We Keep Coding

Adding hyperlink to existing image using Open XML SDK

I am struggling to work out a concise way to do what I'd imagine would be quite simple... I have a simple existing PowerPoint presentation with one slide and in it one image.
I want to programatically open this with the Open XML SDK (hosted in a .Net Core web application) and add a hyperlink to this, and save it... such that when it's reopened in PowerPoint, one can control+click on the image to visit the link.
using (var ppt = PresentationDocument.Open("powerpoint.pptx", true))
{
var image = ppt.PresentationPart.SlideParts.First().ImageParts.First();
// Code to add hyperlink to image here - a bit like:
// image.HyperLink = "http://somewebpage"
ppt.Save();
}

Thanks to the help from the comment from #Cindy Mester, I was able to strip down the suggested migration code from the Open XML SDK Productivity Tool to this:
using (var ms = new MemoryStream())
{
var original = File.OpenRead("withoutlink.pptx");
original.CopyTo(ms);
using (var ppt = PresentationDocument.Open(ms, true))
{
var slidePart1 = ppt.PresentationPart.SlideParts.First();
var slide1 = slidePart1.Slide;
var commonSlideData1 = slide1.GetFirstChild<CommonSlideData>();
var shapeTree1 = commonSlideData1.GetFirstChild<ShapeTree>();
var picture1 = shapeTree1.GetFirstChild<Picture>();
var nonVisualPictureProperties1 = picture1.GetFirstChild<NonVisualPictureProperties>();
var nonVisualDrawingProperties1 =
nonVisualPictureProperties1.GetFirstChild<NonVisualDrawingProperties>();
var nonVisualDrawingPropertiesExtensionList1 = nonVisualDrawingProperties1
.GetFirstChild<A.NonVisualDrawingPropertiesExtensionList>();
var relationshipId = "rId" + nonVisualPictureProperties1.Count();
var hyperlinkOnClick1 = new A.HyperlinkOnClick {Id = relationshipId};
nonVisualDrawingProperties1.InsertBefore(hyperlinkOnClick1,
nonVisualDrawingPropertiesExtensionList1);
slidePart1.AddHyperlinkRelationship(new Uri("http://www.google.com/", UriKind.Absolute), true,
relationshipId);
ppt.SaveAs("withlink.pptx");
}
In order that I could edit the file without modifying the original I copied to memory stream and opened that - In my web app I can the stream this memory stream back to the client.

HTML to PDF conversion using Aspose

I am new to Aspose but I have successfully converted several file formats into PDF's but I am struck with HTML to PDF conversion. I am able to convert a HTML file into a PDF successfully but the CSS part is not rendering into the generated PDF. Any idea on this? I saved www.google.com as my input HTML file. Here is my controller code.
using Aspose.Pdf.Generator
Pdf pdf = new Pdf();
pdf.HtmlInfo.CharSet = "UTF-8";
Section section = pdf.Sections.Add();
StreamReader r = File.OpenText(#"Local HTML File Path");
Text text2 = new Aspose.Pdf.Generator.Text(section, r.ReadToEnd());
pdf.HtmlInfo.ExternalResourcesBasePath = "Local HTML File Path";
text2.IsHtmlTagSupported = true;
text2.IsFitToPage = true;
section.Paragraphs.Add(text2);
pdf.Save(#"Generated PDF File Path");
Am i missing something? Any kind of help is greatly appreciated.
Thanks

