我写了个程序，程序代码如下：
ui_sort.h文件

/********************************************************************************
** Form generated from reading UI file 'Sort.ui'
**
** Created: Tue Oct 18 21:51:12 2011
**      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_SORT_H
#define UI_SORT_H

#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QComboBox>
#include <QtGui/QDialog>
#include <QtGui/QGridLayout>
#include <QtGui/QGroupBox>
#include <QtGui/QHeaderView>
#include <QtGui/QLabel>
#include <QtGui/QPushButton>
#include <QtGui/QSpacerItem>
#include <QtGui/QVBoxLayout>

QT_BEGIN_NAMESPACE

class Ui_SortDialog
{
public:
    QGridLayout *gridLayout_4;
    QGroupBox *primaryGroupBox;
    QGridLayout *gridLayout;
    QLabel *label;
    QComboBox *primaryColumnCombo;
    QSpacerItem *horizontalSpacer;
    QLabel *label_2;
    QComboBox *primaryOderCombo;
    QVBoxLayout *verticalLayout;
    QPushButton *okButton;
    QPushButton *cancleButton;
    QSpacerItem *verticalSpacer;
    QPushButton *moreButton;
    QSpacerItem *verticalSpacer_2;
    QGroupBox *secondaryGroupBox;
    QGridLayout *gridLayout_2;
    QLabel *label_3;
    QComboBox *secondaryColumnCombo;
    QSpacerItem *horizontalSpacer_2;
    QLabel *label_4;
    QComboBox *secondaryOrderCombo;
    QGroupBox *tertiaryGroupBox;
    QGridLayout *gridLayout_3;
    QLabel *label_5;
    QComboBox *tertiaryColumnCombo;
    QSpacerItem *horizontalSpacer_3;
    QLabel *label_6;
    QComboBox *tertiaryOrderCombo;

    void setupUi(QDialog *SortDialog)
    {
        if (SortDialog->objectName().isEmpty())
            SortDialog->setObjectName(QString::fromUtf8("SortDialog"));
        SortDialog->resize(278, 318);
        gridLayout_4 = new QGridLayout(SortDialog);
        gridLayout_4->setObjectName(QString::fromUtf8("gridLayout_4"));
        primaryGroupBox = new QGroupBox(SortDialog);
        primaryGroupBox->setObjectName(QString::fromUtf8("primaryGroupBox"));
        gridLayout = new QGridLayout(primaryGroupBox);
        gridLayout->setObjectName(QString::fromUtf8("gridLayout"));
        label = new QLabel(primaryGroupBox);
        label->setObjectName(QString::fromUtf8("label"));

        gridLayout->addWidget(label, 0, 0, 1, 1);

        primaryColumnCombo = new QComboBox(primaryGroupBox);
        primaryColumnCombo->setObjectName(QString::fromUtf8("primaryColumnCombo"));

        gridLayout->addWidget(primaryColumnCombo, 0, 1, 1, 1);

        horizontalSpacer = new QSpacerItem(50, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);

        gridLayout->addItem(horizontalSpacer, 0, 2, 1, 1);

        label_2 = new QLabel(primaryGroupBox);
        label_2->setObjectName(QString::fromUtf8("label_2"));

        gridLayout->addWidget(label_2, 1, 0, 1, 1);

        primaryOderCombo = new QComboBox(primaryGroupBox);
        primaryOderCombo->setObjectName(QString::fromUtf8("primaryOderCombo"));

        gridLayout->addWidget(primaryOderCombo, 1, 1, 1, 2);


        gridLayout_4->addWidget(primaryGroupBox, 0, 0, 1, 1);

        verticalLayout = new QVBoxLayout();
        verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
        okButton = new QPushButton(SortDialog);
        okButton->setObjectName(QString::fromUtf8("okButton"));
        okButton->setDefault(true);

        verticalLayout->addWidget(okButton);

        cancleButton = new QPushButton(SortDialog);
        cancleButton->setObjectName(QString::fromUtf8("cancleButton"));

        verticalLayout->addWidget(cancleButton);

        verticalSpacer = new QSpacerItem(20, 0, QSizePolicy::Minimum, QSizePolicy::Expanding);

        verticalLayout->addItem(verticalSpacer);

