Text, Image & HTML Documents to PDF Conversion in a MultiPage PDF File.

We wanted to convert text, image & HTML in to Single Multipage PDF based on selections.

                   //Create Aspose PDF Document Object

            Aspose.Pdf.Document m_PDFDocument = new Aspose.Pdf.Document();

            System.IO.MemoryStream mOutStream = newMemoryStream();

            foreach (string FilePath in Filnames)

            {

                string ext = System.IO.Path.GetExtension(FilePath);

                byte m_binaryData = System.IO.File.ReadAllBytes(FilePath);

                if (ext.ToUpper() == "TXT")

                {

                    Aspose.Pdf.Page mPage = m_PDFDocument.Pages.Add();

                    System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();

                    Aspose.Pdf.Text.TextFragment t2 = new Aspose.Pdf.Text.TextFragment(enc.GetString(m_BinaryData));

                    mPage.Paragraphs.Add(t2);

                }

                elseif (ext.ToUpper() == "HTML")

                {

                    //Create HTML PDF Document

                    Aspose.Pdf.Document mHTMLPDFDoc;

                    HtmlLoadOptions htmlLoadOptions = newHtmlLoadOptions();

                    System.IO.MemoryStream mStream;

                    mStream = newMemoryStream(m_BinaryData);

                    mHTMLPDFDoc = new Aspose.Pdf.Document(mStream, htmlLoadOptions);

                    foreach (Aspose.Pdf.Page mPDFPage in mHTMLPDFDoc.Pages)

                    {

                        m_PDFDocument.Pages.Add(mPDFPage);

                    }

                }

                else

                {

                    //Image conversion Code.

                }   

            }

            m_PDFDocument.Save(mOutStream);      

Issue: Above is the code snippet using new DOM approach; HTML Document not able to convert to PDF properly, it lost its font related information and shows the junk characters. Have a look on attached “Output_Sample.pdf”. If you look over my observation mentioned below, the issue only replicates when we are adding pages of Object which represents HTML Content in to the Main PDF Object which contains pdf representation of different types of document like Text, images & HTML.

We have also tried out by creating HTMLFragement object from HTML String; but it throws an Out of Memory exception with one of our user’s HTML File while converting to PDF. However, it will be able to converted to PDF using new DOM approach but having the issue mentioned above. 

mPage.Paragraphs.Add(mHTMLFragement);  

Observation: if we create the HTMLPDF Object and call the “Save” method of that object instead of adding the pages of it in to the Main PDF Object then it will convert to PDF properly.  Have a look on below Code:

//Create HTML PDF Document

                    Aspose.Pdf.Document mHTMLPDFDoc;

                    HtmlLoadOptions htmlLoadOptions = newHtmlLoadOptions();

                    System.IO.MemoryStream mStream;

                    mStream = newMemoryStream(m_BinaryData);

                    mHTMLPDFDoc = new Aspose.Pdf.Document(mStream, htmlLoadOptions);

                    mHTMLPDFDoc.Save(mOutStream);