Qt中的QFileDialog类的几个示范代码

void Dialog::setExistingDirectory()
{  //选择一个文件夹;
    QFileDialog::Options options = QFileDialog::DontResolveSymlinks | QFileDialog::ShowDirsOnly;
    if (!native->isChecked())
        options |= QFileDialog::DontUseNativeDialog;
    QString directory = QFileDialog::getExistingDirectory(this,
                                tr("QFileDialog::getExistingDirectory()"),
                                directoryLabel->text(),
                                options);
    if (!directory.isEmpty())
        directoryLabel->setText(directory);
}

void Dialog::setOpenFileName()
{  //打开一个文件;
    QFileDialog::Options options;
    if (!native->isChecked())
        options |= QFileDialog::DontUseNativeDialog;
    QString selectedFilter;
    QString fileName = QFileDialog::getOpenFileName(this,
                                tr("QFileDialog::getOpenFileName()"),
                                openFileNameLabel->text(),
                                tr("All Files (*);;Text Files (*.txt)"),
                                &selectedFilter,
                                options);
    if (!fileName.isEmpty())
        openFileNameLabel->setText(fileName);
}

void Dialog::setOpenFileNames()
{  //打开多个文件;
    QFileDialog::Options options;
    if (!native->isChecked())
        options |= QFileDialog::DontUseNativeDialog;
    QString selectedFilter;
    QStringList files = QFileDialog::getOpenFileNames(
                                this, tr("QFileDialog::getOpenFileNames()"),
                                openFilesPath,
                                tr("All Files (*);;Text Files (*.txt)"),
                                &selectedFilter,
                                options);
    if (files.count()) {
        openFilesPath = files[0];
        openFileNamesLabel->setText(QString("[%1]").arg(files.join(", ")));
    }
}

void Dialog::setSaveFileName()
{  //保存一个文件;
    QFileDialog::Options options;
    if (!native->isChecked())
        options |= QFileDialog::DontUseNativeDialog;
    QString selectedFilter;
    QString fileName = QFileDialog::getSaveFileName(this,
                                tr("QFileDialog::getSaveFileName()"),
                                saveFileNameLabel->text(),
                                tr("All Files (*);;Text Files (*.txt)"),
                                &selectedFilter,
                                options);
    if (!fileName.isEmpty())
        saveFileNameLabel->setText(fileName);
}