Qttt中没有QHttp

Question

I noticed that the QHttp class is no longer available in Qt5 and I keep getting an error message which says that I need to use the QNetworkAccessManager to do this.

Is there a way to access this class in Qt5?

Answer 1

Use QNetworkAccessManager in Qt 5. You can use an event loop to wait until the reply is finished and then read the available bytes :

QString My_class::My_Method()
{

   QNetworkAccessManager manager;

   QNetworkReply *reply = manager.get(QNetworkRequest(QUrl(myURL)));

   QEventLoop loop;
   connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
   connect(reply, SIGNAL(error(QNetworkReply::NetworkError)), &loop, SLOT(quit()));
   loop.exec();

   QByteArray bts = reply->readAll();
   QString str(bts);

   delete reply;

   return str;

}

You can also do it in an asynchronous way by connecting the finished signal of the QNetworkAccessManager to a slot :

connect(&manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(onFinished(QNetworkReply*)));

And read data there :

void onFinished(QNetworkReply* reply)
{

   if (reply->error() == QNetworkReply::NoError)
   {
       QByteArray bts = reply->readAll();

       ...
   }
}

Answer 2

This is a simple HTTP post (I am using Qt 5.3.2)

int Connection::postRequest(QString requestType, QUrl params){
    QString params_array = params.query();

    QNetworkRequest request(user->url);
    request.setHeader(QNetworkRequest::ContentLengthHeader, QByteArray::number(params_array.size()));
    request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");

    QEventLoop waitLoop;
    QNetworkAccessManager* connection = new QNetworkAccessManager(/*`this` can also be passed*/);
    QNetworkReply* reply = connection->post(request, params_array.toUtf8());
    QObject::connect(reply, SIGNAL(finished()), &waitLoop, SLOT(quit()));
    waitLoop.exec();

    int errorCode = reply->error();
    if (errorCode != 0){
        // Show Error Message
    }
    else{
        // Parse "reply"
    }

    delete reply;
    delete connection;
    return errorCode;
}

Answer 3

假设您不需要维护庞大的代码库，正确的方法是使用新的QNetworkAccessManager类。