Error converting HTML to PDF

Question

Error converting HTML to PDF

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#1 by (2 votes)
#2 by (1 votes)

2

I need to make a PDF from a page HTML , but when I convert I get the following error:

Can not convert an object of type 'iTextSharp.text.html.simpleparser.TableWrapper' to type 'iTextSharp.text.Meta'.

Follow the code:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="PaginaQueSeraConvertida.aspx.cs" Inherits="converterHTMLparaPDF.PaginaQueSeraConvertida" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

  Exportação de ASPX para PDF

        <span id="export" runat="server"></span>


 </div>
    </form>
</body>
</html>
using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html;
using iTextSharp.text.html.simpleparser;
using System.Text;



namespace converterHTMLparaPDF
{
    public partial class PaginaQueSeraConvertida : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            criatabela();
            ConverteAspx2Pdf();
        }

        private void criatabela()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("<table width='95%' border='0'><tr><td width='8%' class='tblNormal' align='Right'>Protocolo:</td>");
            sb.Append("<td width='8%' class='tblNormal' align='Right'>Devedor:</td>");
            sb.Append("<td width='16%' class='tblNormal' align='Right'>CNPJ/CPF:</td>");
            sb.Append("</tr><tr>");
            sb.Append("<td class='tblNormal' align='Right'>Título:</td>");
            sb.Append("<td class='tblNormal' align='Right'>Apresentante:</td>");
            sb.Append("<td class='tblNormal' align='Right'>Data Vencimento:</td>");
            sb.Append("</tr><tr>");
            sb.Append("<td class='tblNormal' align='Right'>Valor:</td>");
            sb.Append("<td class='tblNormal' align='Right'>Saldo:</td>");
            sb.Append("<td class='tblNormal' align='Right'>Data apontamento:</td>");
            sb.Append("</tr><tr>");
            sb.Append("<td class='tblNormal' align='Right'>Livro:</td>");
            sb.Append("<td class='tblNormal' align='Right'>Folha:</td>");
            sb.Append("<td class='tblNormal' align='Right'>Data protesto:</td>");
            sb.Append("</tr><tr>");
            export.InnerHtml = sb.ToString();
        }


        private void ConverteAspx2Pdf()
        {

            string attachment = "inline; filename=ExportacaoAspx2Pdf.pdf";

            Response.ClearContent();
            Response.AddHeader("content-disposition", attachment);
            Response.ContentType = "application/pdf";

            StringWriter stw = new StringWriter();
            HtmlTextWriter htextw = new HtmlTextWriter(stw);

            this.RenderControl(htextw);

            Document document = new Document();
            PdfWriter.GetInstance(document, Response.OutputStream);

            document.Open();

            StringReader str = new StringReader(stw.ToString());
            HTMLWorker htmlworker = new HTMLWorker(document);

            htmlworker.Parse(str);
            document.Close();
            Response.Write(document);
            Response.End();

        }
    }
}

html c# asp.net webforms

asked by anonymous 01.11.2015 / 20:36

2 answers

2

'HTMLWorker' is deprecated the suggestion now is to use XMLWorker

Here's a simple example of using it:

StringReader html = new StringReader(@"
<div style='font-size: 18pt; font-weight: bold;'>
Mouser Electronics <br />Authorized Distributor</div><br /> <br />
<div style='font-size: 14pt;'>Click to View Pricing, Inventory, Delivery & Lifecycle Information:
</div>
<br />
<div>
<table>
<tr><td></td><td>
<a href='http://www.mouser.com/access/?pn=78211-009' 
style='color: Blue; font-size: 10pt; text-decoration: underline;'>78211-009</a></td></tr>
</table></div>    
");      
using (Document document = new Document()) {
  PdfWriter writer = PdfWriter.GetInstance(document, STREAM);
  document.Open();
  XMLWorkerHelper.GetInstance().ParseXHtml(
    writer, document, html
  );
}

One note is that to use XMLWorker you need your HTML well formatted, all tags closed correctly.

I hope I have helped.

02.11.2015 / 23:45

How to add color to the radio? ListView duplicating data in the android application

score 1 · Accepted Answer

Your HTML is missing the closing tag.

See below

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html.simpleparser;

namespace WebApplication1tiraduvidas
{
    public partial class PaginaQueSeraConvertida : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            criatabela();
            ConverteAspx2Pdf();
        }

        private void criatabela()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("<table width='95%' border='0'><tr><td width='8%' >Protocolo:</td>");
            sb.Append("<td width='8%' >Devedor:</td>");
            sb.Append("<td width='16%' >CNPJ/CPF:</td>");
            sb.Append("</tr><tr>");
            sb.Append("<td>Título:</td>");
            sb.Append("<td >Apresentante:</td>");
            sb.Append("<td >Data Vencimento:</td>");
            sb.Append("</tr><tr>");
            sb.Append("<td >Valor:</td>");
            sb.Append("<td >Saldo:</td>");
            sb.Append("<td >Data apontamento:</td>");
            sb.Append("</tr><tr>");
            sb.Append("<td >Livro:</td>");
            sb.Append("<td >Folha:</td>");
            sb.Append("<td >Data protesto:</td>");
            sb.Append("</tr></table>");
            Principal.InnerHtml = sb.ToString();
        }

        public override void VerifyRenderingInServerForm(Control control)
        {
        }

        private void ConverteAspx2Pdf()
        {
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "attachment;filename=TestPage.pdf");
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            StringWriter sw = new StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(sw);
            this.Page.RenderControl(hw);
            StringReader sr = new StringReader(sw.ToString());
            Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 100f, 0f);
            HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
            PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
            pdfDoc.Open();
            htmlparser.Parse(sr);
            pdfDoc.Close();
            Response.Write(pdfDoc);
            Response.End();
        }
    }
}

Also use the method:

public override void VerifyRenderingInServerForm(Control control)
            {
            }

and in aspx

<%@ Page Language="C#" AutoEventWireup="true" EnableEventValidation="false" CodeBehind="PaginaQueSeraConvertida.aspx.cs"
  Inherits="WebApplication1tiraduvidas.PaginaQueSeraConvertida" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title></title>
</head>
<body>
  <form id="form1" runat="server">
  <div id="Principal" runat="server">
    Exportação de ASPX para PDF
  </div>
  </form>
</body>
</html>