QT 获取文件属性

参考教材实例，增加了注释和新功能，方便大家交流学习

 //fileinformation.cpp

include "fileinformation.h"

#

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

    : QDialog( parent, f )

{  

    setWindowTitle(tr("File Information"));

    LabelFileName = new QLabel();

    LabelFileName->setText(tr("File Name:"));

    LineEditFileName = new QLineEdit();   

    PushButtonFile = new QPushButton( this);

    PushButtonFile->setText( tr( "File" ) );

    LabelSize = new QLabel();

    LabelSize->setText(tr("Size:"));

    LineEditSize = new QLineEdit();  

    LabelCreated = new QLabel();

    LabelCreated->setText(tr("Created:"));

    LineEditCreated = new QLineEdit();

    LabelLastModified = new QLabel();

    LabelLastModified->setText(tr("Last Modified:"));

    LineEditLastModified = new QLineEdit();

    LabelLastRead = new QLabel();

    LabelLastRead->setText(tr("Last Read:"));

    LineEditLastRead = new QLineEdit();        

    LabelProperty = new QLabel();

    LabelProperty->setText(tr("Property:"));

    CheckBoxIsDir = new QCheckBox();

    CheckBoxIsDir->setText(tr("Dir"));

    CheckBoxIsFile = new QCheckBox();

    CheckBoxIsFile->setText(tr("File"));

    CheckBoxIsSymLink = new QCheckBox();

    CheckBoxIsSymLink->setText(tr("SymLink"));

    CheckBoxIsHidden = new QCheckBox();

    CheckBoxIsHidden->setText(tr("Hidden"));

    CheckBoxIsReadable = new QCheckBox();

    CheckBoxIsReadable->setText(tr("Readable"));

    CheckBoxIsWritable = new QCheckBox();

    CheckBoxIsWritable->setText(tr("Writable"));

    CheckBoxIsExecutable = new QCheckBox();

    CheckBoxIsExecutable->setText(tr("Executable"));

    PushButtonGet = new QPushButton( this);

    PushButtonGet->setText( tr("Get" ));

    QHBoxLayout *hbLayout1 = new QHBoxLayout ();

    hbLayout1->addWidget(LabelFileName);

    hbLayout1->addWidget(LineEditFileName);

    hbLayout1->addWidget(PushButtonFile);

    QHBoxLayout *hbLayout2 = new QHBoxLayout ();

    hbLayout2->addWidget(LabelSize);

    hbLayout2->addWidget(LineEditSize);

    QHBoxLayout *hbLayout3 = new QHBoxLayout();

    hbLayout3->addWidget(LabelCreated);

    hbLayout3->addWidget(LineEditCreated);

    QHBoxLayout *hbLayout4 = new QHBoxLayout();

    hbLayout4->addWidget(LabelLastModified);

    hbLayout4->addWidget(LineEditLastModified);

    QHBoxLayout *hbLayout5 = new QHBoxLayout();

    hbLayout5->addWidget(LabelLastRead);

    hbLayout5->addWidget(LineEditLastRead);

    QHBoxLayout *hbLayout6 = new QHBoxLayout();

    hbLayout6->addWidget(LabelProperty);

    hbLayout6->addStretch();            

    QHBoxLayout *hbLayout7 = new QHBoxLayout();

    hbLayout7->addWidget(CheckBoxIsDir);

    hbLayout7->addWidget(CheckBoxIsFile);

    hbLayout7->addWidget(CheckBoxIsSymLink);

    hbLayout7->addWidget(CheckBoxIsHidden);

    hbLayout7->addWidget(CheckBoxIsReadable);

    hbLayout7->addWidget(CheckBoxIsWritable);

    hbLayout7->addWidget(CheckBoxIsExecutable);

    QVBoxLayout *vbLayout = new QVBoxLayout( this );

    vbLayout->addLayout( hbLayout1 );

    vbLayout->addLayout( hbLayout2 );

    vbLayout->addLayout( hbLayout3 );

    vbLayout->addLayout( hbLayout4 );

    vbLayout->addLayout( hbLayout5 );

    vbLayout->addLayout( hbLayout6 );

    vbLayout->addLayout( hbLayout7 );

    vbLayout->addWidget( PushButtonGet );

    connect(PushButtonFile,SIGNAL(clicked()),this,SLOT(slotFile()));

    connect(PushButtonGet,SIGNAL(clicked()),this,SLOT(slotGet()));

}

FileInformation::~FileInformation()

{

}

void FileInformation::slotFile()

{

    QString s = QFileDialog::getOpenFileName(   //获取文件路径

this, "open file dialog",

        "/",

        "files (*)");            

    LineEditFileName->setText( s.toAscii().data());//文件路径

}

void FileInformation::slotGet()

{

    QFileInfo info(LineEditFileName->text());

    //获取文件大小

    //在不同的平台上，基本的C++类型如short，char，int，long，long long会有不同的字长。

    //最好把它们转换为qint8，quint8，qint16，quint16，qint32，

    //quint32，qint64，quint64，这些类型能确保字长是不随平台改变的。

    qint64 size = info.size();

    //读取文件时间信息

    QDateTime created = info.created();

    QDateTime lastModified = info.lastModified();

    QDateTime lastRead = info.lastRead();

    //读取文件属性

    bool isDir = info.isDir();

    bool isFile = info.isFile();

    bool isSymLink = info.isSymLink();

    bool isHidden = info.isHidden();

    bool isReadable = info.isReadable();

    bool isWritable = info.isWritable();

    bool isExecutable =info.isExecutable();

    LineEditSize->setText (QString::number(size));

    //显示文件时间信息

    LineEditCreated->setText (created.toString());

    LineEditLastModified->setText (lastModified.toString());

    LineEditLastRead->setText (lastRead.toString());

    //显示文件属性

    CheckBoxIsDir->setCheckState (isDir?Qt::Checked:Qt::Unchecked);

    CheckBoxIsFile->setCheckState (isFile?Qt::Checked:Qt::Unchecked);

    CheckBoxIsSymLink->setCheckState (isSymLink?Qt::Checked:Qt::Unchecked);

    CheckBoxIsHidden->setCheckState (isHidden?Qt::Checked:Qt::Unchecked);

    CheckBoxIsReadable->setCheckState (isReadable?Qt::Checked:Qt::Unchecked);

    CheckBoxIsWritable->setCheckState (isWritable?Qt::Checked:Qt::Unchecked);

    CheckBoxIsExecutable->setCheckState (isExecutable?Qt::Checked:Qt::Unchecked);

}

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//fileinformation.h

 

#ifndef FILEINFORMATION_H

#define FILEINFORMATION_H

#include <QtGui>

class FileInformation : public QDialog

{

    Q_OBJECT

public:

    FileInformation( QWidget *parent=0, Qt::WindowFlags  f=0 );

    ~FileInformation();

public:

QLabel* LabelFileName;

QLineEdit* LineEditFileName;

QPushButton* PushButtonFile;

QLabel* LabelSize;

QLineEdit* LineEditSize;

QLabel* LabelCreated;

QLineEdit* LineEditCreated;

QLabel* LabelLastModified ;

QLineEdit* LineEditLastModified;

QLabel* LabelLastRead ;

QLineEdit* LineEditLastRead;

QLabel* LabelProperty ;

QCheckBox* CheckBoxIsDir;

QCheckBox* CheckBoxIsFile;

QCheckBox* CheckBoxIsSymLink;

QCheckBox* CheckBoxIsHidden;

QCheckBox* CheckBoxIsReadable;

QCheckBox* CheckBoxIsWritable;

QCheckBox* CheckBoxIsExecutable;

        QPushButton* PushButtonGet;

public slots:

void slotFile();

        void slotGet();

};

#endif

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

//main.cpp

#include "fileinformation.h"

#include <QApplication>

int main( int argc, char **argv )

{

    QFont font("ZYSong18030",12);

    QApplication::setFont(font);

    QApplication a( argc, argv ); 

    FileInformation fileinformation;

    fileinformation.show();

    return a.exec();

}

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//fileinformation.pro

 

TEMPLATE= app

TARGET= fileinformation

HEADERS= fileinformation.h

SOURCES= fileinformation.cpp /

  main.cpp

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