        moreButton = new QPushButton(SortDialog);
        moreButton->setObjectName(QString::fromUtf8("moreButton"));
        moreButton->setCheckable(true);

        verticalLayout->addWidget(moreButton);


        gridLayout_4->addLayout(verticalLayout, 0, 1, 2, 1);

        verticalSpacer_2 = new QSpacerItem(20, 42, QSizePolicy::Minimum, QSizePolicy::Expanding);

        gridLayout_4->addItem(verticalSpacer_2, 1, 0, 1, 1);

        secondaryGroupBox = new QGroupBox(SortDialog);
        secondaryGroupBox->setObjectName(QString::fromUtf8("secondaryGroupBox"));
        gridLayout_2 = new QGridLayout(secondaryGroupBox);
        gridLayout_2->setObjectName(QString::fromUtf8("gridLayout_2"));
        label_3 = new QLabel(secondaryGroupBox);
        label_3->setObjectName(QString::fromUtf8("label_3"));

        gridLayout_2->addWidget(label_3, 0, 0, 1, 1);

        secondaryColumnCombo = new QComboBox(secondaryGroupBox);
        secondaryColumnCombo->setObjectName(QString::fromUtf8("secondaryColumnCombo"));

        gridLayout_2->addWidget(secondaryColumnCombo, 0, 1, 1, 1);

        horizontalSpacer_2 = new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);

        gridLayout_2->addItem(horizontalSpacer_2, 0, 2, 1, 1);

        label_4 = new QLabel(secondaryGroupBox);
        label_4->setObjectName(QString::fromUtf8("label_4"));

        gridLayout_2->addWidget(label_4, 1, 0, 1, 1);

        secondaryOrderCombo = new QComboBox(secondaryGroupBox);
        secondaryOrderCombo->setObjectName(QString::fromUtf8("secondaryOrderCombo"));

        gridLayout_2->addWidget(secondaryOrderCombo, 1, 1, 1, 2);


        gridLayout_4->addWidget(secondaryGroupBox, 2, 0, 1, 1);

        tertiaryGroupBox = new QGroupBox(SortDialog);
        tertiaryGroupBox->setObjectName(QString::fromUtf8("tertiaryGroupBox"));
        gridLayout_3 = new QGridLayout(tertiaryGroupBox);
        gridLayout_3->setObjectName(QString::fromUtf8("gridLayout_3"));
        label_5 = new QLabel(tertiaryGroupBox);
        label_5->setObjectName(QString::fromUtf8("label_5"));

        gridLayout_3->addWidget(label_5, 0, 0, 1, 1);

        tertiaryColumnCombo = new QComboBox(tertiaryGroupBox);
        tertiaryColumnCombo->setObjectName(QString::fromUtf8("tertiaryColumnCombo"));

        gridLayout_3->addWidget(tertiaryColumnCombo, 0, 1, 1, 1);

        horizontalSpacer_3 = new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);

        gridLayout_3->addItem(horizontalSpacer_3, 0, 2, 1, 1);

        label_6 = new QLabel(tertiaryGroupBox);
        label_6->setObjectName(QString::fromUtf8("label_6"));

        gridLayout_3->addWidget(label_6, 1, 0, 1, 1);

        tertiaryOrderCombo = new QComboBox(tertiaryGroupBox);
        tertiaryOrderCombo->setObjectName(QString::fromUtf8("tertiaryOrderCombo"));

        gridLayout_3->addWidget(tertiaryOrderCombo, 1, 1, 1, 2);


        gridLayout_4->addWidget(tertiaryGroupBox, 3, 0, 1, 1);

        QWidget::setTabOrder(primaryColumnCombo, primaryOderCombo);
        QWidget::setTabOrder(primaryOderCombo, secondaryColumnCombo);
        QWidget::setTabOrder(secondaryColumnCombo, secondaryOrderCombo);
        QWidget::setTabOrder(secondaryOrderCombo, tertiaryColumnCombo);
        QWidget::setTabOrder(tertiaryColumnCombo, tertiaryOrderCombo);
        QWidget::setTabOrder(tertiaryOrderCombo, okButton);
        QWidget::setTabOrder(okButton, cancleButton);
        QWidget::setTabOrder(cancleButton, moreButton);

        retranslateUi(SortDialog);
        QObject::connect(okButton, SIGNAL(clicked()), SortDialog, SLOT(accept()));
        QObject::connect(cancleButton, SIGNAL(clicked()), SortDialog, SLOT(reject()));
        QObject::connect(moreButton, SIGNAL(toggled(bool)), secondaryGroupBox, SLOT(setVisible(bool)));
        QObject::connect(moreButton, SIGNAL(toggled(bool)), tertiaryGroupBox, SLOT(setVisible(bool)));

