問(wèn)題描述

我是 QT 新手，我想使用 QFileSystemWatcher 來(lái)監(jiān)視文件夾.我就是不知道該怎么做.

I'm new with QT and I want to use the QFileSystemWatcher to monitor a folder. I just can't figure how to do that.

我閱讀了http://qt-project.org/doc/qt-4.8/qfilesystemwatcher.html 但我什至不知道如何初始化它.

I read http://qt-project.org/doc/qt-4.8/qfilesystemwatcher.html but I don't know how to even initialize it.

我還沒(méi)有找到一個(gè)例子，所以現(xiàn)在，如果有人可以發(fā)布一個(gè)解釋或一個(gè)簡(jiǎn)單的例子來(lái)監(jiān)視一個(gè)文件夾，僅此而已.

I haven't found a single example, so now, I please if somebody could post an explanation or a simple example that monitors a folder and nothing more.

哦，如果重要的話，這應(yīng)該在控制臺(tái)中運(yùn)行.

Oh, and this is supposed to run in console if it matters.

感謝您的回答和問(wèn)候.

推薦答案

請(qǐng)看一下這個(gè) .h 和 .cpp ，它顯示了示例...干杯！

Please have a look at this .h and .cpp , it shows the example... cheers !

#ifndef MYCLASS_H
#define MYCLASS_H

#include <QWidget>
#include <QMessageBox>

class MyClass : public QWidget
{
    Q_OBJECT

public:
    MyClass(QWidget* parent=0)
        :QWidget(parent){}

    ~MyClass(){}

public slots:
    void showModified(const QString& str)
    {
        Q_UNUSED(str)
        QMessageBox::information(this,"Directory Modified", "Your Directory is modified");
    }
};

#endif // MYCLASS_H



#include <QApplication>
#include <QFileSystemWatcher>
#include <QDebug>

#include "MyClass.h"

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    QFileSystemWatcher watcher;
    watcher.addPath("C:/QtTest");

    QStringList directoryList = watcher.directories();
    Q_FOREACH(QString directory, directoryList)
            qDebug() << "Directory name" << directory <<"
";

    MyClass* mc = new MyClass;

    QObject::connect(&watcher, SIGNAL(directoryChanged(QString)), mc, SLOT(showModified(QString)));

    return app.exec();
}

當(dāng)您在C:/QtTest"路徑中修改、創(chuàng)建或刪除文件或文件夾時(shí)，您將收到一個(gè)消息框.

When ever you modify, or create or delete a file or folder within "C:/QtTest" path you will get a message box.

這篇關(guān)于如何使用 QFileSystemWatcher 監(jiān)視文件夾的更改的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！