在visual studio上编译qt示例时发生链接错误

我在用visual c++express 2010上的qt 4第二版书编译c++GUI编程中的qt示例时遇到了问题。由于qt visual studio加载项不适用于express edition，我只需添加库依赖项就可以自行配置它：qtmaind.lib QtCred4.lib QtGuid4.lib。此外，我还可以编译示例代码"你好，qt！"没有错误。我的项目包含两个.cpp文件和一个头文件：
findDialog.h:

#ifndef FINDDIALOG_H
#define FINDDIALOG_H
#include <QtGuiqdialog.h>
class QCheckBox;
class QLabel;
class QLineEdit;
class QPushButton;
class findDialog : public QDialog
{
    Q_OBJECT
public:
    findDialog(QWidget* parent = 0);
signals:
    void findNext(const QString &str , Qt::CaseSensitivity cs);
    void findPrevious(const QString &str , Qt::CaseSensitivity cs);
private slots:
    void findClicked();
    void enableFindButton(const QString& text);
private:
    QLabel* label;
    QLineEdit* lineEdit;
    QCheckBox* caseCheckBox;
    QCheckBox* backwardCheckBox;
    QPushButton* findButton;
    QPushButton* closeButton;
};
#endif

findDialog.cpp:

#include <QtGuiQtGui>
#include "findDialog.h"

findDialog::findDialog(QWidget* parent) : QDialog(parent)
{
    label = new QLabel(tr("Find &what:"));
    lineEdit = new QLineEdit;
    label->setBuddy(lineEdit);
    caseCheckBox = new QCheckBox(tr("Match &case"));
    backwardCheckBox = new QCheckBox(tr("Search &backward"));
    findButton = new QPushButton(tr("&Find"));
    findButton->setDefault(true);
    findButton->setEnabled(false);
    closeButton = new QPushButton(tr("Close"));
    connect(lineEdit , SIGNAL(textChanged(const QString&)) , this , SLOT(enableFindButton(const QString&)));
    connect(findButton , SIGNAL(clicked()) , this , SLOT(findClicked()));
    connect(closeButton , SIGNAL(clicked()) , this , SLOT(close()));
    QHBoxLayout* topLeftLayout = new QHBoxLayout;
    topLeftLayout->addWidget(label);
    topLeftLayout->addWidget(lineEdit);
    QVBoxLayout *leftLayout = new QVBoxLayout;
    leftLayout->addLayout(topLeftLayout);
    leftLayout->addWidget(caseCheckBox);
    leftLayout->addWidget(backwardCheckBox);
    QVBoxLayout *rightLayout = new QVBoxLayout;
    rightLayout->addWidget(findButton);
    rightLayout->addWidget(closeButton);
    rightLayout->addStretch();
    QHBoxLayout *mainLayout = new QHBoxLayout;
    mainLayout->addLayout(leftLayout);
    mainLayout->addLayout(rightLayout);
    setLayout(mainLayout);
    setWindowTitle(tr("Find"));
    setFixedHeight(sizeHint().height());
}
void findDialog::findClicked()
{
    QString text = lineEdit->text();
    Qt::CaseSensitivity cs = caseCheckBox->isChecked() ? Qt::CaseSensitive : Qt::CaseInsensitive;
    if(backwardCheckBox->isChecked())
        emit findPrevious(text , cs);
    else
        emit findNext(text , cs);
}
void findDialog::enableFindButton(const QString& text)
{
    findButton->setEnabled(!text.isEmpty());
}

main.cpp:

#include <QtGuiqapplication.h>
#include <iostream>
#include "findDialog.h"

int main(int argc , char* argv[])
{
    QApplication app(argc , argv);
    findDialog* dialog = new findDialog;
    dialog->show();
    return app.exec();
}

当我编译这个项目时，我得到了6个链接错误：

LNK2001:未解析的外部符号"public:virtual struct QMetaObject const*__thiscall findDialog:：metaObject（void）const"（？metaObject@findDialog@@UBEPBUQMetaObject@@XZ）

LNK2001:未解析的外部符号"public:virtual void*__thiscall findDialog:：qt_metacast（char const*）"（？qt_metacast@findDialog@@UAEPAXPBD@Z)

LNK2001:未解析的外部符号"public:virtual int__thiscall findDialog:：qt_metacall（enum QMetaObject:：Call，int，void**）"（？qt_metacall@findDialog@@UAEHW4Call@QMetaObject@@HPAPAX@Z)

LNK2001:未解析的外部符号"public:static struct QMetaObject const findDialog:：staticMetaObject"（？staticMetaObject@findDialog@@2UQMetaObject@@B）

LNK2019:未解析的外部符号"protected:void __thiscall findDialog:：findNext（class QString const&，enum Qt:：CaseSensitivity）"（？findNext@findDialog@@IAEXABVQ字符串@@W4CaseSensitivity@Qt@@@Z） 在函数"private:void __thiscall findDialog:：findClicked（void）"中引用（？findClicked@findDialog@@AAEXXZ）

LNK2019:未解析的外部符号"protected:void __thiscall findDialog:：findPrevious（class QString const&，enum Qt:：CaseSensitivity）"（？findPrevious@findDialog@@IAEXABVQ字符串@@W4CaseSensitivity@Qt@@@Z） 在函数"private:void __thiscall findDialog:：findClicked（void）"中引用（？findClicked@findDialog@@AAEXXZ）

提前谢谢你，为我糟糕的英语感到抱歉。