Qt Download Sample

README.md

Qt Download URL Sample

This sample have the code to download an image using http and https.

main.cpp

#include <QCoreApplication>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QObject>
#include "task.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    const QUrl url = QUrl("https://via.placeholder.com/150");
    //const QUrl url = QUrl("http://placehold.it/150");
    qDebug() << "url" << url;

    Task *task = new Task();

    QNetworkAccessManager *nam = new QNetworkAccessManager();
    QObject::connect(nam, &QNetworkAccessManager::finished, task, &Task::downloadFinished);
    QNetworkRequest request(url);
    nam->get(request);

    return a.exec();
}

task.cpp

#include "task.h"

Task::Task()
{

}

void Task::downloadFinished(QNetworkReply *reply)
{
    // Do processing here
    qDebug() << "Hello World";
    qDebug() << "reply->isFinished()" << reply->isFinished();
    qDebug() << "reply->isRunning()" << reply->isRunning();
    auto body = reply->readAll();
    qDebug() << "body.size()" << body.size();
}

task.h

#ifndef TASK_H
#define TASK_H

#include <QObject>
#include <QNetworkReply>

class Task : public QObject
{
    Q_OBJECT
public:
    Task();

public slots:
    void downloadFinished(QNetworkReply *reply);
};

#endif // TASK_H

Test.pro

QT -= gui
QT += network

CONFIG += c++11 console
CONFIG -= app_bundle

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
        main.cpp \
        task.cpp

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

HEADERS += \
    task.h