「深度学习福利」大神带你进阶工程师，立即查看>>> #include "watcher.h" #include <QVBoxLayout> #include <QDir> #include <QMessageBox> #include <QApplication> Watcher::Watcher(QWidget *parent) : QWidget(parent) { QStringList args=qApp->arguments(); QString path; //读取命令行指定的目录作为监听目录。 if(args.count()>1) { path=args[1]; } else //获取没有指定，监听当前目录 { path=QDir::currentPath(); } pathLabel = new QLabel; pathLabel->setText(tr("监视的目录：")+path); QVBoxLayout *mainLayout = new QVBoxLayout(this); mainLayout->addWidget(pathLabel); fsWatcher.addPath(path); connect(&fsWatcher,SIGNAL(directoryChanged(QString)),this,SLOT(directoryChanged(QString))); } Watcher::~Watcher() { } void Watcher::directoryChanged(QString path) { QMessageBox::information(NULL,tr("目录发生变化"),path); }