My name is Tilal Ahmad and I am developer evangelist at Aspose.
Please use new DOM approach(Aspose.Pdf.Document) for HTML to PDF conversion. In this approach to render external resources(CSS/Images/Fonts) you need to pass resources path to HtmlLoadOptions() method. Please check following documentation links for the purpose.
Convert HTML to PDF (new DOM)
HtmlLoadOptions options = new HtmlLoadOptions(resourcesPath);
Document pdfDocument = new Document(inputPath, options);
pdfDocument.Save("outputPath");
Convert Webpage to PDF(new DOM)
// Create a request for the URL.
WebRequest request = WebRequest.Create("https:// En.wikipedia.org/wiki/Main_Page");
// If required by the server, set the credentials.
request.Credentials = CredentialCache.DefaultCredentials;
// Time out in miliseconds before the request times out
// Request.Timeout = 100;
// Get the response.
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
// Get the stream containing content returned by the server.
Stream dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd();
reader.Close();
dataStream.Close();
response.Close();
MemoryStream stream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(responseFromServer));
HtmlLoadOptions options = new HtmlLoadOptions("https:// En.wikipedia.org/wiki/");
// Load HTML file
Document pdfDocument = new Document(stream, options);
options.PageInfo.IsLandscape = true;
// Save output as PDF format
pdfDocument.Save(outputPath);

Try using media attribute in each style tag
<style media="print">
and then provide the html file to your Aspose.Pdf Generator.

Try this.. This is working nice for me
var license = new Aspose.Pdf.License();
license.SetLicense("Aspose.Pdf.lic");
var license = new Aspose.Html.License();
license.SetLicense("Aspose.Html.lic");
using (MemoryStream memoryStream = new MemoryStream())
{
var options = new PdfRenderingOptions();
using (PdfDevice pdfDevice = new PdfDevice(options, memoryStream))
{
using (var renderer = new HtmlRenderer())
{
using (HTMLDocument htmlDocument = new HTMLDocument(content, ""))
{
renderer.Render(pdfDevice, htmlDocument);
//Save memoryStream into output pdf file
}
}
}
}
content is string type which is my html content.

How to extract a link using xpath

I'm trying to make an application where you input a web url (http://www.explosm.net/comics/3104/) and it automatically saves a string with the first link it finds given the xpath (//*[#id="maincontent"]/div[2]/div[2]/div[1]/img), which is a picture I want to download.
I honestly have no clue where to even begin with this. I've tried the HtmlAgilityPack and the WebBrowser class, but I couldn't find anything to help me understand what to do and how to do it.
Any help will be greatly appreciated.

It is pretty easy with HTMLAgilityPack.
var w = new HtmlWeb();
var doc = w.Load("http://www.explosm.net/comics/3104/");
var imgNode = doc.DocumentNode.SelectSingleNode("//*[#id=\"maincontent\"]/div[2]/div[2]/div[1]/img");
var src = imgNode.GetAttributeValue("src", "");
The variable src will have the value http://www.explosm.net/db/files/Comics/Matt/Dont-be-a-dickhead.png.
All you have to do then is download the image:
var request = (HttpWebRequest)WebRequest.Create(src);
var response = request.GetResponse();
var stream = response.GetResponseStream();
//Here you have an Image object
Image img = Image.FromStream(stream);
//And you can save it or do whatever you want
img.Save(#"C:\file.png");

Is it possible to navigate a site by clicking links and then downloading the correct piece?

I'll try to explain what exactly I mean. I'm working on a program and I'm trying to download a bunch of images automatically from this site.
Namely, I want to download the big square icons from the page you get when you click on a hero name there, for example on the Darius page the image in the top left with the name DariusSquare.png and save that into a folder.
Is this possible or am I asking too much from C#?
Thank you very much!

In general, everything is possible given enough time and money. In your case, you need very little of former and none of latter :)
What you need to do can be described in following high-level steps:
Get all <a> tags within the table with heroes.
Use WebClient class to navigate to URL these <a> tags point to (i.e. to value of href attributes) and download the HTML
You will need to find some wrapper element that is present on each page with hero and that contains his image. Then, you should be able to get to the image src attribute and download it. Alternatively, perhaps each image has an common ID you can use?
I don't think anyone will provide you with an exact code that will perform these steps for you. Instead, you need to do some research of your own.

