Powershell filewatcher
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So even if your script is busy processing a filesystem change, it should continue to log new filesystem changes and process them once PowerShell is done processing previous changes. Register-ObjectEvent -InputObject $fileWatcher -EventName Created -SourceIdentifier File. To use the FileSystemWatcher correctly, you should use it asynchronously and make sure it uses a queue. $fileWatcher.Path = "C:\users\Administrator\desktop"
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$fileWatcher = New-Object System.IO.FileSystemWatcher Write-Verbose ("Initializing FileSystemWatcher") -Verbose
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This, along with showing the LastAccess and LastWrite timestamps should provide some nice examples of using this Win32 API and how I can bypass both of these. You might remember me showing this off in a previous article and how it tracks everything from a file creation, to a modification and even the deletion of a file or files in a given directory. To make this a true overwriting of the file, I will call the SetLength() method and specify a 0 to tell the file to be 0 bytes and clear the file prior to adding new text.īefore I start to make my edits on a file, I am going kick off the filesystemwatcher subscription to monitor the location where I will be making all of the changes to a file. It is important to note that by specifying “Open”, it does not actually overwrite the entire file, it only starts at the beginning of the file and overwrites the text up to the point that the new text ends. I will use the Path and Mode and specify either “Open” to over write the file or “Append” to append to the file. In order for this to work properly, I have to encase the signature in a “here-string”. I just have to pre-pend the third line with “Public” to ensure that the method will be available when I call this signature using Add-Type. For the most part, everything is already set to go. I want to use the C# signature (as shown in the picture above) to modify and throw into my PowerShell code. Between this and some google (or bing) searches, I was able to isolate what I needed by using the SetFileTime method under kernel32.
#Powershell filewatcher how to
This is an amazing repository of everything Win32 and how to properly build the API calls using the signatures provided. Thus during this research I came across a win32 api method called SetFileTime, that if passed the correct arguments, would actually tell the file system operations to ignore updating the LastAccessTime as well as the LastWriteTime attributes of a given file! SetFileTime Methodįinding this method took a little bit of time and research by sifting through everyone’s favorite site for win32 APIs: Once all that was done, we found that during a test scan of a couple of folders, that the LastAccessTime attribute was being updated.