FileSystemWatcher.h
#ifndef FILESYSTEMWATCHER_H
#define FILESYSTEMWATCHER_H
#include <QObject>
#include <QMap>
#include <QFileSystemWatcher>
class FileSystemWatcher : public QObject
{
Q_OBJECT
public:
//FileSystemWatcher(QObject *parent);
~FileSystemWatcher();
public:
static void addWatchPath(QString path);
public slots:
void directoryUpdated(const QString &path); // 目錄更新時調用,path是監控的路徑
void fileUpdated(const QString &path); // 文件被修改時調用,path是監控的路徑
private:
explicit FileSystemWatcher(QObject *parent = 0);
private:
static FileSystemWatcher *m_pInstance; // 單例
QFileSystemWatcher *m_pSystemWatcher; // QFileSystemWatcher變量
QMap<QString, QStringList> m_currentContentsMap; // 當前每個監控的內容目錄列表
};
#endif // FILESYSTEMWATCHER_H
cpp
#include "filesystemwatcher.h"
#include <QDir>
#include <QFileInfo>
#include <qDebug>
FileSystemWatcher* FileSystemWatcher::m_pInstance = NULL;
FileSystemWatcher::FileSystemWatcher(QObject *parent)
: QObject(parent)
{
}
FileSystemWatcher::~FileSystemWatcher()
{
}
// 監控文件或目錄
void FileSystemWatcher::addWatchPath(QString path)
{
qDebug() << QString("Add to watch: %1").arg(path);
if (m_pInstance == NULL)
{
m_pInstance = new FileSystemWatcher();
m_pInstance->m_pSystemWatcher = new QFileSystemWatcher();
// 連接QFileSystemWatcher的directoryChanged和fileChanged信號到相應的槽
connect(m_pInstance->m_pSystemWatcher, SIGNAL(directoryChanged(QString)), m_pInstance, SLOT(directoryUpdated(QString)));
connect(m_pInstance->m_pSystemWatcher, SIGNAL(fileChanged(QString)), m_pInstance, SLOT(fileUpdated(QString)));
}
// 添加監控路徑
m_pInstance->m_pSystemWatcher->addPath(path);
// 如果添加路徑是一個目錄,保存當前內容列表
QFileInfo file(path);
if (file.isDir())
{
const QDir dirw(path);
m_pInstance->m_currentContentsMap[path] = dirw.entryList(QDir::NoDotAndDotDot | QDir::AllDirs | QDir::Files, QDir::DirsFirst);
}
}
// 只要任何監控的目錄更新(添加、刪除、重命名),就會調用。
void FileSystemWatcher::directoryUpdated(const QString &path)
{
qDebug() << QString("Directory updated: %1").arg(path);
// 比較最新的內容和保存的內容找出區別(變化)
QStringList currEntryList = m_currentContentsMap[path];
const QDir dir(path);
QStringList newEntryList = dir.entryList(QDir::NoDotAndDotDot | QDir::AllDirs | QDir::Files, QDir::DirsFirst);
QSet<QString> newDirSet = QSet<QString>::fromList(newEntryList);
QSet<QString> currentDirSet = QSet<QString>::fromList(currEntryList);
// 添加了文件
QSet<QString> newFiles = newDirSet - currentDirSet;
QStringList newFile = newFiles.toList();
// 文件已被移除
QSet<QString> deletedFiles = currentDirSet - newDirSet;
QStringList deleteFile = deletedFiles.toList();
// 更新當前設置
m_currentContentsMap[path] = newEntryList;
if (!newFile.isEmpty() && !deleteFile.isEmpty())
{
// 文件/目錄重命名
if ((newFile.count() == 1) && (deleteFile.count() == 1))
{
qDebug() << QString("File Renamed from %1 to %2").arg(deleteFile.first()).arg(newFile.first());
}
}
else
{
// 添加新文件/目錄至Dir
if (!newFile.isEmpty())
{
qDebug() << "New Files/Dirs added: " << newFile;
foreach (QString file, newFile)
{
// 處理操作每個新文件....
}
}
// 從Dir中刪除文件/目錄
if (!deleteFile.isEmpty())
{
qDebug() << "Files/Dirs deleted: " << deleteFile;
foreach(QString file, deleteFile)
{
// 處理操作每個被刪除的文件....
}
}
}
}
// 文件修改時調用
void FileSystemWatcher::fileUpdated(const QString &path)
{
QFileInfo file(path);
QString strPath = file.absolutePath();
QString strName = file.fileName();
qDebug() << QString("The file %1 at path %2 is updated").arg(strName).arg(strPath);
}
main.cpp
#include <QtCore/QCoreApplication>
#include "filesystemwatcher.h"
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
FileSystemWatcher::addWatchPath("E:/Test");
return a.exec();
}
vs2010+qt5.5.1