<< Click to Display Table of Contents >> Navigation:  Gnostice Document Studio .NET > Going Deeper > Document Engines > Working with PDF > Enhancement > Convert to a ZUGFeRD compatible invoice

In this section we present example code to convert a PDF invoice into a ZUGFeRD compliant one. Before proceeding further please make sure that the prerequisite steps as listed in the Document Engines parent topic are followed.

 

The product supports generation of Level B (PDF/A-3b) complaint PDF, and the input PDF should already be PDF/A3 complaint (for example all fonts should be embedded). You can download the input files referenced in the example code from the links given below:

 

1.InputInvoiceForZUGFeRD.pdf

2.factur-x.xml

3.PDFA3B_With_ZUGFerd_xml_v_2_2_Sample_Metadata.xml

 

Given below is the sample code.

 

string inputXMLMetadataFile = @"PDFA3B_With_ZUGFerd_xml_v_2_2_Sample_Metadata.xml";
string xmlAttachment = @"factur-x.xml";
string inputFileName = @"InputInvoiceForZUGFeRD.pdf";
string outputFileName = @"OutputInvoice_ZUGFeRD.pdf";
 
using (var pdfDoc = new PDF())
{
   pdfDoc.LoadDocument(inputFileName);
 
   // Attach the ZUGFeRD invoice xml
   byte[] attachmentFileBytes = File.ReadAllBytes(xmlAttachment);
   pdfDoc.AttachDocument(fileName: "factur-x.xml", attachmentFileBytes, lastModifiedDateAndTime: DateTime.Now, description: "Factur-X/ZUGFeRD-Rechnung", 
         associatedFileRelationship: AFRelationship.Alternative, mimeType: "text/xml", isAssociatedFile: true);
   
   // Optionally, set the PageMode to UseAttachments to show the attachments tab in reader applications such as Adobe Reader when the document is opened.
   pdfDoc.PageMode = PDFPageMode.UseAttachments;
 
   // Set the XML metadata
   var inputXMLMetadata = File.ReadAllText(inputXMLMetadataFile, Encoding.UTF8);
   pdfDoc.SetXMLMetadata(inputXMLMetadata);
 
   // set color profile options such as document's OutputIntent
   var colorProfileOptions = new PDFColorProfileOptions
   {
      DocumentOutputIntent = PDFCmykColorProfile.FromStandard(StandardCmykColorProfile.ISOCoatedV2),
      FallbackRgbResource = PDFRgbColorProfile.FromStandard(StandardRgbColorProfile.SRgb2014),
      FallbackCmykResource = PDFCmykColorProfile.FromStandard(StandardCmykColorProfile.ISOCoatedV2),
      PreserveExistingResources = false
   };
   pdfDoc.ColorProfileOptions = colorProfileOptions;
 
   // Save the document as PDF/A-3b
   pdfDoc.Save(outputFileName);
}