error: LNK2001: 无法解析的外部符号 “public: virtual struct QMetaObject const * __cdecl

Qt系列文章目录

前言

我在代码中加入了对应的信号和槽，但编译仍然报错：

#ifndef PROJECTWIN_H
#define PROJECTWIN_H



namespace Ui {
class ProjectWin;
}


ProjectWin类声明头文件
class ProjectWin : public QWidget
{
    Q_OBJECT
public:
    static ProjectWin* getInstance();
    ~ProjectWin();

    FileMonitorMgr *m_fileMgr;
    QString m_paraFolder;
private:
    QTreeWidget* m_picTree;
//    QTreeWidget* m_paraTree;
    QWidget* m_naviWgt;

private:
    void initWidget();
    void initPicTree();
    void readParaFile(QString filePath);
private:
   
    QTextEdit*  m_paraText;
   

    static ProjectWin* m_pInstance;
private:
    explicit ProjectWin(QWidget *parent = nullptr);
    static void destroyInstance();

public Q_SLOTS:
   
    void slotParaInfo(QString imageName);
};

#endif // PROJECTWIN_H

ProjectWin类实现
#include "ProjectWin.h"
#include "ui_ProjectWin.h"

#pragma execution_character_set("utf-8")


ProjectWin* ProjectWin::m_pInstance = nullptr;

ProjectWin* ProjectWin::getInstance()
{
    if(!m_pInstance)
    {
        m_pInstance = new ProjectWin();
        atexit(destroyInstance);
    }
    return m_pInstance;
}

void ProjectWin::destroyInstance()
{
    if(m_pInstance)
    {
        delete m_pInstance;
        m_pInstance = nullptr;
    }
}

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

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

 

    //图像参数
    m_tabWidgetPara = new QTabWidget();
    m_paraText = new QTextEdit();
    m_tabWidgetPara->addTab(m_paraText, u8"图像参数数据");
    m_tabWidgetPara->setStyleSheet("border: 0");
    m_paraText->setStyleSheet("border: 0");

//    m_tabWidgetPara->setTabText(0, u8"图像参数数据");

   
    // 设置窗口的主布局
   
    this->setLayout(mainLayout);
}

void ProjectWin::onItemClicked(QTreeWidgetItem *item, int column)
{
    QString imageName = item->text(0);
    emit sigShowImageBorder(imageName);
}

void ProjectWin::initWidget()
{

    //    m_picTree->header()->hide();//设置隐藏头
}


void ProjectWin::slotParaInfo(QString imageName)
{
    QString fullPath = m_paraFolder + "/";
    QDir directory(m_paraFolder);
    QStringList filters;
    filters << "*.txt";

    directory.setNameFilters(filters);
    directory.setFilter(QDir::Files | QDir::NoDotAndDotDot);

    QFileInfoList fileInfoList = directory.entryInfoList();
    for (const QFileInfo &fileInfo : fileInfoList) {
        //        qDebug() << "Found:" << fileInfo.absoluteFilePath();
        QString fullPath = fileInfo.absoluteFilePath();
        if(imageName == fileInfo.fileName())
        {
            fullPath += imageName;
            readParaFile(m_paraFolder);
        }
    }
}

GraphicsView类实现实现
#ifndef GRAPHICSVIEW_H
#define GRAPHICSVIEW_H

#include <QtWidgets>
#include <QGraphicsView>
#include "GraphicsScene.h"
#include "GraphicsItem.h"

//#include <QGraphicViewMouseEvent>

class GraphicsScene;

class GraphicsView : public QGraphicsView
{
    Q_OBJECT
public:
    GraphicsView(QWidget *parent = nullptr)
    {


    }

protected:
    void mousePressEvent(QMouseEvent *event) override
    {
        if (event->button() == Qt::LeftButton && event->modifiers() == Qt::ControlModifier) {
            m_isMousePressed = true;
            m_lastMousePos = event->pos();
            setCursor(Qt::ClosedHandCursor);
        } else {
            if (event->button() == Qt::LeftButton) {
                QGraphicsItem *item = itemAt(event->pos());
                if(item)
                {
                    GraphicsItem* selectedItem = dynamic_cast<GraphicsItem*>(item);
                    if(selectedItem)
                    {
                        QString imageName = selectedItem->getImageName();
                        emit imageNameSelected(imageName);
                    }
                }
                setDragMode(RubberBandDrag);
                pressPosition = event->pos();
                m_startScenePos = mapToScene(event->pos());
                m_rubberBandDragging = true;
                m_multipleItemsSelected = (scene()->selectedItems().size() > 1);
            }
            QGraphicsView::mousePressEvent(event);
        }
    }

private:
    
Q_SIGNALS:
    void imageNameSelected(QString imageName);
};

#endif // GRAPHICSVIEW_H


ImageManager类定义
#ifndef IMAGEMANAGER_H
#define IMAGEMANAGER_H

#include <QWidget>
#include <QVector>
#include <QImage>
#include <QVBoxLayout>
#include "GraphicsItem.h"
#include "GraphicsView.h"
#include "GraphicsScene.h"
#include "ProjectWin.h"

class ImageManager : public QWidget
{
    Q_OBJECT
public:
    explicit ImageManager(/*ProjectWin* projectWin,*/QWidget *parent = nullptr);

private:
    GraphicsScene* m_scene;
    GraphicsView*  m_view;
    GraphicsItem*  m_item;
    QVector<GraphicsItem*> m_items;
    QVBoxLayout*   m_layout;

    QString m_watchPath;

//    ProjectWin* m_projectWin;
public Q_SLOTS:
    void setImagePosition(QVector<QString> &filesVec, QString &path, int groupType);

Q_SIGNALS:

};

#endif // IMAGEMANAGER_H


#include "ImageManager.h"
#include "ProjectWin.h"
#include <QMetaObject>

ImageManager::ImageManager(/*ProjectWin* projectWin,*/QWidget* parent)
    : QWidget(parent)/*, m_projectWin(projectWin)*//*, m_scene(new GraphicsScene(this)), m_view(new GraphicsView()), m_layout(new QVBoxLayout(this))*/ {

    m_scene = new GraphicsScene(this);
	m_view = new GraphicsView;

    


    m_layout = new QVBoxLayout(this);
    m_layout->addWidget(m_view);
	setLayout(m_layout);

    int winWidth = 2048;  //1642
    int winHeight = 1050;   //692
//    setFixedSize(winWidth, winHeight);
    resize(winWidth, winHeight);

	
    connect(m_view, &GraphicsView::imageNameSelected, ProjectWin::getInstance(), &ProjectWin::slotParaInfo);

}

ImageManager.obj