LtdDocumentOptions Class

Summary

Provides extra options to use when saving a document using the LEADTOOLS Temporary Document (LTD) format.

Syntax

Objective-C

C++

Java

[SerializableAttribute()] 
[DataContractAttribute()] 
public class LtdDocumentOptions : DocumentOptions

<DataContractAttribute()> 
<SerializableAttribute()> 
Public Class LtdDocumentOptions  
   Inherits DocumentOptions

@interface LTLtdDocumentOptions : LTDocumentOptions <NSCopying, NSCoding>

public class LtdDocumentOptions extends DocumentOptions

[DataContractAttribute()] 
[SerializableAttribute()] 
public ref class LtdDocumentOptions : public DocumentOptions

Remarks

The options set in the LtdDocumentOptions class will be used when the user saves a document using the DocumentFormat.Ltd format.

The LEADTOOLS Temporary Document (LTD) format is a proprietary that support appending pages to an existing file, therefore, you can use the LTD format if you have large amount of pages to convert over multiple sessions. When calling the DocumentWriter.BeginDocument method with the DocumentFormat.Ltd format, the toolkit will check if the output file specified exists on disk. If it does, the new pages will be appended to the end of the file. When you are finished adding all the pages, you can use the DocumentWriter.Convert method to convert this temporary file to the desired output format such as PDF, HTML or DOC.

To change the options used with the LTD format, perform the following steps:

Use the DocumentWriter.GetOptions method of the DocumentWriter object being used. Passing DocumentFormat.Ltd to the format parameter. Note that the resulting object from the base DocumentOptions class needs to be cast to LtdDocumentOptions.
Use the various LtdDocumentOptions properties to change the options.
Use DocumentWriter.SetOptions to set the new options in the engine.
Now call the DocumentWriter.BeginDocument method (with DocumentFormat.Ltd for the format parameter) to create a new document and add the pages.

Note that this format supports both DocumentWriter.AddPage and DocumentWriter.InsertPage.

Currently, the LtdDocumentOptions class contains no extra options.

Example

This example will create a new LEADTOOLS Temporary Document (LTD) over multiple sessions then convert the result to a PDF file.

using Leadtools.Document.Writer; 
using Leadtools; 
using Leadtools.Codecs; 
 
public void LtdDocumentOptionsExample() 
{ 
   var inputFileName = Path.Combine(LEAD_VARS.ImagesDir, "Leadtools.docx"); 
   var outputFileName = Path.Combine(LEAD_VARS.ImagesDir, "Example.pdf"); 
   var ltdFileName = Path.Combine(LEAD_VARS.ImagesDir, "Example.ltd"); 
 
   // Check if the LTD file exists, if so, delete it so we start a new session 
   if (File.Exists(ltdFileName)) 
      File.Delete(ltdFileName); 
 
   // Get the number of pages 
   int pageCount; 
   using (var codecs = new RasterCodecs()) 
   { 
      codecs.Options.RasterizeDocument.Load.Resolution = 300; 
      pageCount = codecs.GetTotalPages(inputFileName); 
   } 
 
   // Loop through the pages and add them to the LTD 
   for (var pageNumber = 1; pageNumber < pageCount; pageNumber++) 
   { 
      AppendToLtd(inputFileName, pageNumber, ltdFileName); 
   } 
 
   // Create a new instance of the LEADTOOLS Document Writer 
   var docWriter = new DocumentWriter(); 
 
   // Set the PDF options to be PDF/A with Image/Text 
   var pdfOptions = docWriter.GetOptions(DocumentFormat.Pdf) as PdfDocumentOptions; 
   pdfOptions.DocumentType = PdfDocumentType.PdfA; 
   pdfOptions.ImageOverText = true; 
   docWriter.SetOptions(DocumentFormat.Pdf, pdfOptions); 
 
   // Now convert the LTD file we generated to PDF 
   Console.WriteLine("Converting LTD to PDF"); 
   docWriter.Convert(ltdFileName, outputFileName, DocumentFormat.Pdf); 
} 
 
private void AppendToLtd(string inputFileName, int pageNumber, string ltdFileName) 
{ 
   // This assumes we are in a separate session than the main program, so create 
   // a new instance of the RasterCodecs and DocumentWriter objects we need 
   var docWriter = new DocumentWriter(); 
   using (var codecs = new RasterCodecs()) 
   { 
      codecs.Options.RasterizeDocument.Load.Resolution = 300; 
 
