Dealing with Com Object Terminating Error - powershell

Question

Ok, here is the problem, randomly the LoadFiles option doesn't like a certain input file and produces an error. This error is always a terminating error and I cannot figure out any way to get it to continue. Any Ideas?
Function ProcessImage {
Param(
[Parameter(ValueFromPipeline=$true)]
[System.IO.FileInfo]$File
)
If ($Excluded_Owners -notcontains $(get-acl -path $File.FullName).owner) { #Check owner of the file and compare it to list of blacklisted file owners.
Try{
$Image = New-Object -ComObject Wia.ImageFile
$Image.LoadFile($File.fullname)
} Catch{
LogWriter -OutPut "File Failed Process File in WIA - `"$($File.fullname)`""
Write-Error $_.Exception.Message
continue
}
If($Image.width -gt $PictureMinWidth -or $Image.height -gt $PictureMinHeight) { #Check image dimensions.
IF ($Script:Copy) {
$CopyTryCount = 0
While ((Test-Path -Path "$CopyDir\$($Script:MF_ImagesCopied + 1)$($File.extension)" -PathType Leaf) -EQ $False -AND $CopyTryCount -le 3) { #After the script says the picture was copied without error, verify it indeed was.
$CopyTryCount++
Try {
Copy-Item -Path $File.FullName -Destination "$CopyDir\$($Script:MF_ImagesCopied + 1)$($File.extension)" -Force #If the picture meets all requirements, attempt to copy the image.
} Catch {
LogWriter -Status "Failure" -Output "File Failed to Copy (Attempt $CopyTryCount) - `"$($File.fullname)`""
}
}
IF (Test-Path -Path "$CopyDir\$($Script:MF_ImagesCopied + 1)$($File.extension)" -PathType Leaf) { #Check the CopyDir directory for the image.
LogWriter -Status "Success" -Output "File Successfully Copied - `"$($File.fullname)`"" #If the image was copied successfully, log that.
[Int]$Script:MF_ImagesCopied += 1
$Temp_ProcessImage_Success=$True
} Else {
LogWriter -Status "Failure" -Output "File Failed to Copy after 3 tries - `"$($File.fullname)`"" #If the image was not copied successfully, log that.
[Int]$Script:MF_ImagesFailed+= 1
}
}
} Else {
LogWriter -Status "Skipped" -Output "Incorrect Dimensions - `"$($File.fullname)`""
[Int]$Script:MF_ImagesSkipped += 1
}
} Else {
LogWriter -Status "Skipped" -Output "Excluded Owner - `"$($File.fullname)`""
[Int]$Script:MF_ImagesSkipped += 1
}
}#End ProcessImage
This is the troublesome error.
ProcessImage : Exception calling "LoadFile" with "1" argument(s): "The
segment is already disca rded and cannot be locked. " At
L:\MediaFinder.ps1:400 char:83
+ If ($Images -AND $ImageFileTypes -contains "*"+$.Extension) {ProcessImage <<<< $}
+ CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException
+ FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,ProcessImage

Answer 1

You have caught the terminating error in a catch block and turned it into a non-terminating error. That's the first important step. BTW the continue in your catch block may also be causing premature termination. Continue is meant to be used with loops and with the Trap statement. Remove it and replace with a return statement.
The reason your function doesn't process any other files is that it isn't written quite right. So the second step is to put your script in a process block so it can process each $File object passed down the pipeline e.g.:
function ProcessImage {
param(
[Parameter(ValueFromPipeline=$true)]
$File
)
process {
try {
if ($file -eq 'foo') {
throw 'kaboom'
}
else {
"Processing $file"
}
}
catch {
Write-Error $_
return # can't continue - don't have valid file obj
}
"Still processing $file"
}
}
And if I run the above with these parameters, you can see that it processes objects after the one that throws a terminating error:
C:\PS> 'bar','foo','baz' | ProcessImage
Processing bar
Still processing bar
ProcessImage : kaboom
At line:1 char:21
+ 'bar','foo','baz' | ProcessImage
+ ~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException
+ FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,ProcessImage
Processing baz
Still processing baz