公平警告：这篇文章有点像一篇文章大小的问题......所以让我提前感谢那些通过它并试图回答它的人。
背景：
我一直在尝试我能找到的唯一 2 个免费商业使用的开源 html 到 pdf 转换库。
不幸的是，PDFSharp 输出的 pdf 样式布局完全凌乱，不尊重输入 HTML 的格式，有时也无法正确输出图像。（它应该看起来如何与 PDF# 看起来如何）
另一方面，TuesPechkin（wkhtmltopdf c# 包装器库）除了只输出这些奇怪的“图像容器” （图像应该应该在哪里的空心轮廓）之外，一切都很好是）。
我在调用我的类的构造函数时声明了 IConverter 对象，如下所示：
converter = new ThreadSafeConverter( new RemotingToolset<PdfToolset>( new Win64EmbeddedDeployment( new TempFolderDeployment())));
然后我有以下方法，您可以在其中找到我当前用于转换的 GlobalSettings 和 ObjectSettings。
/// <summary>
/// Method for converting an .EML's HTML Body to a PDF
/// </summary>
/// <param name="html">The HTML to be converted</param>
/// <param name="usern">Optional: Username for file naming</param>
/// <param name="idx">Optional: Index for file naming</param>
public void Convert2PDF(string html, string usern = null, int? idx = null)
{
string userName = usern ?? "test";
var document = new HtmlToPdfDocument
{
GlobalSettings =
{
ProduceOutline = true,
DocumentTitle = userName.Split('@')[0] + "__" + idx.Value.ToString(),
PaperSize = PaperKind.A4,
Margins =
{
Left = 6,
Top = 4,
Right = 6,
Bottom = 8,
Unit = Unit.Millimeters
},
UseCompression = false
},
Objects =
{
new ObjectSettings { HtmlText = html,
WebSettings = new WebSettings
{
EnableIntelligentShrinking = false,
DefaultEncoding = "UTF-8",
LoadImages = true,
PrintBackground = true,
},
FooterSettings = new FooterSettings{CenterText = "[page]"},
}
}
};
byte[] bolb = converter.Convert(document);
File.WriteAllBytes(Path.Combine(mailBoxDirPath, ".PDFs", userName.Split('@')[0] + "__" + idx.Value.ToString() + "__with_TuesPechkin__" + ".pdf"), bolb);
/* ↑ TuesPechkin */
/* ↓ PdfSharp */
byte[] blob = null;
using(MemoryStream ms = new MemoryStream())
{
PdfDocument pdf = PdfGenerator.GeneratePdf(html,PageSize.A4,/*margin from border to content ==*/ 0);
pdf.Save(ms);
blob = ms.ToArray();
}
userName = usern ?? "test";
File.WriteAllBytes(Path.Combine(mailBoxDirPath, ".PDFs", userName.Split('@')[0] + "__" + idx.Value.ToString() + "__with_PDF#__" + ".pdf"), blob);
}
这个“HTML”字符串是从我正在使用的另一个名为“MailKit/MimeKit”的库的输出中获得的，该库由“Jstedfast”制作。
我采用此输出并插入我自己的“带有一些电子邮件信息的格式化标题”，同时每次有一个图像的 CID 时也会切换，使用 MailKit/MimeKit 工具的以下代码：
...
foreach (MimePart part in temp.BodyParts)
{
if (!part.IsAttachment && part.ContentId != null)
{
using (Stream stream = new MemoryStream())
{
part.Content.WriteTo(stream);
stream.Flush();
stream.Seek(0, SeekOrigin.Begin);
using (StreamReader sr = new StreamReader(stream))
{
string cid = string.Format("src=\"cid:{0}", part.ContentId);
string data = string.Format("src=\"data:{0}/{1};{2},\n{3}", part.ContentType.MediaType, part.ContentType.MediaSubtype, part.ContentTransferEncoding, sr.ReadToEnd());
rValue.Replace(cid, data);
}
}
}
}
...
旁注：“temp”将是我的 MimeMessage。
这将是整个字符串构建过程以供参考。我通常在 HTML 预览器上测试这些输出，它们在格式或图像显示方面没有任何问题，所以我知道问题不是我在尝试转换为 PDF 时的 HTML 输入：
...
