Question

首先，非常感谢你花时间看我的问题。其次，我已阅读this，而我的班级没有任何我忘记包含的虚拟方法。在我描述我的问题后，我会回顾一下我尝试过的其他事情。

当我使用gcc版本3.4.6 20060404构建代码时，我得到了一个未定义的'vtable for SubcomponentTypeWidget'错误.Visual Studio 2005没有问题。我喜欢Linux，但是我目前的政治局势已经将它委托给经常遭受虐待的红头发儿童。希望通过我们的力量加起来，我可以解决这个问题。

我使用的是Qt版本4.6.2。我在Red Hat 4上使用gcc 3.4.6 20060404。

这是我的标题：

#ifndef SubcomponentTypeWidget_h
#define SubcomponentTypeWidget_h

#include <vector>
#include "ui_SubcomponentTypeWidget.h"
#include "Subcomponent.h"

class SubcomponentTypeWidget : public QWidget, public Ui::SubcomponentTypeWidget
{
    Q_OBJECT

    Q_PROPERTY(QString title READ title WRITE setTitle)

public:
    SubcomponentTypeWidget(QWidget* parent,
        Models::Subcomponent::SubcomponentType subcomponentType = Models::Subcomponent::kSolid)
    :   QWidget(parent),
    m_subcomponentType(subcomponentType),
        m_subcomponentTypeButtonGroup(new QButtonGroup(this))
    {
        this->initialize();
    }

    Models::Subcomponent::SubcomponentType subcomponentType() const { return m_subcomponentType; }

    void setSubcomponentType(Models::Subcomponent::SubcomponentType type);
    void setNonCompatibleTypes(const std::vector<Models::Subcomponent::SubcomponentType>& types);

    QString title() const { return m_subcomponentGroupBox->title(); }
    void setTitle(const QString &title) { m_subcomponentGroupBox->setTitle(title); }

signals:
    void subcomponentTypeChanged();

protected slots:
    void handleSubcomponentTypeChoice(int subcomponentTypeChoiceId);

protected:
    void initialize();
    Models::Subcomponent::SubcomponentType m_subcomponentType;
    QButtonGroup* m_subcomponentTypeButtonGroup;
};

#endif // SubcomponentTypeWidget_h

实施在这里：

#include "SubcomponentTypeWidget.h"

void SubcomponentTypeWidget::setSubcomponentType(Models::Subcomponent::SubcomponentType type)
{
    if (type != m_subcomponentType)
    {
        m_subcomponentType = type;
        emit subcomponentTypeChanged();
    }
}

void SubcomponentTypeWidget::setNonCompatibleTypes(const std::vector<Models::Subcomponent::SubcomponentType>& types)
{
    m_subcomponentTypeButtonGroup->button(static_cast<int>(Models::Subcomponent::kSolid) + 1)->setEnabled(true);
    m_subcomponentTypeButtonGroup->button(static_cast<int>(Models::Subcomponent::kComplement) + 1)->setEnabled(true);
    m_subcomponentTypeButtonGroup->button(static_cast<int>(Models::Subcomponent::kHole) + 1)->setEnabled(true);

    for (std::vector<Models::Subcomponent::SubcomponentType>::const_iterator it = types.begin(); it != types.end(); ++it)
    {
        m_subcomponentTypeButtonGroup->button(static_cast<int>(*it) + 1)->setEnabled(false);
        if (*it == m_subcomponentType)
            m_subcomponentTypeButtonGroup->button(static_cast<int>(Models::Subcomponent::kSolid) + 1)->setChecked(true);
    }
}

void SubcomponentTypeWidget::handleSubcomponentTypeChoice(int subcomponentTypeChoiceId)
{
    if (static_cast<Models::Subcomponent::SubcomponentType>(subcomponentTypeChoiceId - 1) != m_subcomponentType)
    {
        m_subcomponentType = static_cast<Models::Subcomponent::SubcomponentType>(subcomponentTypeChoiceId - 1);
        emit subcomponentTypeChanged();
    }
}

void SubcomponentTypeWidget::initialize()
{
    this->setupUi(this);

    m_subcomponentTypeButtonGroup->addButton(m_solidRadioButton, static_cast<int>(Models::Subcomponent::kSolid) + 1);
    m_subcomponentTypeButtonGroup->addButton(m_complementRadioButton, static_cast<int>(Models::Subcomponent::kComplement) + 1);
    m_subcomponentTypeButtonGroup->addButton(m_holeRadioButton, static_cast<int>(Models::Subcomponent::kHole) + 1);

    m_subcomponentTypeButtonGroup->button(static_cast<int>(m_subcomponentType) + 1)->setChecked(true);

    connect(m_subcomponentTypeButtonGroup, SIGNAL(buttonClicked(int)), this, SLOT(handleSubcomponentTypeChoice(int)));
}

