如何使用 WkHTMLToSharp / wkhtmltopdf 将 HTML 文件转换为 PDF 和 C# 中的图像

Question

I am generating HTML files on the fly, and I would like to create a PDF from the final file.我正在动态生成 HTML 文件，并且我想从最终文件中创建 PDF。 I am using the following to generate the HTML file:我正在使用以下内容生成 HTML 文件：

    public static void WriteHTML(string cFile, List<Movie> mList)
    {
        int lineID = 0;
        string strHeader, strMovie, strGenre, tmpGenre = null;

        string strPDF = null;

        // initiates streamwriter for catalog output file
        FileStream fs = new FileStream(cFile, FileMode.Create);
        StreamWriter catalog = new StreamWriter(fs);

        strHeader = "<style type=\"text/css\">\r\n" + "<!--\r\n" + "tr#odd {\r\n" + "   background-color:#e2e2e2;\r\n" + "  vertical-align:top;\r\n" + "}\r\n" + "\r\n" + "tr#even {\r\n" + "   vertical-align:top;\r\n" + "}\r\n" + "div#title {\r\n" + "  font-size:16px;\r\n" + "    font-weight:bold;\r\n" + "}\r\n" + "\r\n" + "div#mpaa {\r\n" + "    font-size:10px;\r\n" + "}\r\n" + "\r\n" + "div#genre {\r\n" + " font-size:12px;\r\n" + "    font-style:italic;\r\n" + "}\r\n" + "\r\n" + "div#plot {\r\n" + "   height: 63px;\r\n" + "  font-size:12px;\r\n" + "    overflow:hidden;\r\n" + "}\r\n" + "-->\r\n" + "</style>\r\n" + "\r\n" + "<html>\r\n" + "    <body>\r\n" + "     <table>\r\n";
        catalog.WriteLine(strHeader);
        strPDF = strHeader;

        foreach (Movie m in mList)
        {
            tmpGenre = null;

            strMovie = lineID == 0 ? "          <tr id=\"odd\" style=\"page-break-inside:avoid\">\r\n" : "          <tr id=\"even\" style=\"page-break-inside:avoid\">\r\n";
            catalog.WriteLine(strMovie);
            strPDF += strMovie;

            foreach (string genre in m.Genres)
                tmpGenre += ", <a href=\"" + genre + ".html\" target=\"_blank\">" + genre + "</a>";
            strGenre = tmpGenre != null ? tmpGenre.Substring(2) : null;

            strMovie = "                <td>\r\n" + "                   <img src=\".\\images\\" + m.ImageFile + "\" width=\"75\" height=\"110\">\r\n" + "               </td>\r\n" + "              <td>\r\n" + "                   <div id=\"title\">" + m.Title + "</div>\r\n" + "                    <div id=\"mpaa\">" + m.Certification + " " + m.MPAA + "</div>\r\n" + "                  <div id=\"genre\">" + strGenre + "</div>\r\n" + "                   <div id=\"plot\">" + m.Plot + "</div>\r\n" + "              </td>\r\n" + "          </tr>\r\n";
            catalog.WriteLine(strMovie);
            strPDF += strMovie;
            lineID = lineID == 0 ? 1 : 0;
        }

        string closingHTML = "      </table>\r\n" + "   </body>\r\n" + "</html>";
        catalog.WriteLine(closingHTML);
        strPDF += closingHTML;
        WritePDF(strPDF, cFile + ".PDF");
        catalog.Close();
    }

Once completed, I want to call the following function to generate the PDF file:完成后，我想调用下面的 function 来生成 PDF 文件：

public static void WritePDF(string cFile, string pdfFile)
{
    WkHtmlToPdfConverter w = new WkHtmlToPdfConverter();

    byte[] strHTML = w.Convert(cFile);
    File.WriteAllBytes(pdfFile, strHTML);
    w.Dispose();
}

I've discovered that the.Convert function will convert HTML code to PDF, not a file.我发现.Convert function 会将 HTML 代码转换为 PDF，而不是文件。 Secondly, when I pass in the HTML code directly, the images are not appearing in the PDF.其次，当我直接传入 HTML 代码时，图像没有出现在 PDF 中。 I know there is an issue with.GIF files, but these are all.JPG files.我知道 .GIF 文件有问题，但这些都是 .JPG 文件。

I've read a lot about how good wkhtmltopdf is, and the guy who wrote WkHTMLToSharp posted his project all over SO, but I've been disappointed by the lack of documentation for it.我已经阅读了很多关于 wkhtmltopdf 有多好的文章，并且编写 WkHTMLToSharp 的人在 SO 上发布了他的项目，但我对缺乏文档感到失望。

I WANT to be able to pass in a file to convert, change the margins (I know this is possible, I just need to figure out the correct settings), have it convert images correctly, and most importantly, to not break up my items across multiple pages (support "page-break-inside:avoid" or something similar).我希望能够传入要转换的文件，更改边距（我知道这是可能的，我只需要找出正确的设置），让它正确转换图像，最重要的是，不要分解我的项目跨多个页面（支持“page-break-inside:avoid”或类似的东西）。

I'd love to see how others are using this!我很想看看其他人是如何使用它的！

Answer 1

I have coded an example about how to create a PDF from HTML.我编写了一个关于如何从 HTML 创建 PDF 的示例。 I just updated it to also print images.我刚刚更新它以打印图像。

https://github.com/hmadrigal/playground-dotnet/tree/master/MsDotNet.PdfGeneration https://github.com/hmadrigal/playground-dotnet/tree/master/MsDotNet.PdfGeneration

