![]() # find the path to the desktop folder: $desktop = :: GetFolderPath ( 'Desktop' ) # specify the path to the folder you want to monitor: $Path = $desktop # specify which files you want to monitor $FileFilter = '*' # specify whether you want to monitor subfolders as well: $IncludeSubfolders = $true # specify the file or folder properties you want to monitor: $AttributeFilter = :: FileName, :: LastWrite # specify the type of changes you want to monitor: $ChangeTypes = :: Created, :: Deleted # specify the maximum time (in milliseconds) you want to wait for changes: $Timeout = 1000 # define a function that gets called for every change: function Invoke-SomeAction # subscribe your event handler to all event types that are # important to you. Whenever a change is detected, Invoke-SomeAction is called. This is straight-forward: the script below monitors your desktop and all of its subfolders for new files and for deletion of files. However, responding to events is not trivial in a single-threaded environment like PowerShell. This way, you cannot miss change events because the FileSystemWatcher is constantly monitoring. Instead, whenever a change occurs, an event is fired, and your script can respond to the events. Advanced Mode: In asynchronous mode, the FileSystemWatcher does not block PowerShell.This approachis very simple to implement however there is a chance to miss change events when they occur in rapid succession. This blocks PowerShell until either the change occurs or a timeout is reached. #Filewatcher quit code#Simple Mode: In synchronous mode, you ask the FileSystemWatcher to wait for a single change. NativeFileWatcherImpl - Watcher terminated with exit code 1 21:34:45,991 3195 WARN - .FileWatcher - File watcher failed.You can invoke the FileSystemWatcher in two ways: It can monitor a single folder or include all subfolders, and there is a variety of filters. The FileSystemWatcher object can monitor files or folders and notify PowerShell when changes occur. This way, you can create “drop” folders and respond to log file changes. Generally it's a bad call to make methods such as this public, as this makes it possible for any arbitrary code to call OnChanged even when doing so makes no sense.With a FileSystemWatcher, you can monitor folders for file changes and respond immediately when changes are detected. Notice the comment I added in the code above. Do you really want that to be allowed? Var watcher = source as FileSystemWatcher That said, you also could do it like this: public static void OnChanged(object source, FileSystemEventArgs e)Ĭonsole.WriteLine("File has been changed.") That's exactly how you should do it (have watcher just be a member field of your FileWatcher class). I guess I could do it by moving the declaration of the FileSystemWatcher object outside the method it is in, but I'm wondering if there's another way to do it. How can I, from the OnChanged method, set the watcher.EnableRaisingEvents flag to false? Public static void OnChanged(object source, FileSystemEventArgs e)Ĭonsole.WriteLine("File has been changed.\n") Watcher.Changed = new FileSystemEventHandler(OnChanged) Ĭonsole.Write("\nWatcher started. Watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName Watcher.Filter = ConfigurationManager.AppSettings Watcher.Path = ConfigurationManager.AppSettings Below is my code for a File watcher class I wrote: class FileWatcherįileSystemWatcher watcher = new FileSystemWatcher() ![]()
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