QT显示url图片

QT 显示网络图片我目前的办法就是先下载下来 然后显示  如果有好的办法请相互交流一下 

需要调用的头文件

#include <QNetworkAccessManager>
#include <QNetworkReply>

需要在工程中添加

QT += network

主要的代码:

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);

    connect(&netManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));

    QUrl url;
    url = QUrl("http://kexirobot.oss-cn-shanghai.aliyuncs.com/upload/robot0/pic1/1.png");
    QNetworkRequest request;
    request.setUrl(url);
    netManager.get(request);
}
void Dialog::replyFinished(QNetworkReply *reply)
{
    qDebug() << "reply :" << reply<< endl;

    if(reply->error() == QNetworkReply::NoError)
    {
        QByteArray data_bytes = reply->readAll();
        QPixmap* cur_pictrue =new QPixmap();
        cur_pictrue->loadFromData(data_bytes);
        cur_pictrue->save("./cur_night_picture.png");
//        delete cur_pictrue;
//        picture[1].load("cur_night_picture.png");
    }
    reply->deleteLater();

}


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


工程代码

https://pan.baidu.com/s/1JgEbJH-QNW_T3ECmmI5EkQ