Qt - moc 文件相关错误

Question

我正在编写一个项目。在尝试进行静态构建后，我开始遇到错误。我做了一些改变，我不记得了。但是，我确信如果这个存根可以被清除，那么主项目也可以被清除。

这是头文件。

#ifndef MYLABEL_H
#define MYLABEL_H

#include <QFileDialog>
#include <QLabel>
#include <QMouseEvent>
#include <QObject>
#include <QPaintEvent>

class MyLabel:public QWidget
{
private:
    QPixmap default_Pixmap;
    QPixmap pixmap;
    QFileDialog * fileDialog;
    Q_OBJECT
public:
    MyLabel();
    void setPixmap(QPixmap pixmap);
    void setDefault();
protected:
    void mousePressEvent(QMouseEvent *event);
    void paintEvent(QPaintEvent * event);
signals:
    void file_Selected(QString fileName);
private slots:
    void file_Got_Selected(QString fileName);

};

#endif // MYLABEL_H

这里是源文件

#include "MyLabel.h"
#include "MyMessageBox.h"
#include <QFileDialog>
#include <QPainter>

MyLabel::MyLabel():QWidget()
{
    default_Pixmap = QPixmap("select.gif").scaled(250,100);
    this->fileDialog=new QFileDialog(this);
    fileDialog->setNameFilter("Image Files (*.BMP *.GIF *.JPG *.JPEG *.PNG *.PBM *.PGM *.PPM *.XBM *.XPM)");
    connect(fileDialog,SIGNAL(fileSelected(QString)),this,SIGNAL(file_Selected(QString)));
    connect(fileDialog,SIGNAL(fileSelected(QString)),this,SLOT(file_Got_Selected(QString)));
}

void MyLabel::setPixmap(QPixmap pixmap)
{
    this->pixmap = pixmap;
}

void MyLabel::setDefault()
{
    this->pixmap = default_Pixmap;
}

void MyLabel::mousePressEvent(QMouseEvent *event)
{
    fileDialog->show();
    //QString file_Name = file_Dialog.getOpenFileName();
}

void MyLabel::paintEvent(QPaintEvent * event)
{
    QPainter painter(this);
    painter.drawPixmap(0,0,width(),height(),pixmap.scaled(QSize(width(),height())));
}

void MyLabel::file_Got_Selected(QString fileName)
{
    this->pixmap = QPixmap(fileName);
}

#include "myLabel.moc"

这是主文件

#include <QLabel>
#include <QPixmap>
#include <QtGui/QApplication>
#include "myLabel.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    MyLabel mm;
    //mm.setPixmap(QPixmap("dummy.jpg"));
    //mm.setPixmap(QPixmap());
    mm.setDefault();
    mm.show();

    return a.exec();
}

我使用 qt 命令提示符和命令创建了 moc 文件

moc myLabel.h -o myLabel.moc

在此之后，我尝试通过 Qt-Editor 编译项目。但我得到如下多定义错误，

debug/moc_myLabel.o:d:/TempInstallationFolder/Qt/Dynamic/qt/include/QtCore/../../src/corelib/global/qglobal.h:1381: multiple definition of `MyLabel::metaObject() const'

debug/myLabel.o:C:\Documents and Settings\prabhakaran\Desktop\CalendarNew-build-desktop/../CalendarNew//myLabel.moc:57：首先在这里定义

debug/moc_myLabel.o:C:\Documents and Settings\prabhakaran\Desktop\CalendarNew-build-desktop/debug/moc_myLabel.cpp:62: `MyLabel::qt_metacast(char const*)' 的多重定义

debug/myLabel.o:C:\Documents and Settings\prabhakaran\Desktop\CalendarNew-build-desktop/../CalendarNew//myLabel.moc:62：首先在这里定义

debug/moc_myLabel.o:C:\Documents and Settings\prabhakaran\Desktop\CalendarNew-build-desktop/debug/moc_myLabel.cpp:70: `MyLabel::qt_metacall(QMetaObject::Call, int,无效**)'

debug/myLabel.o:C:\Documents and Settings\prabhakaran\Desktop\CalendarNew-build-desktop/../CalendarNew//myLabel.moc:70：首先在这里定义

debug/moc_myLabel.o:C:\Documents and Settings\prabhakaran\Desktop\CalendarNew-build-desktop/debug/moc_myLabel.cpp:87: `MyLabel::file_Selected(QString)' 的多重定义

debug/myLabel.o:C:\Documents and Settings\prabhakaran\Desktop\CalendarNew-build-desktop/../CalendarNew//myLabel.moc:87：首先在这里定义

debug/moc_myLabel.o:moc_myLabel.cpp:(.data+0x0): `MyLabel::staticMetaObject' 的多重定义

debug/myLabel.o:myLabel.cpp:(.data+0x0): 首先定义在这里

collect2: ld 返回 1 个退出状态

mingw32-make[1]: * [debug\CalendarNew.exe] 错误 1

mingw32-make: * [调试] 错误 2

进程“D:/TempInstallationFolder/Qt/Dynamic/mingw/bin/mingw32-make.exe”退出，代码为 %2。 构建项目 CalendarNew 时出错（目标：桌面） 执行构建步骤“Make”时

请任何人帮我解决这个问题。

Answer 1

尝试从源文件中删除行 include "MyLabel.moc"。您无需将其包含在cpp 文件中。