QChart中QScatterSeries的点击信号触发后，执行槽函数后出现空指针异常，异常位置在源码scatterchartitem类中的setMousePressed()方法

Rokkie

0_1521180586786_捕获.PNG

Rokkie

信号与槽的连接

for(int i = 0; i < charts_list_->count(); i++){
        connect(charts_list_->at(i)->series2_,SIGNAL(clicked(QPointF)),this,SLOT(series2HandleClickedPoint(QPointF)));
}

槽函数

void View::series2HandleClickedPoint(const QPointF &point){
    PulseGraphOperator::UnSelectPointInAllCharts(charts_list_, point.x());
}

UnSelectPointInAllCharts()方法是为了多个图同步进行反选

void PulseGraphOperator::UnSelectPointInAllCharts(QList<Chart *> *list, qreal xpos){
    for(int i = 0; i < list->count(); i++){
        PulseGraphOperator::UnSelectPoint(list->at(i), xpos);
    }
}

UnSelectPoint()方法实现反选，将反选的点从已选中序列series2中移除，添加到原序列series1

void PulseGraphOperator::UnSelectPoint(Chart* chart, qreal xpos){
    QPointF clicked_point;
    if(chart->series2_->points().size() > 1){
        foreach(QPointF series2_point, chart->series2_->points()){
            if(series2_point.x() == xpos){
                clicked_point = series2_point;
                break;
            }
        }
        chart->series1_->append(clicked_point);
        chart->series2_->remove(clicked_point);
        qDebug()<<"series2.point > 1";
    }else{
        chart->series1_->append(chart->series2_->points());
        chart->series2_->clear();
        qDebug()<<"series2.point = 1";
    }
    qDebug()<<"UnSelect point";
}

无奈出现空指针异常，读取或者访问冲突，不知道问题出在哪里？