i got following code and it looks like due to this code application crash (but still not sure, coz app is multithreaded)...

code Code: 
  1. void simplex_user::user_to_mem()

  2. {

  3.     if(!usershm.isAttached())

  4.         usershm.attach(QSharedMemory::ReadWrite);

  5.     QByteArray usercache;

  6.     QDataStream ucd(&usercache, QIODevice::ReadWrite);

  7.     usercache.clear();

  8.     usercache.resize(44+1);

  9.     ucd.device()->seek(0);

  10.  
  11.     ucd << (quint8)this->status << (quint8)this->speed << (quint8)this->playernum   // 0 1 2

  12.             << (quint8)this->lookat << (quint8)this->key1 << (quint8)this->key2     // 3 4 5

  13.             << (quint8)this->gotpowerup1 << (quint8)this->gotpowerup2               // 6 7

  14.             << (qint8)this->yoffset << (qint8)this->xoffset << (quint16)this->pos   // 8 9 10-11

  15.             << (quint64)this->score << (quint64)this->adminkey << (quint64)this->playerid  // 12-19 20-27 28-35

  16.             << (quint64)this->achievements << (quint8)this->flags;                         // 36-43 44

  17.     usershm.lock();

  18.     char *to = (char*)usershm.data();

  19.     const char *from = this->data.data();

  20.     memcpy(to, from, qMin(usershm.size(), usershm.size()));

  21.     usershm.unlock();

  22.  
  23.  
  24. }

  25.  
  26. void simplex_user::mem_to_user()

  27. {

  28.     bool ok;

  29.     QByteArray usercache;

  30.     usercache.resize(44+1);

  31.  
  32.     if(!usershm.isAttached())

  33.         usershm.attach(QSharedMemory::ReadWrite);

  34.     usershm.lock();

  35.     usercache = QByteArray((char*)usershm.constData(), usershm.size()+1);

  36.     this->data=usercache;

  37.     usershm.unlock();

  38.     this->status=usercache.mid(0,1).toHex().toUInt(&ok, 16);

  39.     this->speed=usercache.mid(1,1).toHex().toUInt(&ok, 16);

  40.     this->playernum=usercache.mid(2,1).toHex().toUInt(&ok, 16);

  41.     this->lookat=usercache.mid(3,1).toHex().toUInt(&ok, 16);

  42.     this->key1=usercache.mid(4,1).toHex().toUInt(&ok, 16);

  43.     this->key2=usercache.mid(5,1).toHex().toUInt(&ok, 16);

  44.     this->gotpowerup1=usercache.mid(6,1).toHex().toUInt(&ok, 16);

  45.     this->gotpowerup2=usercache.mid(7,1).toHex().toUInt(&ok, 16);

  46.     this->yoffset=usercache.mid(8,1).toHex().toUInt(&ok, 16);

  47.     this->xoffset=usercache.mid(9,1).toHex().toUInt(&ok, 16);

  48.     this->pos=usercache.mid(10,2).toHex().toUShort(&ok, 16);

  49.     this->score=usercache.mid(12,8).toHex().toULongLong(&ok, 16);

  50.     this->adminkey=usercache.mid(20,8).toHex().toULongLong(&ok, 16);

  51.     this->playerid=usercache.mid(28,8).toHex().toULongLong(&ok, 16);

  52.     this->achievements=usercache.mid(36,8).toHex().toULongLong(&ok, 16);

  53.     this->flags=usercache.mid(44,8).toHex().toULongLong(&ok, 16);

  54. }
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is anything wrong with this code?