Below given is my part of code that used to work some (long) time back. When I need this code, I find it works no more. The compilation is clean, bur when run gives the error as:

[lx@localhost listDir]$ ./listDir /home/lux/Downloads/xfrd/raw /home/lx/Downloads/xfrd/rawConv/
04. qStrDir: /home/lx/Downloads/xfrd/raw, qFileInfoDirInfo->fileName: raw01
05. Before QFileInfoListIterator filesIterator( *filesList ): 0
Segmentation fault (core dumped)

The problem seems to be inconsistency by way of new version of the Qt. Please help to make this code work.

Qt Code: 
  1. QDir qDirFindLargest, qDirLargestFile, qDirFilesChange;
  2.     QFile qf;
  3.     QString qStrDir, qStrDir2, qStrTemp;       // a.argv()[i] == argv[i]
  4.     qStrTemp = a.argv()[0];
  5.     qStrDir = a.argv()[1];
  6.     qStrDir2 = a.argv()[2];
  7.     //cout << "Total agrc: " << argc  << ", Directories 0: " << qStrTemp << ", 1: " << qStrDir << ", 2: " << qStrDir2 << endl;
  8.  
  9.     qDirFindLargest.setPath ( qStrDir );
  10.     qDirFindLargest.setFilter( QDir::Dirs ); // sets only the directory: shows the directories only
  11.     qDirFindLargest.setSorting( QDir::Name | QDir::Reversed ); 
  12.  
  13.     const QFileInfoList *qFileInfoDirList = qDirFindLargest.entryInfoList();
  14.     QFileInfoListIterator qFileInfoListIteratorDir( *qFileInfoDirList );
  15.     QFileInfo *qFileInfoDirInfo;
  16.  
  17.     QString qFileName;
  18.     int fileNumber = 0;
  19.  
  20.     while ( ( qFileInfoDirInfo = qFileInfoListIteratorDir.current() ) != 0 ) {
  21.     if (qFileInfoDirInfo->fileName() == "." ) { // first item in the directory: . (let pass)
  22.         ++qFileInfoListIteratorDir;
  23.     }
  24.     else if (qFileInfoDirInfo->fileName() == ".." ) { // first item in the directory: .. (let pass)
  25.         ++qFileInfoListIteratorDir;
  26.     }
  27.     else {
  28.         qDirLargestFile.setPath ( qStrDir + qFileInfoDirInfo->fileName() );
  29.         qDirLargestFile.setFilter( QDir::Files ); // qFiles to only show the files
  30.         qDirLargestFile.setSorting( QDir::Name | QDir::Reversed ); // sorting the files in the directory in reverse order: to find the last file alphabetically
  31.           cout << "04. qStrDir: " << qStrDir << ", qFileInfoDirInfo->fileName: " << qFileInfoDirInfo->fileName() << endl;
  32.         const QFileInfoList *filesList = qDirLargestFile.entryInfoList();
  33.           cout << "05. Before QFileInfoListIterator filesIterator( *filesList );" << endl;
  34.  
  35.         QFileInfoListIterator filesIterator( *filesList );
  36.           cout << "06. After QFileInfoListIterator filesIterator( *filesList );" << endl;
  37.         QFileInfo *files;
  38.           cout << "07. After QFileInfo *files;" << endl;
  39.         files = filesIterator.current();
  40.           cout << "07A. After files = filesIterator.current(), files = filesIterator.current(): " << filesIterator.current() << endl;
  41.           cout << "08. After files = filesIterator.current(), files->fileName: " << files->fileName() << endl;
  42.  
  43. ... }
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