.NET Wrapper for WkHtmlToPdf DLL, library that uses Webkit engine to convert HTML pages to PDF.
Q: Why produced PDF lacks background images and colors?
A: By default, all backgrounds will be ommited from the document.
You can override this setting by calling
SetPrintBackground(true) on the
ObjectConfig supplied with the HTML document to the
Convert() method of the converter.
Q: Do I need to run wkhtmltox installer on the machine for the library to work?
A: No, latest version of wkhtmltox DLL is included in the project (and in NuGet package) along with its dependencies, and copied into build folder on project build.
So there's no need to install any prerequisites before using the library on the computer.
Q: How to build library from the code?
A: To build the library from the code, you'll need Visual Studio 2010 with NuGet package manager installed. Then, after checking out the code and opening it in VS you should restore NuGet packages: right click on the solution, select Manage NuGet Packages... and in the opened window you should see notification that some packages are missing with the button that restores them.
Alternatively you can run
nuget install packages.config
for every project in the solution. (Two test projects with xunit, others supporting Common.Logging.)
And then you should be able to build everything with Build > Build Solution menu item.
Q: Why my Web App hangs on the "easy to use" code example below?
A: In Web applications new thread is typically created for each request processed.
SimplePechkin is designed to work only within one thread, even if you create another object for every thread, so you should use
SynchronizedPechkin instead. Just install another NuGet package and change every occurence of
SynchronizedPechkin, that's it.
I will implement detection of multiple thread use of
SimplePechkin in the future and there will be exception thrown in that case.
Q: Why my Web App hangs/crashes even after I've started using
A: It's because of how deploying to the IIS works: on redeploy server process doesn't stop and the native wkhtmltopdf dll stays in the memory, but everything managed is destroyed, including the only thread that this DLL can be used by.
Possible workaround is to set the property
Copy To Output Directory for all
.dll files in Pechkin (NuGet package adds them to the root of your project) to
Copy If Newer. Otherwise it's an unresolved issue.
Pechkin is available in NuGet repo: in most cases you should use SynchronizedPechkin as it protects multithreaded code from crashing the lib. But for simple usage from one thread, you can use SimplePechkin directly.
Pechkin is both easy to use
byte pdfBuf = new SimplePechkin(new GlobalConfig()).Convert("<html><body><h1>Hello world!</h1></body></html>");
// create global configuration object GlobalConfig gc = new GlobalConfig(); // set it up using fluent notation gc.SetMargins(new Margins(300, 100, 150, 100)) .SetDocumentTitle("Test document") .SetPaperSize(PaperKind.Letter); //... etc // create converter IPechkin pechkin = new SynchronizedPechkin(gc); // subscribe to events pechkin.Begin += OnBegin; pechkin.Error += OnError; pechkin.Warning += OnWarning; pechkin.PhaseChanged += OnPhase; pechkin.ProgressChanged += OnProgress; pechkin.Finished += OnFinished; // create document configuration object ObjectConfig oc = new ObjectConfig(); // and set it up using fluent notation too oc.SetCreateExternalLinks(false) .SetFallbackEncoding(Encoding.ASCII) .SetLoadImages(false) .SetPageUri("http://google.com"); //... etc // convert document byte pdfBuf = pechkin.Convert(oc);
Copyright 2012 by Slava Kolobaev. This work is made available under the terms of the Creative Commons Attribution 3.0 license, http://creativecommons.org/licenses/by/3.0/