我收到的实际错误消息是：

../lib/libMeshAndGeometry.a(AddAdvancedDialog.o)(.gnu.linkonce.t._ZN20Ui_AddAdvancedDialog7setupUiEP7QDialog+0x955): In function `Ui_AddAdvancedDialog::setupUi(QDialog*)':
: undefined reference to `vtable for SubcomponentTypeWidget'
../lib/libMeshAndGeometry.a(AddAdvancedDialog.o)(.gnu.linkonce.t._ZN20Ui_AddAdvancedDialog7setupUiEP7QDialog+0x960): In function `Ui_AddAdvancedDialog::setupUi(QDialog*)':
: undefined reference to `vtable for SubcomponentTypeWidget'
../lib/libMeshAndGeometry.a(AddAdvancedDialog.o)(.gnu.linkonce.t._ZN20Ui_AddAdvancedDialog7setupUiEP7QDialog+0x99b): In function `Ui_AddAdvancedDialog::setupUi(QDialog*)':
: undefined reference to `SubcomponentTypeWidget::initialize()'
../lib/libMeshAndGeometry.a(AddBoxDialog.o)(.gnu.linkonce.t._ZN15Ui_AddBoxDialog7setupUiEP7QDialog+0xfe8): In function `Ui_AddBoxDialog::setupUi(QDialog*)':
: undefined reference to `vtable for SubcomponentTypeWidget'
../lib/libMeshAndGeometry.a(AddBoxDialog.o)(.gnu.linkonce.t._ZN15Ui_AddBoxDialog7setupUiEP7QDialog+0xff3): In function `Ui_AddBoxDialog::setupUi(QDialog*)':
: undefined reference to `vtable for SubcomponentTypeWidget'
../lib/libMeshAndGeometry.a(AddBoxDialog.o)(.gnu.linkonce.t._ZN15Ui_AddBoxDialog7setupUiEP7QDialog+0x102e): In function `Ui_AddBoxDialog::setupUi(QDialog*)':
: undefined reference to `SubcomponentTypeWidget::initialize()'
../lib/libMeshAndGeometry.a(AddConeDialog.o)(.gnu.linkonce.t._ZN16Ui_AddConeDialog7setupUiEP7QDialog+0x7ef): In function `Ui_AddConeDialog::setupUi(QDialog*)':
: undefined reference to `vtable for SubcomponentTypeWidget'
../lib/libMeshAndGeometry.a(AddConeDialog.o)(.gnu.linkonce.t._ZN16Ui_AddConeDialog7setupUiEP7QDialog+0x7fa): In function `Ui_AddConeDialog::setupUi(QDialog*)':
: undefined reference to `vtable for SubcomponentTypeWidget'
../lib/libMeshAndGeometry.a(AddConeDialog.o)(.gnu.linkonce.t._ZN16Ui_AddConeDialog7setupUiEP7QDialog+0x835): In function `Ui_AddConeDialog::setupUi(QDialog*)':
: undefined reference to `SubcomponentTypeWidget::initialize()'
../lib/libMeshAndGeometry.a(AddCylinderDialog.o)(.gnu.linkonce.t._ZN20Ui_AddCylinderDialog7setupUiEP7QDialog+0x9c4): In function `Ui_AddCylinderDialog::setupUi(QDialog*)':
: undefined reference to `vtable for SubcomponentTypeWidget'
../lib/libMeshAndGeometry.a(AddCylinderDialog.o)(.gnu.linkonce.t._ZN20Ui_AddCylinderDialog7setupUiEP7QDialog+0x9cf): In function `Ui_AddCylinderDialog::setupUi(QDialog*)':
: undefined reference to `vtable for SubcomponentTypeWidget'
../lib/libMeshAndGeometry.a(AddCylinderDialog.o)(.gnu.linkonce.t._ZN20Ui_AddCylinderDialog7setupUiEP7QDialog+0xa0a): In function `Ui_AddCylinderDialog::setupUi(QDialog*)':

我的所有makefile都是使用qmake从我的.pro文件生成的。主要的make文件，主.pro文件以及小部件和MeshAndGeometry make和.pro文件作为存档附加here。其中一个.ui文件附加了here。

我尝试过很多东西。

我确定这不是陈旧的目标文件问题。我从头开始构建这个，但我仍然遇到了问题。
我检查了所有大写问题。我注意到在Windows上执行大部分操作然后将其移至Linux时遇到的一个问题是人们在大写时出错，Windows不关心大小写。
我运行了nm -a -C SubcomponentTypeWidget.o以查看是否存在必要的vtable，但事实并非如此。然而，那里有'缺失'的方法。
创建虚拟析构函数不会强制生成SubcomponentTypeWidget的vtable。
我尝试删除大块SubcomponentTypeWidget的功能。这会导致删除方法的特定链接器错误消息，但不会删除对vtable消息的未定义引用。我已经从构造函数以外的SubcomponentTypeWidget中删除了所有内容，在这种情况下，我仍然收到“未定义的vtable引用”消息，但没有提及我们正在寻找的特定方法。
更改窗口小部件和MeshingAndGeometry链接的顺序没有帮助。
我尝试过gcc版本3.4.6 20060404和4.1.2 20080704。

帮助我，欧比旺克诺比。你是我唯一的希望。

非常非常感谢你，

-Brian J. Stinar -

Answer 1

通过您的代码，错误很可能来自以下声明：

=======================================================
void SubcomponentTypeWidget::initialize()
{
    this->setupUi(this);
    //rest of codes
}
=======================================================

通过使SubcomponentTypeWidget成为Ui :: SubcomponentTypeWidget的子类，您可以打破Qt的结构。在这种情况下，您实际上是在使用自己设置自己的UI。再加上你使用多类继承这一事实，你只是混淆编译器在运行时引用哪个虚方法。

而不是子类化Ui :: SubcomponentTypeWidget，只需将它变成SubcomponentTypeWidget中的私有变量

//SubcomponentTypeWidget.h
     private:
         Ui::SubcomponentTypeWidge ui;

在你的init函数中实现以下内容，你应该好好去

void SubcomponentTypeWidget::initialize()
{
    ui.setupUi(this);
    //rest of codes
}

Answer 2

我的问题是解决方案第6点。我实际上没有正确更改此顺序。我正在改变INCPATH中的顺序而不是LIBS中的顺序。

将MeshAndGeometry.depends = widgets行添加到我的master.pro文件，运行qmake并运行make后，这个问题就消失了。

非常感谢大家的评论和帮助。

-Brian J. Stinar-

VTable未生成

2 个答案: