qint64 du(const QString &path)

{

    QDir dir(path);

    qint64 size = 0;

    foreach(QFileInfo fileInfo,dir.entryInfoList(QDir::Files))

    {

        size += fileInfo.size();

    }

    foreach(QString subDir,dir.entryList(QDir::Dirs|QDir::NoDotAndDotDot))

    {

        size += du(path+QDir::separator()+subDir);

    }

    char unit ='B';

    qint64 curSize=size;

    if(curSize>1024)

    {

        curSize/=1024;

        unit ='K';

        if(curSize>1024)

        {

            curSize/=1024;

            unit ='M';

            if(curSize>1024)

            {

                curSize/=1024;

                unit ='G';

            }

        }

    }

    qDebug()<<curSize<<unit<<"	"<<qPrintable(path)<<endl;

    return size;

}

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    QStringList args = a.arguments();

    QString path;

    if(args.count()>1)

    {

        path = args[1];

    }

    else

    {

        path = QDir::currentPath();

    }

    qDebug()<<path<<endl;

    du(path);

    return a.exec();

}

foreach(QFileInfo fileInfo,dir.entryInfoList(QDir::Files))

--------------

FileView::FileView(QWidget *parent,Qt::WindowFlags f)

    : QDialog(parent,f)

{

    setWindowTitle(tr("File View"));

    fileLineEdit = new QLineEdit(tr("/"));

    fileListWidget = new QListWidget;

    mainLayout = new QVBoxLayout(this);

    mainLayout->addWidget(fileLineEdit);

    mainLayout->addWidget(fileListWidget);

    connect(fileLineEdit,SIGNAL(returnPressed()),this,SLOT(slotShow(QDir)));

    connect(fileListWidget,SIGNAL(itemDoubleClicked(QListWidgetItem*)),this,SLOT(slotDirShow(QListWidgetItem*)));

    QString root = "/";

    QDir rootDir(root);

    QStringList string;

    string << "*";

    QFileInfoList list=rootDir.entryInfoList(string);

    showFileInfoList(list);

}

FileView::~FileView()

{

}

void FileView::slotShow(QDir dir)

{

    QStringList string;

    string<<"*";

    QFileInfoList list=dir.entryInfoList(string,QDir::AllEntries,QDir::DirsFirst);

    showFileInfoList(list);

}

void FileView::showFileInfoList(QFileInfoList list)

{

    fileListWidget->clear();

    for(unsigned int i=0;i<list.count();i++)

    {

        QFileInfo tmpFileInfo=list.at(i);

        if(tmpFileInfo.isDir())

        {

            QIcon icon("dir.png");

            QString fileName = tmpFileInfo.fileName();

            QListWidgetItem *tmp = new QListWidgetItem(icon,fileName);

            fileListWidget->addItem(tmp);

        }

        else if(tmpFileInfo.isFile())

        {

            QIcon icon("file.png");

            QString fileName=tmpFileInfo.fileName();

            QListWidgetItem *tmp = new QListWidgetItem(icon,fileName);

            fileListWidget->addItem(tmp);

        }

    }

}

void FileView::slotDirShow(QListWidgetItem * item)

{

    QString str=item->text();

    QDir dir;

    dir.setPath(fileLineEdit->text());

    dir.cd(str);

    fileLineEdit->setText(dir.absolutePath());

    slotShow(dir);

}

    dir.setPath(fileLineEdit->text());

    dir.cd(str);

dir.absolutePath()

QFileInfoList list=dir.entryInfoList(string,QDir::AllEntries,QDir::DirsFirst);