Hey all

I have a problem with a QAbstractListModel. I have a model that contains a list of custom classes type server. Of that list I want to show some information from each server item in the list in my gui. So I made a model in which I subclassed QAbstractListModel. When my application ends I write the list to a file and I load that file on the next startup of the application

But here is my problem when I run the program for the first time and there doesn't exist a file with the list I get an error when adding new servers to the list. The first item I add doesn't throw an error but also isn't visible in the gui but when I add a second item I get the following error in my Application Output window in QtCreator:
Qt Code: 
  1. QTreeView::rowsInserted internal representation of the model has been corrupted, resetting.
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But when I close the application and I restart it, it loads the servers I just added so they are written to the file and shows them in the gui. After that I can add servers and they are shown in the gui.

I run Windows 7 64 bit, program in QtCreator 1.2.0 with Qt 4.5.2

Here is my code:
Qt Code: 
  1. #include <QDir>
  2. #include <QMessageBox>
  3.  
  4. #include "serverlist.h"
  5.  
  6.  
  7.  
  8. serverList::serverList(): QAbstractListModel()
  9. {
  10.     settings = new Settings();
  11.     serverDataFile = new QFile(settings->getappDataDir() + QDir::separator() + "servers" + QDir::separator() + "servers.dat");
  12.     serverDataFileInfo = new QFileInfo(settings->getappDataDir() + QDir::separator() + "servers" + QDir::separator() + "servers.dat");
  13.     QList<Server> listofServers = QList<Server>();
  14.     QDataStream outputStream(serverDataFile);
  15.     QDataStream inputStream(serverDataFile);
  16.     this->loadServers();
  17. }
  18.  
  19. void serverList::saveServers()
  20. {
  21.     if(!serverDataFileInfo->exists())
  22.     {
  23.         QDir newFile(serverDataFileInfo->absoluteFilePath());
  24.         newFile.mkpath(serverDataFileInfo->absolutePath());
  25.     }
  26.  
  27.     if(!serverDataFile->open(QIODevice::ReadWrite))
  28.     {
  29.         QMessageBox::critical( 0, "Post program","There was a problem writing the server settings file" );
  30.         return;
  31.     }
  32.     outputStream.setDevice(serverDataFile);
  33.     outputStream << this->listofServers;
  34.     serverDataFile->close();
  35.     return;
  36. }
  37.  
  38. void serverList::addServer(Server newServer)
  39. {
  40.     if(!this->listofServers.contains(newServer))
  41.     {
  42.         this->insertRows(this->listofServers.size(),1,newServer,QModelIndex());
  43.         this->saveServers();
  44.     }
  45. }
  46.  
  47. void serverList::loadServers()
  48. {
  49.     if(!serverDataFileInfo->exists())
  50.     {
  51.         QDir newFile(serverDataFileInfo->absoluteFilePath());
  52.         newFile.mkpath(serverDataFileInfo->absolutePath());
  53.     }
  54.  
  55.     if(!serverDataFile->open(QIODevice::ReadWrite))
  56.     {
  57.         QMessageBox::critical( 0, "Post program","There was a problem reading the server settings file" );
  58.         return;
  59.     }
  60.  
  61.     inputStream.setDevice(serverDataFile);
  62.     QList<Server> tempList;
  63.     inputStream >> tempList;
  64.     this->listofServers = tempList;
  65.     serverDataFile->close();
  66.     return;
  67. }
  68.  
  69. int serverList::columnCount(const QModelIndex &parent) const
  70. {
  71.     if( listofServers.count() == 0)
  72.     {
  73.         return 0;
  74.     }
  75.     else
  76.     {
  77.         return listofServers.first().getColumnCount();
  78.     }
  79. }
  80.  
  81. int serverList::rowCount(const QModelIndex &parent) const
  82. {
  83.     return listofServers.count();
  84. }
  85.  
  86. QVariant serverList::data(const QModelIndex &index, int role) const
  87. {
  88.     if (!index.isValid())
  89.         return QVariant();
  90.  
  91.     if (index.row() >= listofServers.size() || index.row() < 0)
  92.         return QVariant();
  93.  
  94.     if (role == Qt::DisplayRole) {
  95.         if (index.column() == 0)
  96.             return listofServers.at(index.row()).getAddres();
  97.         else if (index.column() == 1)
  98.             return listofServers.at(index.row()).getPort();
  99.         else if (index.column() == 2)
  100.             return listofServers.at(index.row()).getNickname();
  101.     }
  102.     return QVariant();
  103. }
  104.  
  105. QVariant serverList::headerData(int section, Qt::Orientation orientation, int role) const
  106. {
  107.     if (role != Qt::DisplayRole)
  108.         return QVariant();
  109.  
  110.     if (orientation == Qt::Horizontal) {
  111.         switch (section) {
  112.         case 0:
  113.             return tr("Server Address");
  114.  
  115.         case 1:
  116.             return tr("Server Port");
  117.  
  118.         case 2:
  119.             return tr("Server Nickname");
  120.  
  121.         default:
  122.             return QVariant();
  123.         }
  124.     }
  125.     return QVariant();
  126. }
  127.  
  128. bool serverList::insertRows(int position, int rows, Server newServer, const QModelIndex &index)
  129. {
  130.     Q_UNUSED(index);
  131.     beginInsertRows(QModelIndex(), position, position+rows-1);
  132.  
  133.     for(int row = 0; row<rows; row++)
  134.     {
  135.         this->listofServers.insert(position,newServer);
  136.     }
  137.  
  138.     endInsertRows();
  139.     return true;
  140. }
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