Hi shaktiqt123,
The good news is that writing a http GET command is very easy in Qt. 
The code in the documentation is pretty much all that you need: QNetworkAccessManager
So, something like this should do it:
Code:
void myClass::sendGetRequest()
{
QNetworkAccessManager *manager = new QNetworkAccessManager(this);
connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
manager->get(QNetworkRequest(QUrl("http://www.yourserver.com/picture.jpg")));
}
void myClass::replyFinished(QNetworkReply* aReply)
{
// Do something with reply
}
Note: I wrote that off-hand so it probably won't compile.