QDir示例

#include <QCoreApplication>
#include <QDir>
#include <QFileInfo>
#include <QDebug>
#include <QString>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    qDebug() << "the directory of application's executable" << QCoreApplication::applicationDirPath() << endl;

    QDir dir("D:/env/aaa");
    if (!dir.exists())
    {
        qWarning("Cannot find the D:/env directory");
    } else {
        qDebug() << "D/env exists" << endl;
    }

    QDir mDir;

    foreach(QFileInfo mFileInfoItem, mDir.drives())
    {
        qDebug() << mFileInfoItem.absoluteFilePath() << endl;
    }

    QDir myDir;
    QString mPath = "E:/Test/ZZZ";

    if (!myDir.exists(mPath))
    {
        myDir.mkpath(mPath);
        qDebug () << mPath << " Created!" << endl;
    }
    else {
        qDebug() << mPath << " Already exists" << endl;
    }

    QDir dDir("E:/SoftDevelop/CPlus/QtProjects/Qt5Samples/MyQtDemos");

    foreach(QFileInfo mItem, dDir.entryInfoList())
    {
        if (mItem.isDir())
        {
            qDebug() << "Dir: " << mItem.absoluteFilePath() << endl;
        }
        if (mItem.isFile())
        {
            qDebug() << "File: " << mItem.absoluteFilePath() << endl;
        }
    }

    return a.exec();
}

// A program that lists all the files in the current directory (excluding symbolic links), sorted by size, smallest first:

  #include <QDir>
  #include <iostream>

  int main(int argc, char *argv[])
  {
      QCoreApplication app(argc, argv);
      QDir dir;
      dir.setFilter(QDir::Files | QDir::Hidden | QDir::NoSymLinks);
      dir.setSorting(QDir::Size | QDir::Reversed);

      QFileInfoList list = dir.entryInfoList();
      std::cout << "     Bytes Filename" << std::endl;
      for (int i = 0; i < list.size(); ++i) {
          QFileInfo fileInfo = list.at(i);
          std::cout << qPrintable(QString("%1 %2").arg(fileInfo.size(), 10)
                                                  .arg(fileInfo.fileName()));
          std::cout << std::endl;
      }
      return 0;
  }