Bom dia,
Estou precisando gerar um pdf a partir do html ele funciona normal mas quando há alguma imagem html ele não exibe quando é gerado o pdf, já perdi alguns dias batendo a cabeça para resolver esse problema mas não consegui chegar em nenhuma resolução.
Se alguem poder me ajudar agradeço, deixarei o código abaixo.
protected void btn_Command(object sender, CommandEventArgs e)
{
HttpWebRequest request;
HttpWebResponse response;
Stream stream;
StreamReader streamReader;
string strSiteUrl = "localhost:52192/Default.aspx";
request = (HttpWebRequest)WebRequest.Create(strSiteUrl);
response = (HttpWebResponse)request.GetResponse();
stream = response.GetResponseStream();
streamReader = new StreamReader(stream);
string html = streamReader.ReadToEnd();
criarPDF(html, "Arquivo", "~/Css/StyleMateria.css");
}
private void criarPDF(string html, string nomeArquivo, string linkCss)
{
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.ContentType = "application/pdf";
HttpContext.Current.Response.AddHeader("content-disposition", "attachment; filename=" + nomeArquivo);
using (var document = new Document(PageSize.A4, 40, 40, 40, 40))
{
html = FormatImageLinks(html);
//define o output do HTML
var memStream = new MemoryStream();
TextReader xmlString = new StringReader(html);
PdfWriter writer = PdfWriter.GetInstance(document, memStream);
document.Open();
//Registra todas as fontes no computador cliente.
FontFactory.RegisterDirectories();
// Set factories
var htmlContext = new HtmlPipelineContext(null);
htmlContext.SetTagFactory(Tags.GetHtmlTagProcessorFactory());
// Set css
ICSSResolver cssResolver = XMLWorkerHelper.GetInstance().GetDefaultCssResolver(false);
cssResolver.AddCssFile(HttpContext.Current.Server.MapPath(linkCss), true);
// Exporta
IPipeline pipeline = new CssResolverPipeline(cssResolver, new HtmlPipeline(htmlContext, new PdfWriterPipeline(document, writer)));
var worker = new XMLWorker(pipeline, true);
var xmlParse = new XMLParser(true, worker);
xmlParse.Parse(xmlString);
xmlParse.Flush();
document.Close();
document.Dispose();
HttpContext.Current.Response.BinaryWrite(memStream.ToArray());
}
HttpContext.Current.Response.End();
HttpContext.Current.Response.Flush();
}
public static string FormatImageLinks(string input)
{
if (input == null)
{
return string.Empty;
}
string tempInput = input;
const string pattern = @"";
HttpContext context = HttpContext.Current;
foreach (Match m in Regex.Matches(input, pattern, RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.RightToLeft))
{
if (!m.Success) continue;
string tempM = m.Value;
const string pattern1 = "src=[\'|\"](.+?)[\'|\"]";
var reImg = new Regex(pattern1, RegexOptions.IgnoreCase | RegexOptions.Multiline);
Match mImg = reImg.Match(m.Value);
if (!mImg.Success) continue;
string src = mImg.Value.ToLower().Replace("src=", "").Replace("\"", "").Replace("\'", "");
if (src.StartsWith("http://") || src.StartsWith("https://")) continue;
//Inserimos a nova URL na tag img
src = "src=\"" + context.Request.Url.Scheme + "://" +
context.Request.Url.Authority + src + "\"";
try
{
tempM = tempM.Remove(mImg.Index, mImg.Length);
tempM = tempM.Insert(mImg.Index, src);
// inserimos a nova url img para todo o código html
tempInput = tempInput.Remove(m.Index, m.Length);
tempInput = tempInput.Insert(m.Index, tempM);
}
catch (Exception)
{
}
}
return tempInput;
}
