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Sample Kotlin code for using PDFTron SDK to convert Office documents to PDF (including Word, Excel, PowerPoint and Publisher) without needing any external dependencies or MS Office licenses. Office to PDF conversion can be performed on a Linux or Windows server to automate Office-centric workflows, or entirely in the user's client (web browser, mobile device). The conversion functionality can be combined with our Viewer to display or annotate Office files (docx, xlsx, pptx) on all major platforms, including Web, Android, iOS, Xamarin, UWP, and Windows. Learn more about our Kotlin PDF Library and Office Document Conversion Library.
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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------
package com.pdftron.android.pdfnetsdksamples.samples
import com.pdftron.android.pdfnetsdksamples.OutputListener
import com.pdftron.android.pdfnetsdksamples.PDFNetSample
import com.pdftron.android.pdfnetsdksamples.R
import com.pdftron.android.pdfnetsdksamples.util.Utils
import com.pdftron.common.PDFNetException
import com.pdftron.pdf.PDFDoc
import com.pdftron.pdf.PageIterator
import com.pdftron.pdf.struct.ContentItem
import com.pdftron.pdf.struct.SElement
import com.pdftron.pdf.struct.STree
import com.pdftron.sdf.SDFDoc
class LogicalStructureTest : PDFNetSample() {
override fun run(outputListener: OutputListener?) {
super.run(outputListener)
mOutputListener = outputListener
mFileList.clear()
printHeader(outputListener!!)
try // Extract logical structure from a PDF document
{
PDFDoc(Utils.getAssetTempFile(INPUT_PATH.toString() + "tagged.pdf")!!.getAbsolutePath()).use { doc ->
doc.initSecurityHandler()
mOutputListener!!.println("____________________________________________________________")
mOutputListener!!.println("Sample 1 - Traverse logical structure tree...")
run({
val tree: STree = doc.getStructTree()
if (tree.isValid()) {
mOutputListener!!.println("Document has a StructTree root.")
for (i in 0 until tree.getNumKids()) {
// Recursively get structure info for all all child elements.
ProcessStructElement(tree.getKid(i), 0)
}
} else {
mOutputListener!!.println("This document does not contain any logical structure.")
}
})
mOutputListener!!.println("\nDone 1.")
mOutputListener!!.println("____________________________________________________________")
mOutputListener!!.println("Sample 2 - Get parent logical structure elements from")
mOutputListener!!.println("layout elements.")
run({
val reader: com.pdftron.pdf.ElementReader = com.pdftron.pdf.ElementReader()
val itr: PageIterator = doc.getPageIterator()
while (itr.hasNext()) {
reader.begin(itr.next())
ProcessElements(reader)
reader.end()
}
})
mOutputListener!!.println("\nDone 2.")
mOutputListener!!.println("____________________________________________________________")
mOutputListener!!.println("Sample 3 - 'XML style' extraction of PDF logical structure and page content.")
run({
//A map which maps page numbers(as Integers)
//to page Maps(which map from struct mcid(as Integers) to
//text Strings)
val mcid_doc_map: MutableMap<Int, Map<Int, String>> = java.util.TreeMap<Int, Map<Int, String>>()
val reader: com.pdftron.pdf.ElementReader = com.pdftron.pdf.ElementReader()
val itr: PageIterator = doc.getPageIterator()
while (itr.hasNext()) {
val current: com.pdftron.pdf.Page? = itr.next()
reader.begin(current)
val page_mcid_map: MutableMap<Int, String> = java.util.TreeMap<Int, String>()
mcid_doc_map.put(current!!.getIndex(), page_mcid_map)
ProcessElements2(reader, page_mcid_map)
reader.end()
}
val tree: STree = doc.getStructTree()
if (tree.isValid()) {
for (i in 0 until tree.getNumKids()) {
ProcessStructElement2(tree.getKid(i), mcid_doc_map, 0)
}
}
})
mOutputListener!!.println("\nDone 3.")
doc.save(Utils.createExternalFile("LogicalStructure.pdf", mFileList).getAbsolutePath(), SDFDoc.SaveMode.LINEARIZED, null)
}
} catch (e: java.lang.Exception) {
mOutputListener!!.printError(e.getStackTrace())
}
for (file in mFileList) {
addToFileList(file)
}
printFooter(outputListener)
}
companion object {
private var mOutputListener: OutputListener? = null
private val mFileList: java.util.ArrayList<String> = java.util.ArrayList<String>()
fun PrintIndent(indent: Int) {
mOutputListener!!.println()
for (i in 0 until indent) mOutputListener!!.print(" ")
}
// Used in code snippet 1.
@Throws(PDFNetException::class)
fun ProcessStructElement(element: SElement, indent: Int) {
var indent = indent
if (!element.isValid()) {
return
}
// Print out the type and title info, if any.
