Diplay web image

[protocole]

Hi all,

I want to display a web image into a QLabel.
this is my code :

void Flux::replyFinished(QNetworkReply* r)
{
   /* Récuperation d'un XML et construction du QUrl url_pochette */
 
  QUrl *url_pochette = new QUrl;
  url_pochette->setScheme("http");
  url_pochette->setHost("host.net");
  url_pochette->setPath("/pochette/image.jpg");
 
  r->deleteLater();
 
  QObject::connect(http, SIGNAL(finished(QNetworkReply*)), this, SLOT(load_pochette(QNetworkReply*)));
  QNetworkRequest request(*url_pochette);
  http->get(request);
}
 
void Flux::load_pochette(QNetworkReply* r)
{
  QImage img;
  if (img.load(r, "JPEG"))
  {
    p->image_pochette->hide();
    p->image_pochette->setPixmap(QPixmap::fromImage(img));
    p->image_pochette->show();
  }
  else
    cout << "Impossible de charger l'image" << endl;
}

void Flux::replyFinished(QNetworkReply* r)
{
   /* Récuperation d'un XML et construction du QUrl url_pochette */

  QUrl *url_pochette = new QUrl;
  url_pochette->setScheme("http");
  url_pochette->setHost("host.net");
  url_pochette->setPath("/pochette/image.jpg");

  r->deleteLater();

  QObject::connect(http, SIGNAL(finished(QNetworkReply*)), this, SLOT(load_pochette(QNetworkReply*)));
  QNetworkRequest request(*url_pochette);
  http->get(request);
}

void Flux::load_pochette(QNetworkReply* r)
{
  QImage img;
  if (img.load(r, "JPEG"))
  {
    p->image_pochette->hide();
    p->image_pochette->setPixmap(QPixmap::fromImage(img));
    p->image_pochette->show();
  }
  else
    cout << "Impossible de charger l'image" << endl;
}

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But "Impossible de charger l'image" is display.

Sorry for my english, i'm french.

Thanks for reply.

[wysota]

I would be nice to at least check if the request ended successfully by checking the status code of the reply.

[protocole]

I add this line :

if (r->error() == QNetworkReply::NoError) cout << "No error" << endl;

and "no error" is display!

[wysota]

That's not what I meant. Check the status code of the reply. See QNetworkReply::attribute().

[protocole]

this line : cout << (r->attribute(QNetworkRequest::HttpStatusCodeAttribut e)).toInt() << endl;
display 200

[wysota]

What about content length?

Also verify that:
1. the result is an image
2. you are able to load a JPEG image from disk using the same code.

[wysota]

What about content length?

Also verify that:
1. the result is an image
2. you are able to load a JPEG image from disk using the same code.

[protocole]

Yes i can display a jpeg image load from disk using the same code.

[wysota]

What about the first issue?

[protocole]

How can i do the first issue?

[wysota]

Save the data you get from the reply to disk and try to open it using some image viewer.

[protocole]

When i do this the file is empty.

[wysota]

In that case no wonder the image can't be created from it You have to correct your request so that it starts returning proper data.

[protocole]

Finally i use QWebView, it's easier, thanks for all.

[radory]

Hi protocole, I encouter the same issue as you, stole your code and made some modifies, now it works for me....

#include <QApplication>
#include <QLabel>
#include <QtNetwork/QNetworkAccessManager>
#include <QUrl>
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>
 
static QNetworkReply *reply;
 
class TOOTLabel : public QLabel
{
    Q_OBJECT
public:
    TOOTLabel(QWidget *parent =0)  : QLabel(parent) {}
public slots:
    void TOOTReadyRead()
    {
        QImage img  ;
        img.load(reply, "JPEG");
        setPixmap(QPixmap::fromImage(img));
        show();
        resize(img.width(),img.height());
    }
};
 
 
int main(int argc, char **argv)
{
    QApplication app(argc, argv);
 
    QNetworkAccessManager manager;
    QNetworkRequest request;
    request.setUrl(QUrl("http://www.google.com/intl/en_ALL/images/logo2.gif"));
 
    reply = manager.get(request);
    TOOTLabel imgLabel;
    QObject::connect( reply, SIGNAL(finished()), &imgLabel, SLOT(TOOTReadyRead()));
 
    return app.exec();
}
 
#include "main.moc"

#include <QApplication>
#include <QLabel>
#include <QtNetwork/QNetworkAccessManager>
#include <QUrl>
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>

static QNetworkReply *reply;

class TOOTLabel : public QLabel
{
    Q_OBJECT
public:
    TOOTLabel(QWidget *parent =0)  : QLabel(parent) {}
public slots:
    void TOOTReadyRead()
    {
        QImage img  ;
        img.load(reply, "JPEG");
        setPixmap(QPixmap::fromImage(img));
        show();
        resize(img.width(),img.height());
    }
};


int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    QNetworkAccessManager manager;
    QNetworkRequest request;
    request.setUrl(QUrl("http://www.google.com/intl/en_ALL/images/logo2.gif"));

    reply = manager.get(request);
    TOOTLabel imgLabel;
    QObject::connect( reply, SIGNAL(finished()), &imgLabel, SLOT(TOOTReadyRead()));

    return app.exec();
}

#include "main.moc"

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