CefSharp possible to load html content? - c#

I need to create a application which loads a html "template" file and parse them with current data values. So far no problemm but does anyone knows how to load the parsed html value into the cefsharp browser ?
I found some old topics here with an "loadHtml()" function. But this function isnt there anymore.
Thanks in advance

You need to add a using CefSharp; statement to your code to access the LoadHtml extensions methods.
chromiumWebBrowser.LoadHtml(html);

const string html = "<html><head><title>Test</title></head><body><h1>Html Encoded in URL!</h1></body></html>";
var base64EncodedHtml = Convert.ToBase64String(Encoding.UTF8.GetBytes(html));
browser.Load("data:text/html;base64," + base64EncodedHtml);
From the project wiki on github: Loading HTML/CSS/JavaScript/etc from disk/database/embedded resource/stream

Related

Rotativa breaks the HTML when there is more than one page

I am creating a pdf from HTML using Rotativa, and my code looks like this
var CustomSwitches = "--footer-right \"Date: [date] [time]\" " + "--footer-center \"Page: [page] of [toPage]\" --footer-line --footer-font-size \"9\" --footer-spacing 5 --footer-font-name \"calibri light\"";
var rotativaOptions = new DriverOptions { CustomSwitches = CustomSwitches,PageSize = Size.A4};
return new ViewAsPdf("~/Views/Partials/Report/SummaryReportspdf.cshtml")
{
RotativaOptions = rotativaOptions
};
All looks good to me, but when there is more than one page, page breaks even. And it looks like below image
How can I solve this issue?
I solved this problem using the latest version of wkhtmltopdf (currently version 0.12.5)
You can download it from here: https://wkhtmltopdf.org/downloads.html
Hope it helps!
Syncfusion HTML to PDF converter in C# provides an option to convert HTML to PDF without text and image split across the pages. Refer the help documentation for more information
https://help.syncfusion.com/file-formats/pdf/convert-html-to-pdf/webkit#split-text
Note: I work for Syncfusion.

Converting aspx page to image file

I have c# dynamic aspx page after new property add I create for record brochure
http://veneristurkey.com/admin/Brochure.aspx?Admin=PropertiesBrochureA4&id=36
but I want to this convert image file I am searching on internet but all with webbrowser and windows forms. I need on page load show not css type also image file. jpg, png or tiff how i can do this. i need to see sample code..
saving aspx page into an image 2
As I mentioned in my comment, your best bet is to opt for attempting to render HTML to an image.
Here is the link for a library that will allow your to render html to an image:
http://htmlrenderer.codeplex.com/
Here is code that does exactly what you're asking:
http://amoghnatu.wordpress.com/2013/05/13/converting-html-text-to-image-using-c/
Now all you have left is to get the html, since I'm assuming you don't want this to render to the browser prior to generating this image - you should look into grabbing the rendered html from the aspx page on the server prior to returning it, and then just return the image. To render a page:
https://stackoverflow.com/a/647866/1017882
Sorted.
If you do not mind using a commandline tool you can have a look at wkhtmltopdf. The package include a wkhtmltoimage component that can be used to convert HTML to image, using
wkhtmltoimage [URL] [Image Path]
Codaxy also wrote a wkhtmltopdf c# wrapper available through the NuGet package manager. I'm not sure if the wkhtmltoimage component was included, but it should be easy enough to figure out how they wrap the wkhtml components.
i fixed my problem with screenshot machine API they are my code..
public void resimyap()
{
var procad = WS.Satiliklars.Where(v => v.ForSaleID == int.Parse(Request.QueryString["id"])).FirstOrDefault();
var imageBytes = GetBytesFromUrl("http://api.screenshotmachine.com/?key=xxxxxx&size=F&url=http://xxxxxxx.com/a4.aspx?id=" + procad.ForSaleID);
string root = Server.MapPath("~/");
// clean up the path
if (!root.EndsWith(#"\"))
root += #"\";
// make a folder to store the images in
string fileDirectory = root + #"\images\a4en\";
// create the folder if it does not exist
if (!System.IO.Directory.Exists(fileDirectory))
System.IO.Directory.CreateDirectory(fileDirectory);
WriteBytesToFile( fileDirectory + + procad.ForSaleID + ".png", imageBytes);
Yes i also try wkhtmltopdf c# wrapper but in pdf or image converting time my computer fan goin crayz. also i must upload server exe file and my hosting firm didnt support them

WebBrowser Control c#: finding particular link and "clicking" it programmatically?

