如何在c#中使用WkHTMLToSharp / wkhtmltopdf将HTML文件转换为PDF
本文关键字：HTML wkhtmltopdf 文件 转换 PDF WkHTMLToSharp | 更新日期: 2023-09-27 18:02:43
我正在动态生成HTML文件，我想从最终文件创建一个PDF。我使用以下代码生成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();
}
完成后，我想调用以下函数来生成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();
}
我发现。convert函数将HTML代码转换为PDF，而不是文件。其次，当我直接传入HTML代码时，图像不会出现在PDF中。我知道gif文件有问题，但这些都是jpg文件。
我读了很多关于wkhtmltopdf有多好，写WkHTMLToSharp的家伙在SO上发布了他的项目，但我对缺乏相关文档感到失望。
我希望能够传递一个文件转换，改变边距(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，不要打破我的项目跨多个页面(支持"page-break-inside:avoid"或类似的东西)。
我很想看看其他人是如何使用它的!
我已经编写了一个关于如何从HTML创建PDF的示例。我刚刚更新了它，也可以打印图像。
https://github.com/hmadrigal/playground-dotnet/tree/master/MsDotNet.PdfGeneration(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-wkhtmltoxsharp-for-printing-pdf/)
基本上你有两个选择:
1:使用file://和文件的全路径。
<img alt="profile" src="{{ employee.PorfileFileName | Prepend: "Assets'ProfileImage'" | ToLocalPath }}" />
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 }}" />
欢呼,草
使用WkHtmlToXSharp.
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;
}
你可以使用Spire.Pdf。
此组件可以将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");
我们也使用wkhtmltopdf并且能够正确渲染图像。但是，默认情况下，图像渲染是禁用的。
您必须在您的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);