      // Create a new (or append if the file exists) LTD document 
      docWriter.BeginDocument(ltdFileName, DocumentFormat.Ltd); 
 
      // Load the page as SVG document and as Raster image 
      Console.WriteLine("Loading page {0} ...", pageNumber); 
      using (var svgDocument = codecs.LoadSvg(inputFileName, pageNumber, null)) 
      using (var image = codecs.Load(inputFileName, pageNumber)) 
      { 
         // Add the page, notice we will be using image/text feature 
         var page = new DocumentWriterSvgPage(); 
         page.SvgDocument = svgDocument; 
         page.Image = image; 
 
         Console.WriteLine("Adding page {0} ...", pageNumber); 
         docWriter.AddPage(page); 
      } 
   } 
 
   // Finally finish writing the PDF file on disk 
   docWriter.EndDocument(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
}

Imports Leadtools.Document.Writer 
Imports Leadtools 
Imports Leadtools.Codecs 
 
Public Sub LtdDocumentOptionsExample() 
   Dim inputFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Leadtools.docx") 
   Dim outputFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Example.pdf") 
   Dim ltdFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Example.ltd") 
 
   ' Check if the LTD file exists, if so, delete it so we start a new session 
   If File.Exists(ltdFileName) Then File.Delete(ltdFileName) 
 
   ' Get the number of pages 
   Dim pageCount As Integer 
   Using codecs As New RasterCodecs() 
      codecs.Options.RasterizeDocument.Load.Resolution = 300 
      pageCount = codecs.GetTotalPages(inputFileName) 
   End Using 
 
   ' Loop through the pages and add them to the LTD 
   For pageNumber As Integer = 1 To pageCount 
      AppendToLtd(inputFileName, pageNumber, ltdFileName) 
   Next 
 
   ' Create a new instance of the LEADTOOLS Document Writer 
   Dim docWriter As New DocumentWriter() 
 
   ' Set the PDF options to be PDF/A with Image/Text 
   Dim pdfOptions As PdfDocumentOptions = DirectCast(docWriter.GetOptions(DocumentFormat.Pdf), PdfDocumentOptions) 
   pdfOptions.DocumentType = PdfDocumentType.PdfA 
   pdfOptions.ImageOverText = True 
   docWriter.SetOptions(DocumentFormat.Pdf, pdfOptions) 
 
   ' Now convert the LTD file we generated to PDF 
   Console.WriteLine("Converting LTD to PDF") 
   docWriter.Convert(ltdFileName, outputFileName, DocumentFormat.Pdf) 
End Sub 
 
Private Sub AppendToLtd(inputFileName As String, pageNumber As Integer, ltdFileName As String) 
   ' This assumes we are in a separate session than the main program, so create 
   ' a new instance of the RasterCodecs and DocumentWriter objects we need 
   Dim docWriter As New DocumentWriter() 
   Using codecs As New RasterCodecs() 
      codecs.Options.RasterizeDocument.Load.Resolution = 300 
 
      ' Create a new (or append if the file exists) LTD document 
      docWriter.BeginDocument(ltdFileName, DocumentFormat.Ltd) 
 
      ' Load the page as SVG document and as Raster image 
      Console.WriteLine("Loading page {0} ...", pageNumber) 
      Using svgDocument As ISvgDocument = codecs.LoadSvg(inputFileName, pageNumber, Nothing) 
         Using image As RasterImage = codecs.Load(inputFileName, pageNumber) 
            ' Add the page, notice we will be using image/text feature 
            Dim page As New DocumentWriterSvgPage() 
            page.SvgDocument = svgDocument 
            page.Image = image 
 
            Console.WriteLine("Adding page {0} ...", pageNumber) 
            docWriter.AddPage(page) 
         End Using 
      End Using 
   End Using 
 
   ' Finally finish writing the PDF file on disk 
   docWriter.EndDocument() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class