Downloading Image File

SimonJudge

I am trying to download a jpg file...

@nam = new QNetworkAccessManager(this);
QObject::connect(nam, SIGNAL(finished(QNetworkReply*)), this, SLOT(httpCompleted(QNetworkReply*)));

QUrl url("http://mysite.com/test.jpg");
nam->get(QNetworkRequest(url));@

In httpCompleted...

@if (reply->error() == QNetworkReply::NoError)
{
QByteArray bytes = reply->readAll();
int count = bytes.count();

... save to file

}@

This mechanism works for non-image files but fails for images.
bytes.count() is zero even though reply->bytesAvailable() is the size of the image file.

Anyone seen this before?

Thanks

Simon

? Offline

you will see from docs that readAll() has no mechanism to return error on failure and returns an empty bytearray. maybe you need to use some other call ...

SimonJudge

Using read() instead returns minus 1. reply->errorString(); is "Unknown error".

Simon

deimos

It's possible that no error is returned if a redirection occurred. Try to check content of bytes (qDebug() << bytes) or try to look for a redirection:

@QString forwardedUrl;
forwardedUrl= reply->attribute(QNetworkRequest::RedirectionTargetAttribute).toUrl().toString();@