Qt get all files in a folder

Record a common function here, get the files under the folder, or the operation of the folder.And output the directory on the combox control:

The functions of the following two functions are to get the subfolder under the specified folder and get the specified file under the specified folder.Note that files of the specified type can be obtained through setNameFilters.

//Dirs listint QtGuiApplication::getDirs(const QString& dirName){QDir* dirinfo = new QDir(dirName);if (!dirinfo->exists()) {delete dirinfo, dirinfo = nullptr;return -1;}QStringList dirList = dirinfo->entryList(QDir::Dirs);dirList.removeOne(".");dirList.removeOne("..");ui.comboBox->clear();ui.comboBox->addItems(dirList);delete dirinfo, dirinfo = nullptr;return 0;}//Files listint QtGuiApplication::getFiles(const QString& dirName){QDir* dirinfo = new QDir(dirName);if (!dirinfo->exists()) {delete dirinfo, dirinfo = nullptr;return -1;}dirinfo->setNameFilters(QStringList("*.png"));QStringList fileList = dirinfo->entryList(QDir::Files);fileList.removeOne(".");fileList.removeOne("..");ui.comboBox_2->clear();ui.comboBox_2->addItems(fileList);delete dirinfo, dirinfo = nullptr;return 0;}

The results are as follows: