[SOLVED]display image through http url

TobbY

hello, i was trying to display an image through http url to QButton or QLabel..

but i was not getting any positive result .

pls help.. thanks

HuXiKa

You want to download an image and diplay it? Or what do you mean under "display an image through url" ?

andre

In the widget world, you can not do that directly.
You'll have to download the image using QNetworkAccessManager, and set the resulting image on the label.

TobbY

thanks, it is really helpfull.

TobbY

can anyone give me an example to do that???

HuXiKa

@
QNetworkAccessManager m_netwManager = new QNetworkAccessManager(this);
connect(m_netwManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(slot_netwManagerFinished(QNetworkReply*)));

QUrl url("http://....");
QNetworkRequest request(url);
m_netwManager->get(request);
@

the slot:

@
void MainWindow::slot_netwManagerFinished(QNetworkReply *reply)
{
if (reply->error() != QNetworkReply::NoError) {
qDebug() << "Error in" << reply->url() << ":" << reply->errorString();
return;
}

QByteArray jpegData = reply->readAll();
QPixmap pixmap;
pixmap.loadFromData(jpegData);
label->setPixmap(pixmap); // or whatever your labels name is

}@

Took me 20 secs with google to find "this":http://www.qtforum.org/article/33674/how-can-i-download-an-image-from-an-http-url.html.

andre

While the above is a good outline of what to do, don't forget to add error checking at the appropriate places in this code.

TobbY

release/mainwindow.o:mainwindow.cpp:(.text+0xa1e): undefined reference to _imp___ZN21QNetworkAccessManagerC1EP7QObject' release/mainwindow.o:mainwindow.cpp:(.text+0xa75): undefined reference to _imp___ZN15QNetworkRequestC1ERK4QUrl'
release/mainwindow.o:mainwindow.cpp:(.text+0xa88): undefined reference to _imp___ZN21QNetworkAccessManager3getERK15QNetworkRequest' release/mainwindow.o:mainwindow.cpp:(.text+0xa91): undefined reference to _imp___ZN15QNetworkRequestD1Ev'
release/mainwindow.o:mainwindow.cpp:(.text+0xf1d): undefined reference to _imp___ZN15QNetworkRequestD1Ev' release/mainwindow.o:mainwindow.cpp:(.text+0x19aa): undefined reference to _imp___ZN21QNetworkAccessManagerC1EP7QObject'
release/mainwindow.o:mainwindow.cpp:(.text+0x1a01): undefined reference to _imp___ZN15QNetworkRequestC1ERK4QUrl' release/mainwindow.o:mainwindow.cpp:(.text+0x1a14): undefined reference to _imp___ZN21QNetworkAccessManager3getERK15QNetworkRequest'
release/mainwindow.o:mainwindow.cpp:(.text+0x1a1d): undefined reference to _imp___ZN15QNetworkRequestD1Ev' release/mainwindow.o:mainwindow.cpp:(.text+0x1e60): undefined reference to _imp___ZN15QNetworkRequestD1Ev'
collect2: ld returned 1 exit status

this error occured... is there any library i need to include*

TobbY

this is my pro file

@

Add files and directories to ship with the application

by adapting the examples below.

file1.source = myfile

dir1.source = mydir

DEPLOYMENTFOLDERS = # file1 dir1

Avoid auto screen rotation

#DEFINES += ORIENTATIONLOCK

Needs to be defined for Symbian

#DEFINES += NETWORKACCESS
QT+= core gui networks
symbian:TARGET.UID3 = 0xE5E25B16

LIBS += C:\QtSDK\mingw\lib\libws2_32.a

If your application uses the Qt Mobility libraries, uncomment

the following lines and add the respective components to the

MOBILITY variable.

CONFIG += mobility

MOBILITY +=

SOURCES += main.cpp mainwindow.cpp
soapClient.cpp
soapC.cpp
stdsoap2.cpp
HEADERS += mainwindow.h
soapStub.h
soapH.h
soapBasicHttpBinding_USCOREIClientServiceProxy.h
stdsoap2.h
FORMS += mainwindow.ui

Please do not modify the following two lines. Required for deployment.

include(deployment.pri)
qtcAddDeployment()

OTHER_FILES +=
BasicHttpBinding_USCOREIClientService.nsmap
@

[EDIT: code formatting, please wrap in @-tags, Volker]

Franzk

Isn't the module called network instead of networks?

TobbY

:-) sorry, my mistake

Franzk

[quote author="TobbY" date="1308721124"]:-) sorry, my mistake[/quote]Qt DevNet: If we point at something, it's bound to be a mistake. :P