qApp->processEvents();

[rmagro]

Hi Guys,

With the following Qt Code I am trying to send an QHttp request and get the related
response, doing this turning the asynchronous operation into a synchronous one,
without using signals and slots..

Here the code:

http = new QHttp(this);
....
int id = http->request(header, byteArray);
 
while(http->currentId() != 0) 
{
	qApp->processEvents();
}
 
QString result = http->readAll();

http = new QHttp(this);
....
int id = http->request(header, byteArray);

while(http->currentId() != 0) 
{
	qApp->processEvents();
}

QString result = http->readAll();

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In my PC I get the result correctly, in other ones the Gui seems to freeze and the application don't get on..

I am wandering if the "qApp->processEvents();" instruction is the problem and how i can avoid this behaviour..

Using

while(http->currentId() != 0) 
{
	QCoreApplication::processEvents();
}

while(http->currentId() != 0) 
{
	QCoreApplication::processEvents();
}

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would be the same?

If so, what about the fallowing method ??

QNetworkAccessManager manager;
    QEventLoop q;
    QTimer tT;
 
    tT.setSingleShot(true);
    connect(&tT, SIGNAL(timeout()), &q, SLOT(quit()));
    connect(&manager, SIGNAL(finished(QNetworkReply*)),
            &q, SLOT(quit()));
    QNetworkReply *reply = manager.get(QNetworkRequest(
                   QUrl("http://www.qtcentre.org")));
 
    tT.start(5000); // 5s timeout
    q.exec();
 
    if(tT.isActive()){
        // download complete
        tT.stop();
    } else {
        // timeout
    }

QNetworkAccessManager manager;
    QEventLoop q;
    QTimer tT;
    
    tT.setSingleShot(true);
    connect(&tT, SIGNAL(timeout()), &q, SLOT(quit()));
    connect(&manager, SIGNAL(finished(QNetworkReply*)),
            &q, SLOT(quit()));
    QNetworkReply *reply = manager.get(QNetworkRequest(
                   QUrl("http://www.qtcentre.org")));
    
    tT.start(5000); // 5s timeout
    q.exec();
    
    if(tT.isActive()){
        // download complete
        tT.stop();
    } else {
        // timeout
    }

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How to adapt it to perform my task (sending request and waiting for its response before going on with the flow) ???


Many thanks in advance

Roby