Question

我试图在Qt中执行经典连接，我做了一千次。但由于某些原因我不知道，我现在不能：我收到错误

error: no matching function for call to 'gameView::connect(QComboBox*&, const char*, gameLogic*&, const char*)'
     connect(_dropdown, SIGNAL(activated(int)), _model, SLOT(resize(int)));
                                                                         ^

我的代码如下：（gameview.h）

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QHBoxLayout>
#include <QGridLayout>
#include <QPushButton>
#include <QComboBox>
#include <QVector>
#include <QTime>
#include "gamelogic.h"

class gameView : public QWidget
{
    Q_OBJECT

    public:
...
        QComboBox*_dropdown;

...
        gameLogic* _model;

...

        explicit gameView(QWidget *parent = 0);
        ~gameView();


    };

#endif // MAINWINDOW_H

（gameview.cpp）

#include "gameview.h"

gameView::gameView(QWidget *parent) :
    QWidget(parent)
{
    _model = new gameLogic();
...
    _dropdown = new QComboBox();
...

    _dropdown->addItem("4");
    _dropdown->addItem("6");
    _dropdown->addItem("8");
    connect(_dropdown, SIGNAL(activated(int)), _model, SLOT(resize(int))); //error here
... 
}

（gamelogic.h）

#ifndef GAMELOGIC_H
#define GAMELOGIC_H

#include <QVector>
#include <QTimer>


class gameLogic
{
    Q_OBJECT
public:
    gameLogic();

...

public slots:
    void resize(int newn);


};

#endif // GAMELOGIC_H

请帮忙！

Answer 1

您的gameLogic类应继承QObject，否则Qt信号/插槽机制将无效。尝试将class gameLogic更改为class gameLogic : public QObject

Answer 2

显然只是添加Q_OBJECT是不够的。将gameLogic设置为class gameLogic : public QObject后，连接就可以了。

Qt - 没有匹配函数来调用connect

2 个答案: