RndUsr0.DinkToPdf 1.0.9-20190207.1

DinkToPdf

.NET Core P/Invoke wrapper for wkhtmltopdf library that uses Webkit engine to convert HTML pages to PDF.

Forked from the original project by Rok Dvojmoč, with updates to:

• Upgrade to .NET Standard 2.0, .NET Core 2.1, wkhtmltopdf v0.12.5.
• Fix the sporadic 'A callback was made on a garbage collected delegate' bug.

Install

Library can be installed through Nuget. Run command bellow from the package manager console:

PM> Install-Package RndUsr0.DinkToPdf

Copy native library to root folder of your project. From there .NET Core loads native library when native method is called with P/Invoke. You can find latest version of native library here. Select appropriate library for your OS and platform (64 or 32 bit).

IMPORTANT

Library was NOT tested with IIS. Library was tested in console applications and with Kestrel web server both for Web Application and Web API .

Basic converter

Use this converter in single threaded applications.

Create converter:

var converter = new BasicConverter(new PdfTools());

Synchronized converter

Use this converter in multi threaded applications and web servers. Conversion tasks are saved to blocking collection and executed on a single thread.

var converter = new SynchronizedConverter(new PdfTools());

Define document to convert

var doc = new HtmlToPdfDocument()
{
    GlobalSettings = {
        ColorMode = ColorMode.Color,
        Orientation = Orientation.Landscape,
        PaperSize = PaperKind.A4Plus,
    },
    Objects = {
        new ObjectSettings() {
            PagesCount = true,
            HtmlContent = @"Lorem ipsum dolor sit amet, consectetur adipiscing elit. In consectetur mauris eget ultrices  iaculis. Ut                               odio viverra, molestie lectus nec, venenatis turpis.",
            WebSettings = { DefaultEncoding = "utf-8" },
            HeaderSettings = { FontSize = 9, Right = "Page [page] of [toPage]", Line = true, Spacing = 2.812 }
        }
    }
};

Convert

If Out property is empty string (defined in GlobalSettings) result is saved in byte array.

byte[] pdf = converter.Convert(doc);

If Out property is defined in document then file is saved to disk:

var doc = new HtmlToPdfDocument()
{
    GlobalSettings = {
        ColorMode = ColorMode.Color,
        Orientation = Orientation.Portrait,
        PaperSize = PaperKind.A4,
        Margins = new MarginSettings() { Top = 10 },
        Out = @"C:\DinkToPdf\src\DinkToPdf.TestThreadSafe\test.pdf",
    },
    Objects = {
        new ObjectSettings()
        {
            Page = "http://google.com/",
        },
    }
};

converter.Convert(doc);

Dependency injection

Converter must be registered as singleton.

public void ConfigureServices(IServiceCollection services)
{
    // Add converter to DI
    services.AddSingleton(typeof(IConverter), new SynchronizedConverter(new PdfTools()));
}