I am working on csv downloader project ,i need to download the CSV files generated on the webpage . and using html agility , i found the exact link that contain the link for csv file
Download file in csv format
now i want , without any activity from my side , the application must detect this link in the web page ( i could do it by Htmlagility ) and should download the file once the web page fully navigated in Web browser in my app. I tried some example in one of the SO click here post but getting
Error :Object reference not set to an instance of an object.
HtmlElementCollection links = webBrowser.Document.GetElementsByTagName("A");
foreach (HtmlElement link in links) // this ex is given another SO post
{
if (link.InnerText.Equals("My Assigned"))
link.InvokeMember("Click");
}
Can any body suggest how to do it ??
Solved :
I changed to HtmlElementCollection links = webBrowser.Document.GetElementsByTagName("A"); to HtmlElementCollection links = webBrowser1.Document.Links and used
if (link.InnerText.Contains("My Assigned"))
{
link.InvokeMember("Click");
}
. any one who better solution?
InnerText might be null so build in a safeguard, to check for null:
if ((link.InnerText != null) && (link.InnerText.Equals("My Assigned")) )
link.InvokeMember("Click");
Actually, I would get rid of HTMLAgility pack (its pretty bad) and just go/loop through it yourself. Also, don't use innerText, because based on your examples, there doesn't seem to be an innertext in at least one of the links. Use the .href attribute and check for the .csv extension.
link.href.EndsWith(".csv")
And if there are more than one .cvs on each page, look for some url string or innertext property to refine it.
Also, the reason why your .GetElementsByTagName("A") was not working was because TagName refers to the name attribute of any particular TAG. So, you were saying, Get all TAG's with the TagType name="A"... does that make sense? I think there is a .GetElementsByTag[Type] or something like that which you can use to base it on the tag type and not the name attribute of a TAG.
Also, how are you downloading the .csv file? Is a "download dialog" box coming up or are you just showing people in the webbrowser control? (curious how you've handled that part).

How to get raw page source (not generated source) from c#

The goal is to get the raw source of the page, I mean do not run the scripts or let the browsers format the page at all. for example: suppose the source is <table><tr></table> after the response, I don't want get <table><tbody><tr></tr></tbody></table>, how to do this via c# code?
More info: for example, type "view-source:http://feeds.gawker.com/kotaku/full" in the browser's address bar will give u a xml file, but if you just call "http://feeds.gawker.com/kotaku/full" it will render a html page, what I want is the xml file. hope this is clear.
Here's one way, but it's not really clear what you actually want.
using(var wc = new WebClient())
{
var source = wc.DownloadString("http://google.com");
}
If you mean when rendering your own page. You can get access the the raw page content using a ResponseFilter, or by overriding page render. I would question your motives for doing this though.
Scripts run client-side, so it has no bearing on any c# code.
You can use a tool such as Fiddler to see what is actually being sent over the wire.
disclaimer: I think Fiddler is amazing

Generate PDF from ASP.NET from raw HTML/CSS content?

