C++ QT 打开图片

    QGridLayout *g = new QGridLayout(this);
    setLayout(g);

//    g->addWidget(new QPushButton("Hello",this),1,2,0,20);
//    g->addWidget(new QPushButton("Hello",this),0,0);
//    g->addWidget(new QPushButton("Hello",this),0,1);
//    g->addWidget(new QPushButton("Hello",this),0,2);

    QLineEdit *line = new QLineEdit(this);
    g->addWidget(line,3,0);
    QLabel *label = new QLabel("Hello",this);

    g->addWidget(label,0,0);

    auto b = new QPushButton("打开图片",this);

    g->addWidget(b,3,1);

    this->resize(480,320);



    connect(b,&QPushButton::clicked,[this,line,label](bool i){
           qDebug()<<"test"<<i;
           auto filepath = QFileDialog::getOpenFileName(this,"选择图片",line->text(),"Images(*.png *.jpg *.bmp)");
           qDebug() << filepath;
           line->setText(filepath);

           label->setPixmap(QPixmap(filepath));
    });