Qt 打开保存文件对话框

函数：

    static QString getSaveFileName(QWidget *parent = 0,                                   const QString &caption = QString(),                                   const QString &dir = QString(),                                   const QString &filter = QString(),                                   QString *selectedFilter = 0,                                   Options options = 0);

示例：

bool MainWindow::saveAs(){    QString fileName = QFileDialog::getSaveFileName(this,                               tr("Save Spreadsheet"), ".",                               tr("Spreadsheet files (*.sp)"));    if (fileName.isEmpty())        return false;    return saveFile(fileName);}