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JAVA FILEWATCHER WATCH FOR FILE TYPE UPDATE
JAVA FILEWATCHER WATCH FOR FILE TYPE WINDOWS

When the watch service detects an event, it is queued (to the watch service) - and a consumer process (like an application's thread) can handle the events as required.Specify the type of events of interest in the directory, like file creation or deletion.Register a directory with the watch service.

JAVA FILEWATCHER WATCH FOR FILE TYPE UPDATE

For example, a file manager application may use a watch service to monitor a directory for changes, so that it can update its display of the list of files when files are created, renamed or deleted. package has a file change notification API, called the Watch Service.Ī watch service watches registered objects for changes and the resulting events.

Notes on usage of Watch Service in Applications.

This includes an example, its description and notes on usage in applications. This blog post is about using Java SE 7's Watch Service API. Java 7 NIO 2 API's Watch Service - Notes and Example Virtual void OnFileChange(const std::wstring & path) overrideĬout << "\nWatcher is already started. FileWatcherTest.cpp : Defines the entry point for the console application.Ĭlass FileWatcherListener : public IFileWatcherListener M_pFileWatcherThread = std::unique_ptr(new std::thread(fileWatcherThread, std::ref(*this))) ĬFileSystemWatcher::~CFileSystemWatcher()Ībove class using a sample is shown below Void CFileSystemWatcher::OnFileRenamed(const std::wstring & sFile) Void CFileSystemWatcher::OnFileRemoved(const std::wstring & sFile) Void CFileSystemWatcher::OnFileAdded(const std::wstring & sFile) Void CFileSystemWatcher::OnFileChange(const std::wstring& fileName) Void CFileSystemWatcher::AddFileChangeListener(IFileWatcherListener* listener) Wcsncpy(filename, pNotify->FileName, pNotify->FileNameLength / 2) įilename = NULL ĬFileSystemWatcher::CFileSystemWatcher(const std::wstring& logDir):m_sDir(logDir), m_bRunning(false) PNotify = (FILE_NOTIFY_INFORMATION*)((char*)Buffer + offset) HANDLE hDir = CreateFile(watcherObj.GetDir().c_str(), // pointer to the file nameįILE_LIST_DIRECTORY, // access (read/write) modeįILE_SHARE_READ | FILE_SHARE_WRITE |FILE_SHARE_DELETE, // share modeįILE_FLAG_BACKUP_SEMANTICS, // file attributesįILE_NOTIFY_CHANGE_FILE_NAME, // filter conditions Void fileWatcherThread(CFileSystemWatcher& watcherObj) * Internal Thread function executing win32 file watcher API

Void OnFileRenamed(const std::wstring& sFile) * Funtion called when a file is renamed from watch directory Void OnFileRemoved(const std::wstring& sFile) * Funtion called when a file is removed from watch directory Void OnFileAdded(const std::wstring& sFile) * Funtion called when a file is added to watch directory Void OnFileChange(const std::wstring& fileNmae) * Funtion called when a file is chnaged in watcher directory * Watching a directory passed for file change and notifies if there is a change.ĬFileSystemWatcher(const std::wstring& logDir) Ĭonst std::wstring& GetDir() Virtual void OnFileRenamed(const std::wstring& path) = 0 Virtual void OnFileRemoved(const std::wstring& path) = 0 Virtual void OnFileAdded(const std::wstring& path) = 0 Virtual void OnFileChange(const std::wstring& path) = 0

JAVA FILEWATCHER WATCH FOR FILE TYPE WINDOWS

This CFileSystemWatcher is for Windows written in VC++ using win32 API. Languages like java or C# has built in classes for file watching.in Java The package provides a file change notification API, called the Watch Service API.C# has FileSystemWatcher class defined in System.IO.Ĭ++ doesn’t have a ready made class available for File System watching recently I had written a class for it here I am sharing it. Watching a directory for file change is a commonly occurring situations for programmers.