVBoxLayout *leftlayout = new QVBoxLayout;
    leftlayout->addLayout(layout21);
    leftlayout->addLayout(layout22);
    leftlayout->addLayout(layout23);
    leftlayout->addLayout(layout24);
    leftlayout->addLayout(layout25);

    QHBoxLayout *downlayout = new QHBoxLayout;
    downlayout->addLayout(leftlayout);
    downlayout->addWidget(OKButton);

    QVBoxLayout *layout2 = new QVBoxLayout;
    layout2->addWidget(label2);
    layout2->addLayout(downlayout);
    page2->setLayout(layout2);


    QObject::connect(OKButton, SIGNAL(clicked()), this, SLOT(save()));   //////////错误在这~~

    return page2;
}

void save()
{
    QFile file("F:/QtWorkshop/test_next/123.txt");
    file.open(QIODevice::ReadWrite|QIODevice::Text);
    QTextStream in1(&file);
    in1 << lineEdit21->text() << endl;                                  //////错误
    QTextStream in2(&file);
    in2 << lineEdit22->text() << endl;                                    //////错误
    QTextStream in3(&file);
    in3 << lineEdit23->text() << endl;                                   //////错误
    QTextStream in4(&file);
    in4 << lineEdit24->text() << endl;                                  //////错误
    QTextStream in5(&file);
    in5 << lineEdit25->text() << endl;                                  //////错误
}

错误提示是：
1、invalid of use of 'this' in non-member function
2、'lineEdit21' was not declared in this scope

这是怎么回事啊，我知道this指针肯定用的不对，但那个信号槽里面应该如何写啊？？
还有为什么会提示lineEdit21没有声明啊~？

我想完成的功能是：在页面2上添加几个lineEdit，然后点击OK按钮会把lineEdit中的内容保存到txt文档里，不知道我的save()函数写在那有没有问题啊？？

我把主函数也贴在下面吧，方便跑通

C/C++ code



#include <QtGui/QApplication>
#include "dialog.h"
#include <qwizard.h>
#include <QLabel>
#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QString translatorFileName = QLatin1String("qt_");
    translatorFileName += QLocale::system().name();
    QTranslator *translator = new QTranslator(&app);
    if (translator->load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
        app.installTranslator(translator);

    QWizard wizard;
//    wizard.addPage(createIntroPage());
//    wizard.addPage(createPage1());
    wizard.addPage(createPage2());
//    wizard.addPage(createPage3());
//    wizard.addPage(createPage4());

    wizard.setWindowTitle("Trivial Wizard");
    wizard.show();

    return app.exec();
}

关于this指针的使用异常有关问题~大神帮忙啊

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