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Thread: [QNetworkAccessManager] Download a file -> "Unknown error" + crash of program

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  1. 19th May 2015, 18:53 #1
    AmirH
    AmirH is offline Novice
    Join Date
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    Post [QNetworkAccessManager] Download a file -> "Unknown error" + crash of program

    Hi,

    I'm developping an app on windows which tooltips French news by the system tray.

    After succesfully developped the functions that read xml files and fill them, I wanna download the rss file of lemonde.fr (which u know is a xml file) to add the last news in the local xml file.

    I tried to do all necessary work for downloading that file but I have a "Unknown error" with reply->errorString(); and then the program crashes.

    Here is the principal code :

    Qt Code: 
    1. Window::Window()
    2. {
    3.     AppVars::urlRSSlist << "http://rss.lemonde.fr/c/205/f/3050/index.rss";
    4.     AppVars::netManList<< new QNetworkAccessManager(this);
    5.     QObject::connect (AppVars::netManList[0], SIGNAL(finished(QNetworkReply*)), this, SLOT(downloadedRSSalaune(QNetworkReply*))) ;
    6.     for(int i=0;i<AppVars::urlRSSlist.size();i++){
    7.         qDebug() << "enter for loop for i = "+QString::number(i);
    8.         AppVars::netManList[i]->get(QNetworkRequest(QUrl(AppVars::urlRSSlist[i])));
    9.     }
    10.  
    11. }
    12.  
    13. void Window::downloadedRSSalaune(QNetworkReply* reply){
    14.  
    15.     qDebug() << reply->errorString();
    16.  
    17.     QByteArray data =QByteArray(reply->readAll());
    18.  
    19.     QList<QString> titleList;
    20.     QList<QString> linkList;
    21.     QDomDocument *domfile = new QDomDocument("alaune_xml");
    22.     if(!(domfile->setContent(data))){
    23.         return;
    24.     }
    25.  
    26.     QDomNode principalNode = domfile->documentElement();
    27.     QDomNode channelNode = principalNode.namedItem("rss").namedItem("channel");
    28.     QDomNodeList listItems = channelNode.childNodes();
    29.  
    30.     int k = 0;
    31.     int i = 0;
    32.     while(k<10 && i<listItems.length()){
    33.         if(listItems.at(i).nodeName() == "item"){
    34.             qDebug() << listItems.at(i).namedItem("title").toElement().text();
    35.             titleList << listItems.at(i).namedItem("title").toElement().text();
    36.             linkList << listItems.at(i).namedItem("link").toElement().text();
    37.             ++k;
    38.         }
    39.         ++i;
    40.     }
    41.  
    42.     firstInsert10ArticlesXML(titleList, linkList, "alaune");
    43.  
    44.     tooltipInstantNews("DirectNews France","Les articles sont maintenant à jours.","");
    45. }
    46.  
    47.  
    48. void Window::firstInsert10ArticlesXML(QList<QString> titles, QList<QString> links, QString cat)
    49. {
    50.     QString filepath = QCoreApplication::applicationDirPath();
    51.     filepath.append("\\history.xml");
    52.     AppFiles::historyXML->setFileName(filepath);
    53.  
    54.     if(!(AppFiles::historyXML->open(QIODevice::ReadOnly))){
    55.         return;
    56.     }
    57.  
    58.     // QDomDocument to parse xml file
    59.     QDomDocument *domfile = new QDomDocument("history_xml");
    60.     if(!(domfile->setContent(AppFiles::historyXML))){
    61.         return;
    62.     }
    63.     AppFiles::historyXML->close();
    64.  
    65.     QList<QDomElement *> newItems;
    66.     for(int i = 0; i<10; i++){
    67.         newItems<<new QDomElement(domfile->createElement("item"));
    68.  
    69.         QDomElement titleSubItem = domfile->createElement("title");
    70.         QDomText titleText = domfile->createTextNode(titles[i]);
    71.         QDomElement linkSubItem = domfile->createElement("link");
    72.         QDomText linkText = domfile->createTextNode(links[i]);
    73.  
    74.         titleSubItem.appendChild(titleText);
    75.         linkSubItem.appendChild(linkText);