PrintIndent(indent++)
mOutputListener!!.print("Type: " + element.getType())
if (element.hasTitle()) {
mOutputListener!!.print(". Title: " + element.getTitle())
}
val num: Int = element.getNumKids()
for (i in 0 until num) {
// Check is the kid is a leaf node (i.e. it is a ContentItem).
if (element.isContentItem(i)) {
val cont: ContentItem = element.getAsContentItem(i)
val type: Int = cont.getType()
val page: com.pdftron.pdf.Page = cont.getPage()
PrintIndent(indent)
mOutputListener!!.print("Content Item. Part of page #" + page.getIndex())
PrintIndent(indent)
when (type) {
ContentItem.e_MCID, ContentItem.e_MCR -> mOutputListener!!.print("MCID: " + cont.getMCID())
ContentItem.e_OBJR -> {
mOutputListener!!.print("OBJR ")
val ref_obj: com.pdftron.sdf.Obj = cont.getRefObj()
if (ref_obj != null) mOutputListener!!.print("- Referenced Object#: " + ref_obj.getObjNum())
}
else -> {
}
}
} else { // the kid is another StructElement node.
ProcessStructElement(element.getAsStructElem(i), indent)
}
}
}
// Used in code snippet 2.
@Throws(PDFNetException::class)
fun ProcessElements(reader: com.pdftron.pdf.ElementReader) {
var element: com.pdftron.pdf.Element?
// Read page contents
while (true) {
element = reader.next()
if (element == null) {
break
}
// In this sample we process only paths & text, but the code can be
// extended to handle any element type.
val type: Int = element.getType()
if (type == com.pdftron.pdf.Element.e_path || type == com.pdftron.pdf.Element.e_text || type == com.pdftron.pdf.Element.e_path) {
when (type) {
com.pdftron.pdf.Element.e_path -> mOutputListener!!.print("\nPATH: ")
com.pdftron.pdf.Element.e_text -> mOutputListener!!.print("""
TEXT: ${element.getTextString()}
""".trimIndent())
com.pdftron.pdf.Element.e_form -> mOutputListener!!.print("\nFORM XObject: ")
}
// Check if the element is associated with any structural element.
// Content items are leaf nodes of the structure tree.
val struct_parent: SElement = element.getParentStructElement()
if (struct_parent.isValid()) {
// Print out the parent structural element's type, title, and object number.
mOutputListener!!.print(" Type: " + struct_parent.getType()
+ ", MCID: " + element.getStructMCID())
if (struct_parent.hasTitle()) {
mOutputListener!!.print(". Title: " + struct_parent.getTitle())
}
mOutputListener!!.print(", Obj#: " + struct_parent.getSDFObj().getObjNum())
}
}
}
}
// Used in code snippet 3.
//typedef map<int, string> MCIDPageMap;
//typedef map<int, MCIDPageMap> MCIDDocMap;
// Used in code snippet 3.
@Throws(PDFNetException::class)
fun ProcessElements2(reader: com.pdftron.pdf.ElementReader, mcid_page_map: MutableMap<Int, String>) {
var element: com.pdftron.pdf.Element?
// Read page contents
while (true) {
element = reader.next()
if (element == null) {
break
}
// In this sample we process only text, but the code can be extended
// to handle paths, images, or any other Element type.
val mcid: Int = element.getStructMCID()
if (mcid >= 0 && element.getType() == com.pdftron.pdf.Element.e_text) {
val `val`: String = element.getTextString()
if (mcid_page_map.containsKey(mcid)) mcid_page_map.put(mcid, mcid_page_map[mcid] + `val`) else mcid_page_map.put(mcid, `val`)
}
}
}
// Used in code snippet 3.
@Throws(PDFNetException::class)
fun ProcessStructElement2(element: SElement, mcid_doc_map: Map<Int, Map<Int, String>>, indent: Int) {
if (!element.isValid()) {
return
}
// Print out the type and title info, if any.
PrintIndent(indent)
mOutputListener!!.print("<" + element.getType())
if (element.hasTitle()) {
mOutputListener!!.print(" title=\"" + element.getTitle() + "\"")
}
mOutputListener!!.print(">")
val num: Int = element.getNumKids()
for (i in 0 until num) {
if (element.isContentItem(i)) {
val cont: ContentItem = element.getAsContentItem(i)
if (cont.getType() == ContentItem.e_MCID) {
val page_num: Int = cont.getPage().getIndex()
if (mcid_doc_map.containsKey(page_num)) {
val mcid_page_map = mcid_doc_map[page_num]!!
val mcid_key: Int = cont.getMCID()
if (mcid_page_map.containsKey(mcid_key)) {
mOutputListener!!.print(mcid_page_map[mcid_key])
}
}
}
} else { // the kid is another StructElement node.
ProcessStructElement2(element.getAsStructElem(i), mcid_doc_map, indent + 1)
}
}
PrintIndent(indent)
mOutputListener!!.print("</" + element.getType() + ">")
}
/**
* @param args
*/
}
init {
setTitle(R.string.sample_logicalstructure_title)
setDescription(R.string.sample_logicalstructure_description)
}
}