Monitor files with FileSystemWatcher - powershell

Question

I'm trying to create a PowerShell program to monitor when a file in a certain path is modified, and only if it now contains the string "loaded successfully", to Write-Host. Eventually an email component will be added if the string is not found in a certain amount of time.
$folder = 'C:\Users\afila\Desktop\TEST' # Enter the root path you want to monitor.
$files = Get-ChildItem $folder
$filter = '*.txt' # You can enter a wildcard filter here.
# In the following line, you can change 'IncludeSubdirectories to $true if required.
$fsw = New-Object IO.FileSystemWatcher $folder, $filter -Property #{
IncludeSubdirectories = $false;
NotifyFilter = [IO.NotifyFilters]'FileName, LastWrite'
}
# Function to search folder contents for a string
function Search-Folder {
$SearchTerm = "Loaded successfully"
foreach ( $file in $files) {
$text = Get-Content "$folder\$file"
if ($text | where {$text -like "*$SearchTerm*" }) {
Write-Host "The file '$file succeeded" -fore white
Out-File -FilePath C:\Users\afila\Desktop\SucceededLog.txt -Append -InputObject "The file '$file' completed at $timeStamp"
}
}
}
# Here, all the Changed event is registerd.
Register-ObjectEvent $fsw Changed -SourceIdentifier FileChanged -Action {
$name = $Event.SourceEventArgs.Name
$changeType = $Event.SourceEventArgs.ChangeType
$timeStamp = $Event.TimeGenerated
$searchTerm = "Loaded successfully"
foreach ($file in $files) {
$text = Get-Content "$folder\$file"
if ($text | where {$text -like "*$searchTerm*"}) {
Write-Host "The file '$name' was $changeType at $timeStamp" -fore magenta
Out-File -FilePath C:\Users\afila\Desktop\TestLogItems\TestLog.txt -Append -InputObject "The file '$name' was $changeType at $timeStamp"
}
}
}
# To stop the monitoring, run the following commands:
Unregister-Event FileChanged

Answer 1

The FileSystemWatcher already gives you the full path to the file via the property $Event.SourceEventArgs.Path, so you don't need to loop over a list of files.
Register-ObjectEvent $fsw Changed -SourceIdentifier FileChanged -Action {
$path = $Event.SourceEventArgs.Path
$changeType = $Event.SourceEventArgs.ChangeType
$timeStamp = $Event.TimeGenerated
$searchTerm = 'Loaded successfully'
if ((Get-Content $path) -like "*$searchTerm*"}) {
Write-Host "The file '$name' was $changeType at $timeStamp"
}
}