用QFileDialog打开对话框读取文件以后，当我再次打开对话框，如何能保持上次打开的路径？ [复制链接]

用QFileDialog打开对话框读取文件以后，当我再次打开对话框，如何能保持上次打开的路径？

// just define fileName as a member variable    

void getFileNameSlot()
{
       QString newFileName = QFileDialog::getOpenFileName(this, tr("Open  File"),            
                                                                                                              fileName, tr("XML files (*.xml)"));

       if ( newFileName.isEmpty() )
        return;
      else if ( analysisDescriptorFileName.isEmpty() )
        fileName= newFileName;
}