Bulk export OneNote 2013/2016 pages as HTML

onenote to html.ps1

# Copied from https://passbe.com/2019/bulk-export-onenote-2013-2016-pages-as-html/
# https://stackoverflow.com/questions/53689087/powershell-and-onenote
# http://thebackend.info/powershell/2017/12/onenote-read-and-write-content-with-powershell/
# https://stackoverflow.com/questions/53639041/how-to-access-contents-of-onenote-page

# Get export folder
Function Get-Folder($initialDirectory) {
	[System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms")|Out-Null
	$foldername = New-Object System.Windows.Forms.FolderBrowserDialog
	$foldername.Description = "Select an export folder"
	$foldername.rootfolder = "MyComputer"
	if($foldername.ShowDialog() -eq "OK")
	{
		$folder += $foldername.SelectedPath
	}
	return $folder
}

# Spider and find each page, create directory for each group
Function Spider-OneNote-Notebook {
	param( $onenote, $node, $path )
	foreach($child in $node.ChildNodes) {
		if ($child.HasChildNodes) {
			if ($child.isRecycleBin -ne 'true') {
				$folder = Join-Path -Path $path -ChildPath $child.name
				New-Item -Path $folder -ItemType directory | Out-Null
				Write-Host "Section: $($folder)"
				Spider-OneNote-Notebook -onenote $onenote -node $child -path $folder
			}
		} else {
			Export-OneNote-Page -onenote $onenote -node $child -path $path
		}
	}
}

# Export page
Function Export-OneNote-Page {
	param( $onenote, $node, $path )
	# Replace invalid file characters
	$name = ReplaceIllegal -text $node.name
	$file = $(Join-Path -Path $path -ChildPath "$($name).htm")
	Write-Host "Page: $($file)"
	# Export
	$onenote.Publish($node.ID, $file, 7, "")
	Export-OneNote-Attachments -onenote $onenote -node $node -path $path
}

# Copy embedded attachments
Function Export-OneNote-Attachments {
	param ( $onenote, $node, $path )
	$xml = ''
	$schema = @{one=”http://schemas.microsoft.com/office/onenote/2013/onenote”}
	$onenote.GetPageContent($node.ID, [ref]$xml)
	$xml | Select-Xml -XPath "//one:Page/one:Outline/one:OEChildren/one:OE/one:InsertedFile" -Namespace $schema | foreach {
		$file = Join-Path -Path $path -ChildPath $_.Node.preferredName
		Write-Host "Attachment: $($file)"
		Copy-Item $_.Node.pathCache -Destination $file
	}
}

Function ReplaceIllegal {
	param ( $text )
	$illegal = [string]::join('',([System.IO.Path]::GetInvalidFileNameChars())) -replace '\\','\\'
	$replaced = $text -replace "[$illegal]",'_'
	return $replaced
}

# Get export folder
$folder = Get-Folder

# Connect
$OneNote = New-Object -ComObject OneNote.Application
[xml]$Hierarchy = ""
$OneNote.GetHierarchy("", [Microsoft.Office.InterOp.OneNote.HierarchyScope]::hsPages, [ref]$Hierarchy)

# Loop over each notebook
foreach ($notebook in $Hierarchy.Notebooks.Notebook ) {
	$name = ReplaceIllegal -text $notebook.name
	$nf = Join-Path -Path $folder -ChildPath $name
	Write-Host "Notebook: $($nf)"
	New-Item -Path $nf -ItemType directory | Out-Null
	Spider-OneNote-Notebook -onenote $OneNote -node $notebook -path $nf
}