here is my code:

Qt Code: 
  1. QSharedMemory numofallplayers;
  2.  
  3. void sesman::run()
  4. {
  5.     numofallplayers.setKey("numofallplayers");
  6.     numofallplayers.create(sizeof(qint64), QSharedMemory::ReadWrite);
  7.  
  8.     qDebug() << "session manager thread starts from" << QThread::currentThread();
  9.     qDebug() << "seting total players to zero";
  10.     sesman::SetNumOfAllPlayers(0);
  11.     qDebug() << "num of players total: " << sesman::GetNumOfAllPlayers();  //just to check
  12. .
  13. .
  14. .
  15.     cleanup();
  16. }
  17.  
  18.  
  19. void sesman::SetNumOfAllPlayers(qint64 totalplayers)
  20. {
  21.     if(numofallplayers.isAttached()){
  22.         numofallplayers.detach();
  23.     }
  24.     if(!numofallplayers.attach(QSharedMemory::ReadWrite)){
  25.         //some error
  26.         qDebug() << "attach numofallplayers failed" << numofallplayers.errorString();
  27.     }
  28.     numofallplayers.lock();
  29.     qint64* totalpl = (qint64*)numofallplayers.data();
  30.     *totalpl = totalplayers;
  31.     numofallplayers.unlock();
  32.     if(!numofallplayers.detach())
  33.         qDebug() << "unable to detach";
  34. }
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and i get following error

seting total players to zero
attach numofallplayers failed "QSharedMemory::handle:: UNIX key file doesn't exist"
The program has unexpectedly finished.

Can someone help? what is wrong with my code?

thanks a lot for any help...