FileSystemWatcher to email change. Powershell - powershell

Question

I am attempting to write a powershell script that will look at a file until it gets modified and then email the change that happened. So far I have this code + the code that will send the email using Net.Mail.SmtpClient
$DOCDIR = [Environment]::GetFolderPath("MyDocuments")
$TARGETDIR = "$DOCDIR\MatchedLog"
if(!(Test-Path -Path $TARGETDIR )){
New-Item -ItemType directory -Path $TARGETDIR
}
$FILE = 'matched.txt'
$FSW = New-Object IO.FileSystemWatcher $TARGETDIR, $FILE - Property#{IncludeSubdirectories = $false;NotifyFilter = [IO.NotifyFilters]'FirstName, LastWrite'}
Register-ObjectEvent $FSW Changed -SourceIdentifier FileChanged -Action {
$name = $Event.SourceEventArgs.Name
$changeType = $Event.SourceEventArgs.ChangeType
}
The error I get is:
Register-ObjectEvent : Cannot bind argument to parameter 'InputObject' because it is null.
I am not sure exactly why this is happening

Answer 1

This looks like it might be a typo, but [IO.NotifyFilters] doesn't have the definition FirstName. You probably mean FileName
http://msdn.microsoft.com/en-us/library/system.io.notifyfilters.aspx

Answer 2

This works fine, it prints the change twice in a row for some reason. I saw many people having the same problem online but I am still trying to find the problem. I also need to get the line that has changed from "matched.txt" and print that instead of "Changed: /path/to/file/matched.txt"
$DOCDIR = [Environment]::GetFolderPath("MyDocuments")
$TARGETDIR = "$DOCDIR\MatchedLog"
if(!(Test-Path -Path $TARGETDIR )){
New-Item -ItemType directory -Path $TARGETDIR
}
$FILE = 'matched.txt'
$FSW = New-Object System.IO.FileSystemWatcher
$FSW.Path = $TARGETDIR
$FSW.IncludeSubdirectories = $false
$changed = Register-ObjectEvent $FSW "Changed" -Action{
write-host "Changed: $($eventArgs.FullPath)"
}