QFileSystemWatcher的使用

• 程序
• 效果展示

程序

.h
#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QLabel>
#include <QFileSystemWatcher>

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();
public slots:
    void directroyChanged(QString path);
private:
    QLabel *pathLabel;
    QFileSystemWatcher fsWatcher;
};

#endif // WIDGET_H

.cpp
#include "widget.h"
#include <QVBoxLayout>
#include <QDir>
#include <QMessageBox>
#include <QApplication>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    QStringList args=qApp->arguments();
    QString path;
    if(args.count()>1)
    {
        path=args[1];
    }
    else
    {
        path=QDir::currentPath();
    }
    pathLabel=new QLabel;
    pathLabel->setText("监视的目录"+path);
    QVBoxLayout*mainLayout=new QVBoxLayout(this);
    mainLayout->addWidget(pathLabel);
    fsWatcher.addPath(path);
    connect(&fsWatcher,SIGNAL(directoryChanged(QString)),this,SLOT(directroyChanged(QString)));
}

Widget::~Widget()
{

}

void Widget::directroyChanged(QString path)
{
    QMessageBox::information(NULL,"目录发生变化",path);
}

效果展示