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我在QMainWindow类下使用了getSaveFileName，它的父类怎么写

我在QMainWindow类下使用了QFileDialog::getSaveFileName，
QString QFileDialog::getSaveFileName(
QWidget * parent = 0,
const QString & caption = QString(),
const QString & dir = QString(),
const QString & filter = QString(),
QString * selectedFilter = 0,
Options options = 0
)
QWidget * parent = 0, 在getSaveFileName怎么填


error: no matching function for call to 'QFileDialog::getSaveFileName(
MainWindow*, QString,
QStringList, QString)'
QStandardPaths::standardLocations(QStandardPaths::MoviesLocation),
tr("Videos files(*.mp4 *.flv *.rm)")
);
^
这是错误的提示


error: no matching function for call to 'QFileDialog::getOpenFileName(
MainWindow*, QString, QStringList, QString)'
QStandardPaths::standardLocations(QStandardPaths::MoviesLocation),
tr("Videos files(*.mp4 *.flv *.rm)")
);
^


void MainWindow::setDestination()
{
QString file = QFileDialog::getSaveFileName (
this,
tr("Select Destination"),
QStandardPaths::standardLocations(QStandardPaths::MoviesLocation),
tr("Videos files(*.mp4 *.flv *.rm)"));
ui->lineEdit_2->setText(file);
}


求大神指点下


路过


谁调的它谁就是它的parent


QString file = QFileDialog::getOpenFileName((QWidget*)this, tr("Select Source File"), "D:",tr("Videos files(*.mp4 *.flv *.rm)"));
使用(QWidget*)this强制转换解决了


QStandardPaths::standardLocations(QStandardPaths::MoviesLocation),返回是QStringList
换成
QStandardPaths::writableLocation(QStandardPaths::DesktopLocation)


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