Hi I've noticed a very strange problem a use QFileSystemWatcher to monitor one folder, when new files are copied to this folder the signal directoryChanged is emitted. I wrote a slot, which works well, it gives me the confidence that when ALL files are copied to the folder only then the right action is taken:

Qt Code: 
  1. void DServer::newFiles_()
  2. {
  3.     QDir input(QDir::homePath() + "/INPUT DICOM");
  4.  
  5.     if(input.count() > lastInput)
  6.     {
  7.         QTextStream(stdout)<<"not all files" << lastInput <<endl;
  8.         lastInput = input.count();
  9.         return;
  10.     }
  11.     else
  12.     {
  13.         QDir inputDir(QDir::homePath() + "/INPUT DICOM");
  14.         QTextStream(stdout) << "BEFORE IF   "<<inputDir.count() <<endl;
  15.         if(inputDir.count() > 1)
  16.         {
  17.             QTextStream(stdout)<<"Got all files"<< lastInput <<endl;
  18.             inputFiles = getPaths(QDir::homePath() + "/INPUT DICOM");
  19.             emit this->_moveFiless();
  20.             lastPatientName.clear();
  21.             lastInput = 1;
  22.         }
  23.         else
  24.             return;
  25.     }
  26. }
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However this slot
Qt Code: 
  1. void DServer::moveFiless_()
  2. {
  3.     QString input("/INPUT DICOM");
  4.     QDate date = QDate::currentDate();
  5.     QTime time = QTime::currentTime();
  6.  
  7.     for(int i=0; i<inputFiles.count(); i++)
  8.     {
  9.         QString old_input_list = inputFiles[i];
  10.         inputFiles[i].remove(0,(QDir::homePath().count()) + input.count());
  11.  
  12.         int length = inputFiles[i].length();
  13.         int startindex = inputFiles[i].lastIndexOf("/",-1) + 1;
  14.         QString dir_path = inputFiles[i];
  15.  
  16.         dir_path.remove(startindex, length);
  17.  
  18.         QDir dir;
  19.         if(dir.mkpath(QDir::homePath() + "/DICOM STORAGE/" + date.toString("dd.MM.yyyy") + "/" + time.toString("hh:mm:ss") + dir_path) == true)
  20.         {
  21.             //anonymize here
  22.             anonymous("/" + date.toString("dd.MM.yyyy") + "/"  + time.toString("hh:mm:ss") + inputFiles[i], old_input_list);
  23.             dir.mkpath(QDir::homePath() + "/TEMPORARY STORAGE/" + date.toString("dd.MM.yyyy") + "/" + time.toString("hh:mm:ss") + dir_path);
  24. date.toString("dd.MM.yyyy") + "/"  + time.toString("hh:mm:ss") + input_list[i] + ".tmp");
  25.  
  26.             QFile::copy(old_input_list, (QDir::homePath() + "/TEMPORARY STORAGE/" + date.toString("dd.MM.yyyy") + "/"  + time.toString("hh:mm:ss") + inputFiles[i] + ".tmp"));
  27.             QFile::copy(old_input_list, (QDir::homePath() + "/DICOM STORAGE/" + date.toString("dd.MM.yyyy") + "/"  + time.toString("hh:mm:ss") + inputFiles[i]));
  28.             QFile::remove(old_input_list);
  29.             QTextStream(stdout)<<"source file:  "<< old_input_list <<endl;
  30.             dir.rmpath(QDir::homePath() + "/INPUT DICOM" + dir_path);
  31.         }
  32.         else
  33.         {
  34.             QTextStream(stdout) <<"Couldn't make this dir: ' "<< QDir::homePath() + "/DICOM STORAGE" + dir_path <<endl;
  35.         }
  36.     }
  37. }
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doesn't work well, the files from source are copied but they only have from 2.6-3.0 kB, when the original ones have about 80kB, that means the QFile::copy works but not good.