'QObject::QObject(const QObject&)'是私有的

'QObject::QObject(const QObject&)' is private

本文关键字：QObject const      更新时间：2023-10-16

我得到错误：

C:Qt5.3mingw482_32includeQtCoreqobject.h:465: error : 'QObject::QObject(const QObject&)' is private
     Q_DISABLE_COPY(QObject)
                    ^
QtMyMediaLibrariesMyMediaLibrariescpp.filmsMovie.h:10: error : within this context
 class Movie: public QObject
   ^

我读了很多关于它的书，但我真的不知道我的情况出了什么问题。我知道QObject构造函数是不可复制的，但我不会在这里做它。或者实际上我不知道我在做^^。这是我的代码：电影.h:

class Movie: public QObject
{
    Q_OBJECT
public:
    Movie();
    Movie(const int &movie_id, const QString &movie_title, const QString &movie_md5, const QDate &movie_releaseDate, const QString &movie_genre,
          const int &movie_note, const bool &movie_alreadySeen, const bool &movie_favourite, const bool &movie_toBeSeen,
          const QString &movie_synopsis, const int &movie_duration, const QString &movie_backdropPath, const QString &movie_path,
          const QString &movie_backdropMD5, const QString &movie_posterMD5, const QString &movie_posterPath, const QString &movie_collection);
    void getInfos();
    //TheMovieDB *tmdb;
    int id;
    QString title;
    QDate releaseDate;
    QString genre;
    int note;
    bool alreadySeen;
    bool favourite;
    bool toBeSeen;
    QString synopsis;
    int duration;
    QString path;
    QString md5;
    QString backdropPath;
    QString backdropMD5;
    QString posterPath;
    QString posterMD5;
    QString collection;
public slots:
    void updateDatas();
};

电影.cpp:

Movie::Movie()
{
    title = "";
    md5 = "";
    id = 0;
    path = "";
    releaseDate = QDate();
    genre = "";
    note = 0;
    alreadySeen = false;
    favourite = false;
    toBeSeen = false;
    synopsis = "";
    duration = 0;
    backdropPath = "";
    backdropMD5 = "";
    posterPath = "";
    posterMD5 = "";
    collection = "";
}
Movie::Movie(const int &movie_id, const QString &movie_title, const QString &movie_md5, const QDate &movie_releaseDate,
             const QString &movie_genre, const int &movie_note, const bool &movie_alreadySeen, const bool &movie_favourite,
             const bool &movie_toBeSeen, const QString &movie_synopsis, const int &movie_duration,
             const QString &movie_backdropPath, const QString &movie_path, const QString &movie_backdropMD5,
             const QString &movie_posterMD5, const QString &movie_posterPath, const QString &movie_collection)
{
    id = movie_id;
    title = movie_title;
    md5 = movie_md5;
    path = movie_path;
    releaseDate = movie_releaseDate;
    genre = movie_genre;
    note = movie_note;
    alreadySeen = movie_alreadySeen;
    favourite = movie_favourite;
    toBeSeen = movie_toBeSeen;
    synopsis = movie_synopsis;
    duration = movie_duration;
    backdropPath = movie_backdropPath;
    backdropMD5 = movie_backdropMD5;
    posterPath = movie_posterPath;
    posterMD5 = movie_posterMD5;
    collection = movie_collection;
}
void Movie::getInfos()
{
    QObject::connect( tmdb , SIGNAL( dataRetrieved() ) , this , SLOT( updateDatas() ));
    tmdb->search(title);
}

void Movie::updateDatas()
{
    title = tmdb->t_infosList["title"].toString();
    md5 = "";
    id = tmdb->t_infosList["id"].toInt();
    path = "";
    releaseDate = tmdb->t_infosList["release_date"].toDate();
    note = tmdb->t_infosList["note"].toInt();
    synopsis = tmdb->t_infosList["overview"].toString();
    backdropPath = tmdb->t_infosList["backdrop"].toString();
    backdropMD5 = GeneralFunctions::hashMD5(tmdb->t_infosList["backdrop"].toString());
    posterPath = tmdb->t_infosList["poster"].toString();
    posterMD5 = GeneralFunctions::hashMD5(tmdb->t_infosList["poster"].toString());
    collection = tmdb->t_infosList["collection"].toString();
    QStringList genres = tmdb->t_infosList["genres"].toStringList();
    genre = genres[0];
    for(int i=0 ; i<genres.size() ; i++)
    {
        genre =genre + ", " + genres[i];
    }
}

感谢您的帮助

您只需阅读Q_DISABLE_COPY 的文档

禁用对给定类使用复制构造函数和赋值运算符。

QObject的子类实例不应被视为值可以复制或分配，但作为唯一标识。这意味着当您创建自己的QObject子类（director或间接），不应该给它一个复制构造函数或赋值操作人员然而，仅仅从您的类，因为如果您错误地编写了一些需要副本的代码构造函数或赋值运算符（这很容易做到），您的编译器会为您精心打造。你必须做得更多。

好奇的用户会发现QObject通常将此宏包含在一个私有部分中：

class MyClass : public QObject
{
  private:
    Q_DISABLE_COPY(MyClass)
};
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