Yes it's possible, do a C# Web request and use the C# HTML Agility Pack to find the image url.
The you can use another web request to download the image:
Example downloading image from url:
public static Image LoadImage(string url)
{
var backgroundUrl = url;
var request = WebRequest.Create(backgroundUrl);
var response = request.GetResponse();
var stream = response.GetResponseStream();
return Image.FromStream(stream);
}
Example using html agility pack and getting some other data:
var request = (HttpWebRequest)WebRequest.Create(profileurl);
request.Method = "GET";
using (var response = request.GetResponse())
{
using (var stream = response.GetResponseStream())
{
using (var reader = new StreamReader(stream, Encoding.UTF8))
{
result = reader.ReadToEnd();
}
var doc = new HtmlDocument();
doc.Load(new StringReader(result));
var root = doc.DocumentNode;
HtmlNode profileHeader = root.SelectSingleNode("//*[#id='profile-header']");
HtmlNode profileRight = root.SelectSingleNode("//*[#id='profile-right']");
string rankHtml = profileHeader.SelectSingleNode("//*[#id='best-team-1']").OuterHtml.Trim();
#region GetPlayerAvatar
var avatarMatch = Regex.Match(profileHeader.SelectSingleNode("/html/body/div/div[2]/div/div/div/div/div/span").OuterHtml, #"(portraits[^(h3)]+).*no-repeat;", RegexOptions.IgnoreCase);
if (avatarMatch.Success)
{
battleNetPlayerFromDB.PlayerAvatarCss = avatarMatch.Value;
}
#endregion
}
}

asp.net open word document

I try to open a word document with c#.
When I open the document, the page is blocked after.
Here is the code :
HttpContext.Current.Response.Write(temp);
//HttpContext.Current.Response.End();
//HttpContext.Current.Response.Flush();
//HttpContext.Current.Response.Write(sw.ToString());
//HttpContext.Current.Response.clear();
//HttpContext.Current.Response.End();
//HttpContext.Current.Response.SuppressContent = true;
//HttpContext.Current.Response.Close();
//Response.Redirect(Page.Request.Url.AbsolutePath.Substring(0, Page.Request.Url.AbsolutePath.LastIndexOf("/")) + "/PIEditor.aspx?PostID=" + Request.Params["PostID"], true);`
//HttpContext.Current.Response.End();
As you see, I tried different options but without result, the window for opening or saving the document is displayed but I can't click on any buttons the page after. It looks like it is deactivated or stopped.

you can try GemBox.Document component to export Word document from ASP.NET application, if that is what you are trying to do.
Here is a sample C# code that should go in ASPX page code behind:
// Create a new empty document.
DocumentModel document = new DocumentModel();
// Add document content.
document.Sections.Add(new Section(document, new Paragraph(document, "Hello World!")));
// Microsoft Packaging API cannot write directly to Response.OutputStream.
// Therefore we use temporary MemoryStream.
using (MemoryStream documentStream = new MemoryStream())
{
document.Save(documentStream, SaveOptions.DocxDefault);
// Stream file to browser.
Response.Clear();
Response.ContentType = "application/vnd.openxmlformats";
Response.AddHeader("Content-Disposition", "attachment; filename=Document.docx");
documentStream.WriteTo(Response.OutputStream);
Response.End();
}

Try the below code:
//create new MemoryStream object and add PDF file’s content to outStream.
MemoryStream outStream = new MemoryStream();
//specify the duration of time before a page cached on a browser expires
Response.Expires = 0;
//specify the property to buffer the output page
Response.Buffer = true;
//erase any buffered HTML output
Response.ClearContent();
//add a new HTML header and value to the Response sent to the client
Response.AddHeader(“content-disposition”, “inline; filename=” + “output.doc”);
//specify the HTTP content type for Response as Pdf
Response.ContentType = “application/msword”;
//write specified information of current HTTP output to Byte array
Response.BinaryWrite(outStream.ToArray());
//close the output stream
outStream.Close();
//end the processing of the current page to ensure that no other HTML content is sent
Response.End();