QMainWindow中点击按钮弹出QWidget

Question

问题遇到的现象：
m_calib= new Calibrate（）;

#include <QWidget>
#include"getttable.h"
namespace Ui {
class Calibrate;
}

class Calibrate : public QWidget
{
    Q_OBJECT

public:
    explicit Calibrate(QWidget *parent = nullptr);
    ~Calibrate();
    void closeEvent(QCloseEvent *event);
public slots:
private slots:
private:
    Ui::Calibrate *ui;
};
#endif // CALIBRATE_H

    m_calib= new Calibrate();
    connect(m_calib,&Calibrate::sigSendCmd,m_busObj,&BusinessIf::slotSendCmd);
    

现象：信号槽无法发送数据
解决方法：

    m_calib= new Calibrate;
    connect(m_calib,&Calibrate::sigSendCmd,m_busObj,&BusinessIf::slotSendCmd);

这是为什么呢？

Answer 1

m_calib = new Calibrate();和 m_calib = new Calibrate;等价的，没看出有什么区别。