Question

我一直在寻找有关此问题的信息..但我找到的解决方案都没有帮助过我，我真的希望你能帮助我

maintabholder.h：

#ifndef MAINTABHOLDER_H
#define MAINTABHOLDER_H

#include <QMainWindow>

namespace Ui {
class MainTabHolder;
}

class MainTabHolder : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainTabHolder(QWidget *parent = 0);
    ~MainTabHolder();

private:
    Ui::MainTabHolder *ui;
};
#endif // MAINTABHOLDER_H

maintabholder.cpp：

#include "maintabholder.h"
#include "ui_maintabholder.h"

MainTabHolder::MainTabHolder(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainTabHolder)
{
    ui->setupUi(this);
}

MainTabHolder::~MainTabHolder()
{
    delete ui;
}

main.cpp中：

#include "maintabholder.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainTabHolder w;
    w.show();
    return a.exec();
}

ui_maintabholder.h #ifndef UI_MAINTABHOLDER_H #define UI_MAINTABHOLDER_H

#include <QtCore/QVariant>
#include <QtWebKitWidgets/QWebView>
#include <QtWidgets/QAction>
#include <QtWidgets/QApplication>
#include <QtWidgets/QButtonGroup>
#include <QtWidgets/QHBoxLayout>
#include <QtWidgets/QHeaderView>
#include <QtWidgets/QPushButton>
#include <QtWidgets/QSpacerItem>
#include <QtWidgets/QTabWidget>
#include <QtWidgets/QVBoxLayout>
#include <QtWidgets/QWidget>

QT_BEGIN_NAMESPACE

class Ui_Form
{
public:
    QHBoxLayout *horizontalLayout;
    QTabWidget *tabWidget;
    QWidget *comicViewer;
    QWidget *comicSearcher;
    QVBoxLayout *verticalLayout;
    QHBoxLayout *horizontalLayout_2;
    QPushButton *pushButton;
    QSpacerItem *horizontalSpacer;
    QPushButton *pushButton_2;
    QWebView *webView;

    void setupUi(QWidget *Form)
    {
        if (Form->objectName().isEmpty())
            Form->setObjectName(QStringLiteral("Form"));
        Form->resize(531, 308);
        horizontalLayout = new QHBoxLayout(Form);
        horizontalLayout->setObjectName(QStringLiteral("horizontalLayout"));
        tabWidget = new QTabWidget(Form);
        tabWidget->setObjectName(QStringLiteral("tabWidget"));
                comicViewer = new QWidget();
        comicViewer->setObjectName(QStringLiteral("comicViewer"));
        comicViewer->setCursor(QCursor(Qt::ArrowCursor));
        tabWidget->addTab(comicViewer, QString());
        comicSearcher = new QWidget();
        comicSearcher->setObjectName(QStringLiteral("comicSearcher"));
        verticalLayout = new QVBoxLayout(comicSearcher);
        verticalLayout->setObjectName(QStringLiteral("verticalLayout"));
        horizontalLayout_2 = new QHBoxLayout();
        horizontalLayout_2->setObjectName(QStringLiteral("horizontalLayout_2"));
        pushButton = new QPushButton(comicSearcher);
        pushButton->setObjectName(QStringLiteral("pushButton"));

        horizontalLayout_2->addWidget(pushButton);

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

        horizontalLayout_2->addItem(horizontalSpacer);

        pushButton_2 = new QPushButton(comicSearcher);
        pushButton_2->setObjectName(QStringLiteral("pushButton_2"));
        pushButton_2->setEnabled(false);

        horizontalLayout_2->addWidget(pushButton_2);


        verticalLayout->addLayout(horizontalLayout_2);

        webView = new QWebView(comicSearcher);
        webView->setObjectName(QStringLiteral("webView"));
        webView->setUrl(QUrl(QStringLiteral("about:blank")));

        verticalLayout->addWidget(webView);

        tabWidget->addTab(comicSearcher, QString());

        horizontalLayout->addWidget(tabWidget);


        retranslateUi(Form);

        tabWidget->setCurrentIndex(1);


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

    void retranslateUi(QWidget *Form)
    {
        Form->setWindowTitle(QApplication::translate("Form", "Form", 0));
        tabWidget->setTabText(tabWidget->indexOf(comicViewer), QApplication::translate("Form", "Comic Viewer", 0));
        pushButton->setText(QApplication::translate("Form", "Go to SubManga", 0));
        pushButton_2->setText(QApplication::translate("Form", "Download Comic", 0));
        tabWidget->setTabText(tabWidget->indexOf(comicSearcher), QApplication::translate("Form", "Search For Comics", 0));
    } // retranslateUi

};

namespace Ui {
    class Form: public Ui_Form {};
} // namespace Ui

QT_END_NAMESPACE

#endif // UI_MAINTABHOLDER_H

编译器错误是：

    [...]\maintabholder.cpp: In constructor 'MainTabHolder::MainTabHolder(QWidget*)':
    [...]\maintabholder.cpp:6:16: error: invalid use of incomplete type 'class Ui::MainTabHolder'
    In file included from [...]\maintabholder.cpp:1:0:
    [...]\maintabholder.h:7:7: error: forward declaration of 'class Ui::MainTabHolder'
    [...]\maintabholder.cpp:8:7: error: invalid use of incomplete type 'class Ui::MainTabHolder'
    In file included from [...]\maintabholder.cpp:1:0:
    [...]\maintabholder.h:7:7: error: forward declaration of 'class Ui::MainTabHolder'
    [...]\maintabholder.cpp: In destructor 'virtual MainTabHolder::~MainTabHolder()':
    [...]\maintabholder.cpp:13:12: warning: possible problem detected in invocation of delete operator: [enabled by default]
    [...]\maintabholder.cpp:13:12: warning: invalid use of incomplete type 'class Ui::MainTabHolder' [enabled by default]
    In file included from [...]\maintabholder.cpp:1:0:
    [...]\maintabholder.h:7:7: warning: forward declaration of 'class Ui::MainTabHolder' [enabled by default]
    [...]\maintabholder.cpp:13:12: note: neither the destructor nor the class-specific operator delete will be called, even if they are declared when the class is defined

你能帮忙吗？我很感激...

Answer 1

您正在使用Qt的uic生成的文件;您应该验证此工具是否成功生成文件，例如检查构建输出和文件本身。另外，请检查它是否在*.pro文件中（即maintabholder.h标记为由uic处理。）

我个人建议将multiple inheritance method用于ui：

// in maintabholder.h
// ...
#include "ui_maintabholder.h"

class MainTabHolder : public QMainWindow, public Ui::MainTabHolder
{
    // ...
};

使用起来更简单，如果您对ui_*.h文件有疑问，则错误更明确。

您应该发布ui_maintabholder.h。

Answer 2

您在.cpp文件中包含了ui define head，并定义了一个私有成员“Ui :: MainTabHolder * ui;”在你的.h文件中，所以你需要在你的课程定义之前在.h文件（maintabholder.h :)中添加一个前向声明：

class Ui_MainTabHolder;

这里Ui_MainTabHolder是您的Ui类名称，请检查您自己的项目是否正确。

无效使用不完整类型/前向声明

2 个答案: