C++ 如何使用 QFileSystemWatcher 监视文件夹的更改
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How to use QFileSystemWatcher to monitor a folder for change
提问by Hami
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.
我是 QT 的新手，我想使用 QFileSystemWatcher 来监视文件夹。我就是不知道该怎么做。
I read http://qt-project.org/doc/qt-4.8/qfilesystemwatcher.htmlbut I don't know how to even initialize it.
我读了http://qt-project.org/doc/qt-4.8/qfilesystemwatcher.html但我什至不知道如何初始化它。
I 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.
我还没有找到一个例子，所以现在，如果有人可以发布一个解释或一个简单的例子来监视一个文件夹，仅此而已。
Oh, and this is supposed to run in console if it matters.
哦，如果重要的话，这应该在控制台中运行。
Thx for your answers and regards.
感谢您的回答和问候。
回答by Soumya Kundu
Please have a look at this .h and .cpp , it shows the example... cheers !
请看看这个 .h 和 .cpp ，它显示了示例......干杯！
#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 <<"\n";
MyClass* mc = new MyClass;
QObject::connect(&watcher, SIGNAL(directoryChanged(QString)), mc, SLOT(showModified(QString)));
return app.exec();
}
When ever you modify, or create or delete a file or folder within "C:/QtTest" path you will get a message box.
当您在“C:/QtTest”路径中修改、创建或删除文件或文件夹时，您将收到一个消息框。
