void ShredDialog::onSelectButtonClicked()
{
//    QString fileName=QFileDialog::getOpenFileName(0, tr("Select file"), QDir::homePath(), tr("All Files(*)"));

    QStringList fileNameList;
    QString fileName;
    QFileDialog* fd = new QFileDialog(this);
    fd->resize(500, 471);
    fd->setFilter(tr("Allfile(*)"));
//    fd->setFilter( "Allfile(*.*);;mp3file(*.mp3);;wmafile(*.wma);;wavefile(*.wav)");
    fd->setViewMode(QFileDialog::List);//设置浏览模式,有 列表(list) 模式和 详细信息(detail)两种方式
    if (fd->exec() == QDialog::Accepted)
    {
        fileNameList = fd->selectedFiles();
        fileName = fileNameList[0];
        select_edit->setText(fileName);
    }
    else
        fd->close();
}