Qt显示图像 linux Qtcreator 树莓派

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QImage>
#include <QLabel>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private slots:
void on_pushButton_2_clicked();

void on_pushButton_clicked();

private:
Ui::MainWindow *ui;
QLabel *label;
};

#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QImage image;
image.load("lena.jpg");
label = new QLabel();
label->setPixmap(QPixmap::fromImage(image));
label->resize(QSize(image.width(),image.height()));
ui->scrollArea->setWidget(label);
// ui->labelimage->setPixmap(QPixmap::fromImage(myImage).scaled(ui->labelimage->size()));

}

MainWindow::~MainWindow()
{
delete ui;
}