(In my blog post I explain most of the project https://hmadrigal.wordpress.com/2015/10/16/creating-pdf-reports-from-html-using-dotliquid-markup-for-templates-and-wkhtmltoxsharp-for-printing-pdf/ ) （在我的博客文章中，我解释了大部分项目https://hmadrigal.wordpress.com/2015/10/16/creating-pdf-reports-from-html-using-dotliquid-markup-for-templates-and-wkhtmltox -for-printing-pdf/ )

Pretty much you have two options:几乎你有两个选择：

1: Using file:// and the fullpath to the file. 1：使用 file:// 和文件的完整路径。

<img alt="profile" src="{{ employee.PorfileFileName | Prepend: "Assets\ProfileImage\" | ToLocalPath  }}" />

2: Using URL Data ( https://en.wikipedia.org/wiki/Data_URI_scheme ) 2：使用 URL 数据（ https://en.wikipedia.org/wiki/Data_URI_scheme ）

<img alt="profile" src="data:image/png;base64,{{ employee.PorfileFileName | Prepend: "Assets\ProfileImage\" | ToLocalPath | ToBase64 }}" />

Cheers, Herb干杯，香草

Answer 2

Use WkHtmlToXSharp.使用 WkHtmlToXSharp。

Download the latest DLL from Github从 Github 下载最新的 DLL

public static string ConvertHTMLtoPDF(string htmlFullPath, string pageSize, string orientation)
{
   string pdfUrl = htmlFullPath.Replace(".html", ".pdf");

   try
   {
       #region USING WkHtmlToXSharp.dll
       //IHtmlToPdfConverter converter = new WkHtmlToPdfConverter();
       IHtmlToPdfConverter converter = new MultiplexingConverter();

       converter.GlobalSettings.Margin.Top = "0cm";
       converter.GlobalSettings.Margin.Bottom = "0cm";
       converter.GlobalSettings.Margin.Left = "0cm";
       converter.GlobalSettings.Margin.Right = "0cm";
       converter.GlobalSettings.Orientation = (PdfOrientation)Enum.Parse(typeof(PdfOrientation), orientation);
       if (!string.IsNullOrEmpty(pageSize))
           converter.GlobalSettings.Size.PageSize = (PdfPageSize)Enum.Parse(typeof(PdfPageSize), pageSize);

       converter.ObjectSettings.Page = htmlFullPath;
       converter.ObjectSettings.Web.EnablePlugins = true;
       converter.ObjectSettings.Web.EnableJavascript = true;
       converter.ObjectSettings.Web.Background = true;
       converter.ObjectSettings.Web.LoadImages = true;
       converter.ObjectSettings.Load.LoadErrorHandling = LoadErrorHandlingType.ignore;

       Byte[] bufferPDF = converter.Convert();

       System.IO.File.WriteAllBytes(pdfUrl, bufferPDF);

       converter.Dispose();

       #endregion
   }
   catch (Exception ex)
   {
       throw new Exception(ex.Message, ex);
   }

   return pdfUrl;
}

Answer 3

You can use Spire.Pdf to do so.您可以使用 Spire.Pdf 来执行此操作。

This component could convert html to pdf.该组件可以将 html 转换为 pdf。

 PdfDocument pdfdoc = new PdfDocument();
 pdfdoc.LoadFromHTML(fileFullName, true, true, true);
 //String url = "http://www.e-iceblue.com/";
 //pdfdoc.LoadFromHTML(url, false, true, true);
 pdfdoc.SaveToFile("FromHTML.pdf");

Answer 4

We're also using wkhtmltopdf and are able to render images correctly.我们还使用 wkhtmltopdf 并且能够正确渲染图像。 However, by default the rendering of images is disabled.但是，默认情况下禁用图像渲染。

You have to specify those options on your converter instance:您必须在转换器实例上指定这些选项：

var wk = _GetConverter()
wk.GlobalSettings.Margin.Top = "20mm";
wk.GlobalSettings.Margin.Bottom = "10mm";
wk.GlobalSettings.Margin.Left = "10mm";
wk.GlobalSettings.Margin.Right = "10mm";
wk.GlobalSettings.Size.PaperSize = PdfPaperSize.A4;
wk.ObjectSettings.Web.PrintMediaType = true;
wk.ObjectSettings.Web.LoadImages = true;
wk.ObjectSettings.Web.EnablePlugins = false;
wk.ObjectSettings.Web.EnableJavascript = true;

result = wk.Convert(htmlContent);

如何使用 WkHTMLToSharp / wkhtmltopdf 将 HTML 文件转换为 PDF 和 C# 中的图像

问题描述

4 个解决方案

解决方案1
1 2016-12-20 16:40:34

解决方案2
0 已采纳 2013-10-31 03:58:59

解决方案3
0 2011-07-18 02:25:20

解决方案4
0 2011-08-05 15:08:21

如何使用 WkHTMLToSharp / wkhtmltopdf 将 HTML 文件转换为 PDF 和 C# 中的图像

问题描述

4 个解决方案

解决方案1 1 2016-12-20 16:40:34

解决方案2 0 已采纳 2013-10-31 03:58:59

解决方案3 0 2011-07-18 02:25:20

解决方案4 0 2011-08-05 15:08:21

解决方案1
1 2016-12-20 16:40:34

解决方案2
0 已采纳 2013-10-31 03:58:59

解决方案3
0 2011-07-18 02:25:20

解决方案4
0 2011-08-05 15:08:21