        QMetaObject::connectSlotsByName(SortDialog);
    } // setupUi

    void retranslateUi(QDialog *SortDialog)
    {
        SortDialog->setWindowTitle(QApplication::translate("SortDialog", "Sort", 0, QApplication::UnicodeUTF8));
        primaryGroupBox->setTitle(QApplication::translate("SortDialog", "&Primary Key", 0, QApplication::UnicodeUTF8));
        label->setText(QApplication::translate("SortDialog", "Column:", 0, QApplication::UnicodeUTF8));
        primaryColumnCombo->clear();
        primaryColumnCombo->insertItems(0, QStringList()
         << QApplication::translate("SortDialog", "None", 0, QApplication::UnicodeUTF8)
        );
        label_2->setText(QApplication::translate("SortDialog", "Order:", 0, QApplication::UnicodeUTF8));
        primaryOderCombo->clear();
        primaryOderCombo->insertItems(0, QStringList()
         << QApplication::translate("SortDialog", "Ascending", 0, QApplication::UnicodeUTF8)
         << QApplication::translate("SortDialog", "Descending", 0, QApplication::UnicodeUTF8)
        );
        okButton->setText(QApplication::translate("SortDialog", "OK", 0, QApplication::UnicodeUTF8));
        cancleButton->setText(QApplication::translate("SortDialog", "Cancle", 0, QApplication::UnicodeUTF8));
        moreButton->setText(QApplication::translate("SortDialog", "&More", 0, QApplication::UnicodeUTF8));
        secondaryGroupBox->setTitle(QApplication::translate("SortDialog", "&Secondary Key", 0, QApplication::UnicodeUTF8));
        label_3->setText(QApplication::translate("SortDialog", "Column:", 0, QApplication::UnicodeUTF8));
        secondaryColumnCombo->clear();
        secondaryColumnCombo->insertItems(0, QStringList()
         << QApplication::translate("SortDialog", "None", 0, QApplication::UnicodeUTF8)
        );
        label_4->setText(QApplication::translate("SortDialog", "Order:", 0, QApplication::UnicodeUTF8));
        secondaryOrderCombo->clear();
        secondaryOrderCombo->insertItems(0, QStringList()
         << QApplication::translate("SortDialog", "Ascending", 0, QApplication::UnicodeUTF8)
         << QApplication::translate("SortDialog", "Descending", 0, QApplication::UnicodeUTF8)
        );
        tertiaryGroupBox->setTitle(QApplication::translate("SortDialog", "&Tertiary Key", 0, QApplication::UnicodeUTF8));
        label_5->setText(QApplication::translate("SortDialog", "Column:", 0, QApplication::UnicodeUTF8));
        tertiaryColumnCombo->clear();
        tertiaryColumnCombo->insertItems(0, QStringList()
         << QApplication::translate("SortDialog", "None", 0, QApplication::UnicodeUTF8)
        );
        label_6->setText(QApplication::translate("SortDialog", "Order:", 0, QApplication::UnicodeUTF8));
        tertiaryOrderCombo->clear();
        tertiaryOrderCombo->insertItems(0, QStringList()
         << QApplication::translate("SortDialog", "Ascending", 0, QApplication::UnicodeUTF8)
         << QApplication::translate("SortDialog", "Descending", 0, QApplication::UnicodeUTF8)
        );
    } // retranslateUi

};

namespace Ui {
    class SortDialog: public Ui_SortDialog {};
} // namespace Ui

QT_END_NAMESPACE

#endif // UI_SORT_H

sort.h文件：

#ifndef SORT_H
#define SORT_H

#include <QDialog>
#include "ui_sort.h"

class SortDialog : public Ui::SortDialog, public QDialog
{
    Q_OBJECT

public:
    SortDialog(QWidget *parent = 0);
    void setColumnRange(QChar first, QChar last);
};

