Program stops working while loading QByteArray into QPixmap

cpper

I'm trying to download an image from the web and save it using a Qt Console App.
Here is the code:

QT += core
QT += gui
QT += network

CONFIG += c++11

TARGET = temps
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app

SOURCES += main.cpp


HEADERS += \
    head.h

head.h:

#ifndef HEAD_H
#define HEAD_H

#include <QCoreApplication>
#include <QtNetwork/QNetworkAccessManager>
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>
#include <QUrl>
#include <QEventLoop>
#include <QString>
#include <QPixmap>

class desc: public QObject{
    Q_OBJECT
public:

    QNetworkAccessManager nam;
    QNetworkReply* reply;
    QPixmap pm;

    desc(QString url){
        QEventLoop loop;
        reply = nam.get(QNetworkRequest(url));
        QObject::connect(&nam,&QNetworkAccessManager::finished,&loop,&QEventLoop::quit);
        loop.exec();
        pm.loadFromData(reply->readAll());
    }

};

#endif // HEAD_H

main.cpp:

#include "head.h"

int main(int argc, char *argv[])
{

    QCoreApplication a(argc, argv);
    desc img("http://www.meteoromania.ro/images/clima/temperatura_orara.png");
    img.pm.save("test.png");
    return a.exec();
}

When compiling, I get follwing error: "temps.exe has stopped working", at line 26 of head.h .
This is the line : pm.loadFromData(reply->readAll()); .
reply->readAll() alone doesn't cause problems, and pm.loadFromData(QByteArray()) also works.

I've pasted the desc class in a Qt Widget app and the code worked with no problems, so I guess the problem is in the .pro file or nearby.

kshegunov

@cpper

I don't think you can mix QPixmap with QCoreApplication. Pixmaps are dependent on the window manager running (and you don't interface any). Try with QImage instead.

cpper

@kshegunov

I just replaced QPixmap pm; with QImage pm; and it worked. Thank you very much :D