filesystemwatcher | 易学教程

What are practical limits on the number of FileSystemWatcher instances a server can handle?

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问题 I have a windows service that is currently instantiating about a dozen FileSystemWatcher instances to monitor shared folders across the corporate network for files to be processed. I am looking into adding more instances so I'm wondering if anyone here has experience (with production systems) as to what are practical limits on number of FileSystemWatcher instances a production system can reliably handle? Edit: In my case, the InternalBufferSize property is not modified so the

FileSystemWatcher used to watch for folder/file open

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I have browsed around but cannot find any information on what I am seeking, if there is another post that already goes over this then I apologize. I am seeking help with code that will monitor a specific folder for when the folder is opened by another person or when a file under said folder is opened. At this point I can see when a user opens and modifies any files but if they just open the file to view it, it does not throw an event even when I add LastAccessed. Any information or help would be appreciated. Folder name is C:\Junk Code in C# 4.0: [PermissionSet(SecurityAction.Demand, Name =

FileSystemWatcher to watch UNC path

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There are no shortage of questions on this topic, but I'm still having trouble. Here is my situation. I've got a service that I need to watch a path that is specified in the config file. It works great when I used a local drive. However, when I change it to something like \\server2\secondary\temp\watch_folder the service does not start. The error in the log is The directory name \\server2\secondary\temp\watch_folder is invalid. If I copy that directly into Windows Explorer the folder opens fine. If I take my code and paste it into an old Winforms app it works fine. I've tried all of the "Log

Watching for file and directory changes in Java

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问题 I'm writing here mostly for advice on where to start. I've already implemented a class that will recursively watch a directory using Java's WatchService. It works quite alright for detecting changes, but I've noticed a fatal flaw: I cannot delete directories that are being watched that contain directories that are being watched. This seems to be a limitation of WatchService. I have also looked into Apache's VFS FileListener a bit, but before I spend another 6-or-so hours of my time building

How do I know when a file has been modified in a VBA Macro?

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问题 Is there a way to watch a file in VBA (which is essentially VB6), so that I know when the file has been modified? -- similar to this only I don't want to know when a file is unused , just when its modified . The answers I've found have recommended using "FileSystemWatcher" and the Win32 API "FindFirstChangeNotification". I can't figure out how to use these though, any idea? 回答1: Okay, I put together a solution that is able to detect file system changes, in VBA (VB6). Public objWMIService,

Detecting moved files using FileSystemWatcher

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I realise that FileSystemWatcher does not provide a Move event, instead it will generate a separate Delete and Create events for the same file. (The FilesystemWatcher is watching both the source and destination folders). However how do we differentiate between a true file move and some random creation of a file that happens to have the same name as a file that was recently deleted? Some sort of property of the FileSystemEventArgs class such as "AssociatedDeleteFile" that is assigned the deleted file path if it is the result of a move, or NULL otherwise, would be great. But of course this doesn

VB.NET FileSystemWatcher Multiple Change Events

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问题 I have the following code: Imports System.IO Public Class Blah Public Sub New() InitializeComponent() Dim watcher As New FileSystemWatcher("C:\") watcher.EnableRaisingEvents = True AddHandler watcher.Changed, AddressOf watcher_Changed End Sub Private Sub watcher_Changed(ByVal sender As Object, ByVal e As FileSystemEventArgs) MsgBox(e.FullPath) End Sub End Class When I run it and save changes to a file on my C drive, the code works great, except it executes the watcher_Changed() method four

Does anyone have a FileSystemWatcher-like class in C++/WinAPI?

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问题 I need a .Net's FileSystemWatcher analog in raw C++/WinAPI. I almost started to code one myself using FindFirstChangeNotification/FindNextChangeNotification, but then it occurred to me that I am probably not the first one who needs this and maybe someone will be willing to share. Ideally what I need is a class which can be used as follows: FileWatcher fw; fw.startWatching("C:\MYDIR", "filename.dat", FileWatcher::SIZE | FileWatcher::LAST_WRITE, &myChangeHandler); ... fw.stopWatching(); Or if

How to set filter for FileSystemWatcher for multiple file types?

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问题 Everywhere I find these two lines of code used to set filter for file system watcher in samples provided.. FileSystemWatcher watcher = new FileSystemWatcher(); watcher.Filter = "*.txt"; //or watcher.Filter = "*.*"; But I want my watcher to monitor more file types, but not all. How can I achieve this: //watcher.Filter = "*.txt" | "*.doc" | "*.docx" | "*.xls" | "*.xlsx"; I tried these: watcher.Filter = "*.txt|*.doc|*.docx|*.xls|*.xlsx"; // and watcher.Filter = "*.txt;*.doc;*.docx;*.xls;*.xlsx*"

How reliable is the FileSystemWatcher in .netFramwork 4?

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问题 Has anyone used the FileSystemWatcher in framework 4 and have you encountered any problems? i am using it in a windows service and i cant afford for it to fail. I have heard from a friend that it is not very reliable but I have been testing for a few hours now and i havent had any problems but i am still doubting using it..... i would appreciate any advice on this matter, i dont want to deliver the app to the the client and then realise that this thing is going to crash.... Thanks Thanks for