ITextSharp: How to Get an Embedded Image Resource

Question

I am parsing HTML with some images inside this.

These images are stored as an embedded resource, not in the file system.

as I know, I need to install a custom image provider in the HtmlPipelineContext, and this provider should get the image path or itextsharp image.

The question is, does anyone know which abstract image provider method I need to implement? And How?

this is my code:

var list = new List<string> { text }; byte[] renderedBuffer; using (var outputMemoryStream = new MemoryStream()) { using ( var pdfDocument = new Document(PageSize.A4, 30, 30, 30, 30)) { var pdfWriter = PdfWriter.GetInstance(pdfDocument, outputMemoryStream); pdfWriter.CloseStream = false; pdfDocument.Open(); HtmlPipelineContext htmlContext = new HtmlPipelineContext(new CssAppliersImpl()); htmlContext.SetImageProvider(new MyImageProvider()); htmlContext.SetTagFactory(Tags.GetHtmlTagProcessorFactory()); ICSSResolver cssResolver = XMLWorkerHelper.GetInstance().GetDefaultCssResolver(true); CssResolverPipeline pipeline = new CssResolverPipeline(cssResolver, new HtmlPipeline(htmlContext, new PdfWriterPipeline(pdfDocument, pdfWriter))); XMLWorker worker = new XMLWorker(pipeline, true); XMLParser p = new XMLParser(worker); foreach (var htmlText in list) { using (var htmlViewReader = new StringReader(htmlText)) { p.Parse(htmlViewReader); } } } renderedBuffer = new byte[outputMemoryStream.Position]; outputMemoryStream.Position = 0; outputMemoryStream.Read(renderedBuffer, 0, renderedBuffer.Length); } 

Thanks in advance.

Answer 1

Using a custom image provider is not supported. The only thing it really supports is changing the root paths.

However, here is one solution to the problem:

Create a new html tag called <resimg src="{resource name}"/> and write your own tag processor for it.

Here's the implementation:

 /// <summary> /// Our custom HTML Tag to add an IElement. /// </summary> public class ResourceImageHtmlTagProcessor : AbstractTagProcessor { public override IList<IElement> End(IWorkerContext ctx, Tag tag, IList<IElement> currentContent) { var src = tag.Attributes["src"]; var bitmap = (Bitmap)Resources.ResourceManager.GetObject(src); if (bitmap == null) throw new RuntimeWorkerException("No resource with the name: " + src); var converter = new ImageConverter(); var image = Image.GetInstance((byte[])converter.ConvertTo(bitmap, typeof(byte[]))); HtmlPipelineContext htmlPipelineContext = this.GetHtmlPipelineContext(ctx); return new List<IElement>(1) { this.GetCssAppliers().Apply( new Chunk((Image)this.GetCssAppliers().Apply(image, tag, htmlPipelineContext), 0f, 0f, true), tag, htmlPipelineContext) }; } } 

To set up a new processor, replace the line where you specify TagFactory as follows:

 var tagProcessorFactory = Tags.GetHtmlTagProcessorFactory(); tagProcessorFactory.AddProcessor(new ResourceImageHtmlTagProcessor(), new[] { "resimg" }); htmlContext.SetTagFactory(tagProcessorFactory);