QFileInfo Creation

[QbelcorT]

Hi,
I know QFileInfo can get the creation date of a file. Is there an effiecient method in for finding the oldest file in a directory using Qt functions?. The directory will have a maximum of 125 files in it. I know in linux I can use this ls -lat | grep ^- | tail -1 | head -1. but I prefer not using this method.
I need the speed to be fast. Any suggestions?
Thank you.

[spirit]

I think this QDir::entryInfoList should help you.

[spirit]

an example

...
QDir dir("d:/");
QStringList entities = dir.entryList(QDir::Files, QDir::Time);
qDebug() << entities;
...

...
QDir dir("d:/");
QStringList entities = dir.entryList(QDir::Files, QDir::Time);
qDebug() << entities;
...

To copy to clipboard, switch view to plain text mode 

a last file is oldest.

[shentian]

Not quite, QDir::Time sorts by modification date, not creation date. You will have to read all QFileInfo's and do the comparison yourself:

QDir dir("d:/");
  QFileInfo oldest;
  foreach (QFileInfo fileInfo, dir.entryInfoList())
  {
    if (oldest.filePath().isEmpty() || fileInfo.created() < oldest.created())
    {
      oldest = fileInfo;
    }
  }
  qDebug() << "Oldest file is: " << oldest.filePath();

QDir dir("d:/");
  QFileInfo oldest;
  foreach (QFileInfo fileInfo, dir.entryInfoList())
  {
    if (oldest.filePath().isEmpty() || fileInfo.created() < oldest.created())
    {
      oldest = fileInfo;
    }
  }
  qDebug() << "Oldest file is: " << oldest.filePath();

To copy to clipboard, switch view to plain text mode