    76.         newItems[i]->appendChild(titleSubItem);
    77.         newItems[i]->appendChild(linkSubItem);
    78.     }
    79.  
    80.     QDomNode principalNode = domfile->documentElement();
    81.  
    82.     QDomNode catNode = principalNode.namedItem(cat);
    83.  
    84.     if(catNode.isNull())
    85.         return;
    86.  
    87.     for(int i = 0; i<10; i++){
    88.         catNode.insertBefore(*newItems[i],catNode.firstChild());
    89.     }
    90.  
    91.     QString write_doc = domfile->toString();
    92.  
    93.     if(!(AppFiles::historyXML->open(QIODevice::WriteOnly))){
    94.         return;
    95.     }
    96.  
    97.     AppFiles::historyXML->resize(0);
    98.     QTextStream stream(AppFiles::historyXML);
    99.     stream << write_doc;
    100.     AppFiles::historyXML->close();
    101.  
    102.     ReadXML();
    103. }
    104.  
    105. void Window::ReadXML()
    106. {
    107.     QString filepath = QCoreApplication::applicationDirPath();
    108.     filepath.append("\\history.xml");
    109.     AppFiles::historyXML->setFileName(filepath);
    110.  
    111.     if(!(AppFiles::historyXML->open(QIODevice::ReadOnly))){
    112.         return;
    113.     }
    114.  
    115.     // QDomDocument to parse xml file
    116.     QDomDocument *domfile = new QDomDocument("history_xml");
    117.     if(!(domfile->setContent(AppFiles::historyXML))){
    118.         return;
    119.     }
    120.     AppFiles::historyXML->close();
    121.  
    122.     QDomNode principalNode = domfile->documentElement();
    123.  
    124.     QList<QDomNode> listNodes;
    125.     listNodes<<principalNode.namedItem("alaune")<<principalNode.namedItem("monde")<<principalNode.namedItem("politique")<<principalNode.namedItem("societesante")
    126.                <<principalNode.namedItem("economie")<<principalNode.namedItem("science")<<principalNode.namedItem("art")<<principalNode.namedItem("sport")
    127.                  <<principalNode.namedItem("people");
    128.  
    129.     for(int k=0;k<9;k++){
    130.         QDomNode item = listNodes[k].firstChild();
    131.         int i = 0;
    132.         while(!listNodes[k].isNull() && !item.isNull() && i<10){
    133.             //for each article found, enable the QAction, and attribute text and link
    134.             listArticles[k][i]->setEnabled(true);
    135.             QString titleTrunc = item.namedItem("title").toElement().text();
    136.             if(titleTrunc.size() > 50)
    137.                 titleTrunc = titleTrunc.left(50).append("...");
    138.             listArticles[k][i]->setText(titleTrunc);
    139.             AppVars::listShortcuts[k][i] = item.namedItem("link").toElement().text();
    140.             ++i;
    141.             item = item.nextSibling();
    142.         }
    143.     }
    144. }
    145.  
    146. void Window::tooltipInstantNews(QString title, QString categorie, QString url)
    147. {
    148.     // recieved from getrssthread.cpp, show directly (no use of any xml file) the news and attribute system tray message link
    149.     sticon->setToolTip(categorie+" : \n"+title);
    150.     AppVars::shortcutMessage = url;
    151.     if(AppVars::NotifBool)
    152.         sticon->showMessage(categorie,title,QSystemTrayIcon::Information);
    153.  
    154. }
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    I may have to put some if(!ERROR) but I don't know where and how.

    Window class derivates from QWidget
    AppVars::urlRSSlist is a QList<String> (global var)
    AppVars::netManList is a QList<QNetworkAccessManager*> (global var)

    if something not clear, please tell me.

    Thank u in advance for your help.
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  2. 19th May 2015, 19:51 #2
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    wysota
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    Default Re: [QNetworkAccessManager] Download a file -> "Unknown error" + crash of program

    Show us the debugger stack trace.
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