I'm sending emails that have invoices attached as PDFs. I'm already - elsewhere in the application - creating the invoices in an .aspx page. I'd like to use Server.Execute to return the output HTML and generate a PDF from that. Otherwise, I'd have to use a reporting tool to "draw" the invoice on a PDF. That blows for lots of reasons, not the least of which is that I'd have to update both the .aspx page and the report for every minor change. What to do...
There is no way to generate a PDF from an HTML string directly within .NET, but there are number of third party controls that work well.
I've had success with this one: http://www.html-to-pdf.net
and this: http://www.htmltopdfasp.net
The important questions to ask are:
Does it render correctly as compared to the 3 major browsers: IE, FF and Safari/Chrome?
Does it handle CSS fine?
Does the control have it's own rendering engine? If so, bounce it. You don't want to trust a home grown rendering engine - the browsers have a hard enough problem getting everything pixel perfect.
What dependencies does the third party control require? The fewer, the better.
There are a few others but they deal with ActiveX displays and such.
We use a product called ABCPDF for this and it works fantastic.
http://www.websupergoo.com/abcpdf-1.htm
This sounds like a job for Prince. It can take HTML and CSS and generate a PDF, which you can then present to your users. It supports CSS3 better than most web browsers (staff include HÃ¥kon Wium Lie, the inventor of CSS).
See the samples, especially the ones for Wikipedia pages, for the beautiful output it can generate. There's also an interesting Google Tech Talk with the authors.
Edit: There is a .NET wrapper available.
wkhtmltopdf is a free and cool exe to generate pdf from html. Its written in c++. But nReco htmltopdf is a wrapper dotnet library for this awesome tool. I implemented using this dotnet library and it was just so good it does everything by its own you just need to give html as a data source.
/// <summary>
/// Converts html into PDF using nReco dll and wkhtmltopdf.exe.
/// </summary>
private byte[] ConvertHtmlToPDF()
{
HtmlToPdfConverter nRecohtmltoPdfObj = new HtmlToPdfConverter();
nRecohtmltoPdfObj.Orientation = PageOrientation.Portrait;
nRecohtmltoPdfObj.PageFooterHtml = CreatePDFFooter();
nRecohtmltoPdfObj.CustomWkHtmlArgs = "--margin-top 35 --header-spacing 0 --margin-left 0 --margin-right 0";
return nRecohtmltoPdfObj.GeneratePdf(CreatePDFScript() + ShowHtml() + "</body></html>");
}
The above function is an excerpt from the below link post which explains it in detail.
HTML to PDF in ASP.Net
The initial question is about converting another aspx page containing an invoice to a PDF document. The invoice is probably using some session data and the user suggests to use Server.Execute() to obtain the invoice page HTML code and then to convert that code to PDF. Converting the invoice page URL directly is not possible because a new session would be created during conversion and the session data would be lost.
This is actually a good technique to preserve session data during conversion which is applied in Convert a HTML Page to PDF in Same Session ASP.NET Demo of the EvoPdf library. The complete C# code to get the HTML string rendered by the invoice page and to convert that string to PDF is:
// Execute the invoice page and get the HTML string rendered by this page
TextWriter outTextWriter = new StringWriter();
Server.Execute("Invoice.aspx", outTextWriter);
string htmlStringToConvert = outTextWriter.ToString();
// Create a HTML to PDF converter object with default settings
HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();
// Use the current page URL as base URL
string baseUrl = HttpContext.Current.Request.Url.AbsoluteUri;
// Convert the page HTML string to a PDF document in a memory buffer
byte[] outPdfBuffer = htmlToPdfConverter.ConvertHtml(htmlStringToConvert, baseUrl);
// Send the PDF as response to browser
// Set response content type
Response.AddHeader("Content-Type", "application/pdf");
// Instruct the browser to open the PDF file as an attachment or inline
Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Convert_Page_in_Same_Session.pdf; size={0}", outPdfBuffer.Length.ToString()));
// Write the PDF document buffer to HTTP response
Response.BinaryWrite(outPdfBuffer);
// End the HTTP response and stop the current page processing
Response.End();
As long as you can make sure to use proper XHTML, you could also use a product like Alt-Soft's Xml2PDF to convert XML (XHTML) into PDF by means of XSLT/XSL-FO.
It takes a bit of a learning curve to master, but it works very well once you've "got" it!
Marc
Since you are producing the answer, you can use a tool like Report.NET:
http://sourceforge.net/projects/report/
I disagree with the answers that say you cannot convert directly from output to PDF, however, as you can "re-call" the page and get the HTML as a stream and convert it. I am not sure what tool you would want to use to do this, however. In other words, it is possible, but I am not sure it is worth it. The PDF creation libs, like Report.NET, even though they force reusing some logic and no automagic converrsion, it is easier.
I have not tried this component, but I have heard good things about it from those who have. The model is more like HTML, but I am not sure you can simply send a rendered ASPX to it to create PDF:
http://www.websupergoo.com/abcpdf-8.htm
If you try to find some html to pdf software via GOOGLE you'll get a pile of this stuff.
There are about 10 leaders but most of them use IE dlls in background mode.
Just couple of them use their own parsing engine.
Please try PDF Duo .NET component in your ASP.NET project if you wish to create a PDF programaticaly.
It is light component for a cool generating of PDF invoces, reports e.g.
I'd go a different route. Assuming you are using SQL Server, use SSRS and generate the PDF that way.
A possible minimal solution to use Server.Execute() to obtain the HTML of the invoice page and convert that code to a PDF using winnovative html to pdf api for .net is:
TextWriter outTextWriter = new StringWriter();
Server.Execute("Invoice.aspx", outTextWriter);
HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();
byte[] pdfBytes = htmlToPdfConverter.ConvertHtml(outTextWriter.ToString(),
httpContext.Current.Request.Url.AbsoluteUri);
You can use PDFSharp or iTextSharp to convert html to pdf. PDFSharp is not free.

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