QNetworkReply 的体系结构 x86_64 的未定义符号

Question

我不断收到以下错误：体系结构的未定义符号 x86_64：“checkinapp::myOnFinishedSlot(QNetworkReply*)”，引用自：“checkinapp::qt_static_metacall(QObject*,QMetaObject::Call,int,void**) in moc_checkinapp.o

我翻了好几遍也想不通哪里错了。（我是 C++ 的新手，所以很抱歉，我可能错过了一些明显的东西）。感谢您的帮助:)

这是我的 class:

class checkinapp : public QMainWindow
{
    Q_OBJECT

public:
    checkinapp(QWidget *parent = nullptr);
    ~checkinapp();
    void databasehandler(QWidget *parent = nullptr);
    int stressed;
    int happy;
    int hungry;
    int tired;
    int gender;
    bool help;
    int grade;
    bool submitted;
    void post()
    {
        m_networkManager = new QNetworkAccessManager ( this );
        QVariantMap newUser;
        newUser[ "Stress" ] = QString::number(stressed);
        newUser[ "Sleep" ] = QString::number(tired);
        newUser[ "Hungry" ] = QString::number(hungry);
        newUser[ "Happy" ] = QString::number(happy);
        newUser[ "Grade" ] = QString::number(grade);
        newUser[ "Date" ] = "1/10/21";
        newUser[ "Gender" ] = QString::number(gender);
        newUser[ "Aid" ] = QString::number(help);
        QJsonDocument jsonDoc = QJsonDocument::fromVariant( newUser );
        QNetworkRequest newUserRequest( QUrl( "url/User.jason"));
        newUserRequest.setHeader( QNetworkRequest::ContentTypeHeader, QString( "application/json" ));

        connect(m_networkManager, &QNetworkManager::finished, this, &checkinapp::myOnFinishSlot); // the error is here 

        m_networkManager->post( newUserRequest, jsonDoc.toJson() );
    }
    void exit()
    {
        QApplication::quit();
    }

public slots:
    void myOnFinishSlot(QNetworkReply* x) { exit(); } 
private slots:

    void on_happy_valueChanged(int value);

    void on_hungry_valueChanged(int value);

    void on_sleep_valueChanged(int value);

    void on_stress_valueChanged(int value);

    void on_male_toggled(bool checked);

    void on_female_toggled(bool checked);

    void on_other_toggled(bool checked);

    void on_help_toggled(bool checked);

    void on_pushButton_clicked();

private:
    Ui::checkinapp *ui;
    QNetworkAccessManager * m_networkManager;
    QNetworkReply * m_networkReply;
};

Answer 1

你的声明

void myOnFinishSlot(QNetworkReply* x)

不符合您的定义：

void myOnFinishSlot()

您有效地定义了两个具有不同重载的方法。

合并定义和声明：

public slots:
void myOnFinishSlot(QNetworkReply* x) { exit(); }

或者将定义移到 class 块之外：

void checkinapp::myOnFinishSlot(QNetworkReply* x) { exit(); }

此外，不要使用 SIGNAL/SLOT 表示法，因为它会在运行时导致难以调试的错误。您的 connect 调用应该是：

connect(m_networkManager, &QNetworkAccessManager::finished, this, &checkinapp::myOnFinishSlot);

QNetworkReply 的体系结构 x86_64 的未定义符号

Undefined symbols for architecture x86_64 with QNetworkReply

c++

qt

qnetworkreply