【Qt】QDir

【目的】

1. 使用 Qdir 列出所在所在目錄下的檔案。
2. 搭配QTreeWidget列出所在目錄下的檔案。

【基本方式】

• 程式

  #include <QtGui/QApplication>
  #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;
  }

• 結果
  

【搭配QTree】

• 程式

  #include <QApplication>
  #include <QTreeWidget>
  #include <QTreeWidgetItem>
  #include <QStringList>
  #include <QFile>
  #include <QFileInfo>
  #include <QDir>
  
  int main(int argc, char *argv[])
  {
    QApplication app(argc, argv);
  
    QTreeWidget *treeWidget = new QTreeWidget;
    treeWidget->setWindowTitle("QTreeWidget & Item");
    treeWidget->resize(400, 250);
    QStringList columnTitle;
    columnTitle.append("Name");
    treeWidget->setHeaderLabels(columnTitle);
    QFileInfo fileInfo(QCoreApplication::applicationDirPath());
    QStringList fileColumn;
    fileColumn.append(fileInfo.fileName());
    QTreeWidgetItem *dir = new QTreeWidgetItem(fileColumn);
    treeWidget->addTopLevelItem(dir);
    listFile(dir, fileInfo);
    treeWidget->show();
    return app.exec();
  }
  
  void listFile(QTreeWidgetItem *parentWidgetItem, QFileInfo &parent)
  {
    QDir dir;
    dir.setPath(parent.filePath());
    dir.setFilter(QDir::Files | QDir::Dirs | QDir::NoSymLinks);
    dir.setSorting(QDir::DirsFirst | QDir::Name);
    const QFileInfoList fileList = dir.entryInfoList();
    for (int i = 0; i < fileList.size(); i++) 
    {
      QFileInfo fileInfo = fileList.at(i);
      QStringList fileColumn;
      fileColumn.append(fileInfo.fileName());
      if (fileInfo.fileName() == "." || fileInfo.fileName() == ".." );
      else if(fileInfo.isDir()) 
      {
        QTreeWidgetItem *child = new QTreeWidgetItem(fileColumn);
        parentWidgetItem->addChild(child);
        listFile(child, fileInfo);
      }
      else
      {
        QTreeWidgetItem *child = new QTreeWidgetItem(fileColumn);
        parentWidgetItem->addChild(child);
      }
    }
  }

• 結果

  

【參考】

• Qt4 Gossip: QTreeWidget 與 QTreeWidgetItem
  http://caterpillar.onlyfun.net/Gossip/Qt4Gossip/QTreeWidgetQTreeWidgetItem.html
• QDir Class Reference
  http://doc.qt.nokia.com/4.6/qdir.html