#endif // SORT_H

sort.cpp文件：

#include "sort.h"

SortDialog::SortDialog(QWidget *parent)
    :QDialog(parent)
{
    setupUi(this);

    this->secondaryGroupBox->hide();
    this->tertiaryGroupBox->hide();
    layout()->setSizeConstraint(QLayout::SetFixedSize);

    this->setColumnRange('A','Z');
}

void SortDialog::setColumnRange(QChar first, QChar last)
{
    this->primaryColumnCombo->clear();
    this->secondaryColumnCombo->clear();
    this->tertiaryColumnCombo->clear();

    this->secondaryColumnCombo->addItem(tr("None"));
    this->tertiaryColumnCombo->addItem(tr("None"));
    this->primaryColumnCombo->setMinimumSize(this->secondaryColumnCombo->sizeHint());

    QChar ch = first;

    while(ch != last)
    {
        this->primaryColumnCombo->addItem(QString(ch));
        this->secondaryColumnCombo->addItem(QString(ch));
        this->tertiaryColumnCombo->addItem(QString(ch));
        ch = ch.unicode() + 1;
    }
}

main.cpp文件：

#include <QtGui/QApplication>
#include "sort.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    SortDialog *dialog = new SortDialog();
    dialog->setColumnRange('C','F');
    dialog->show();

    return a.exec();
}

但是最后编译出现了一下错误：
为项目ExtendDialog执行构建步骤 ...
配置没有改变, 跳过 qmake 步骤.
正在启动 "C:\QtSDK\mingw\bin\mingw32-make.exe"
 {1"?} {2?}
C:/QtSDK/mingw/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `F:/Qt Workspace/ExtendDialog'
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\QtCore" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\QtGui" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\ActiveQt" -I"debug" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\mkspecs\win32-g++" -o debug\main.o main.cpp
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\QtCore" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\QtGui" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\ActiveQt" -I"debug" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\mkspecs\win32-g++" -o debug\sort.o sort.cpp
C:\QtSDK\Desktop\Qt\4.7.4\mingw\bin\moc.exe -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\QtCore" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\QtGui" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\ActiveQt" -I"debug" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\mkspecs\win32-g++" -D__GNUC__ -DWIN32 sort.h -o debug\moc_sort.cpp
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\QtCore" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\QtGui" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\include\ActiveQt" -I"debug" -I"c:\QtSDK\Desktop\Qt\4.7.4\mingw\mkspecs\win32-g++" -o debug\moc_sort.o debug\moc_sort.cpp
debug\moc_sort.cpp:41: error: 'staticMetaObject' is not a member of 'Ui::SortDialog'
debug\moc_sort.cpp: In member function 'virtual void* SortDialog::qt_metacast(const char*)':
debug\moc_sort.cpp:62: error: 'qt_metacast' is not a member of 'SortDialog::qt_metacast(const char*)::QMocSuperClass'
debug\moc_sort.cpp: In member function 'virtual int SortDialog::qt_metacall(QMetaObject::Call, int, void**)':
debug\moc_sort.cpp:68: error: 'qt_metacall' is not a member of 'SortDialog::qt_metacall(QMetaObject::Call, int, void**)::QMocSuperClass'
mingw32-make[1]: Leaving directory `F:/Qt Workspace/ExtendDialog'
mingw32-make[1]: *** [debug/moc_sort.o] Error 1
mingw32-make: *** [debug] Error 2
进程"C:\QtSDK\mingw\bin\mingw32-make.exe"退出，退出代码 2 。
构建项目ExtendDialog 时发生错误 (目标: 桌面)
当执行构建步骤 'Make'时


该如何解决呢。

看来qt板块很不活跃呀，都没人搭理的。。。哎。。。

怎么回事儿？？？

你的代码又长有没注解，谁看啊！
写上注解好一点！

建议以后在进行界面多重继承时将QT库类放在前面class xdialog : public QDialog, public ui::dialog,不要写成这样public Ui::SortDialog, public QDialog。这就是你问题的原因。