MimeMessage temp = emp.Pop3.GetMessage(idx);
StringBuilder rValue = new StringBuilder(null);
Regex bodyTag = new Regex(@"^<body.*>$");
Regex charset = new Regex("charset=(.*)\"");
string body = string.Empty, condHelper = string.Empty;
List<string> tempBody = temp.HtmlBody.Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries).ToList<string>();
int tempidx = 0;
foreach (string line in tempBody) // Looks-up this HTML's charset and sets it to utf-8
{
if(charset.IsMatch(line))
{
condHelper = charset.Match(line).Value;
tempidx = tempBody.IndexOf(line);
tempBody[tempidx] = line.Replace(condHelper, "charset=utf-8\"");
break;
}
}
foreach(string line in tempBody) //Looks up the index of the body tag so I append that "custom header" with basic info from the email
{
if (bodyTag.IsMatch(line))
{
tempidx = tempBody.IndexOf(line);
break;
}
}
string line4change = tempBody[tempidx];
line4change += emp.HeaderBuilder(temp.Subject, temp.From.Mailboxes.First(), temp.To.Mailboxes.ToList<MailboxAddress>(), temp.Date.DateTime, temp.Cc.Mailboxes.ToList<MailboxAddress>());
tempBody[tempidx] = line4change;
for (int i = 0; i < tempBody.Count; i++) // starts building the final version of the whole html string
body += tempBody[i] + Environment.NewLine;
rValue.Append(body);
foreach (MimePart part in temp.BodyParts)
{
if (!part.IsAttachment && part.ContentId != null)
{
using (Stream stream = new MemoryStream())
{
part.Content.WriteTo(stream);
stream.Flush();
stream.Seek(0, SeekOrigin.Begin);
using (StreamReader sr = new StreamReader(stream))
{
string cid = string.Format("src=\"cid:{0}", part.ContentId);
string data = string.Format("src=\"data:{0}/{1};{2},\n{3}", part.ContentType.MediaType, part.ContentType.MediaSubtype, part.ContentTransferEncoding, sr.ReadToEnd());
rValue.Replace(cid, data);
}
}
}
}
try
{
emp.Convert2PDF(rValue.ToString(), emp.User, idx);
}
catch { }
...
所以，我的目标是在输出的 PDF 文件上修复这些空心图像容器的奇数输出。
编辑：这是一个在发送到“Convert2PDF”方法之前直接从调试器获取的 HTML 字符串示例：
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="margin-top:24px;"></div>
<span style="font-family: Segoe UI; font-size: 16; font-weight: bold; "> t est</span><br>
<span><hr style="height: 4px; border: none; margin-top: 2px; margin-bottom: 12px; color:#000; background-color:#000;" /></span>
<table style="margin-bottom:32px; " cellspacing="0" cellpadding="4">
<tr>
<td style="margin-left: auto; padding-right: 128px; white-space: nowrap;"><span style="font-family: Segoe UI; font-size: 14; font-weight: bold; "> From:</span></td>
<td style="white-space: nowrap;"><span style="font-family:Segoe UI; font-size: 14;">tester[REDACTED]@outlook.com</span></td>
<td style="width:99%; "></td>
</tr>
<tr style="background-color:#f2f2f2;">
<td style="margin-left: auto; padding-right: 128px; white-space: nowrap;"><span style="font-family:Segoe UI; font-size: 14; font-weight: bold;"> Sent:</span></td>
<td style="white-space: nowrap;"><span style="font-family:Segoe UI; font-size: 14; ">Monday, 11th of October 2021, 08:52:49</span></td>
<td style="width:99%; "></td>
</tr>
<tr>
<td style="margin-left: auto; padding-right: 128px; white-space: nowrap;"><span style="font-family:Segoe UI; font-size: 14; font-weight: bold;"> To:</span></td>
<td style="white-space: nowrap;"><span style="font-family:Segoe UI; font-size: 14;">[REDACTED]</span></td>
<td style="width:99%; "></td>
</tr>
<tr style="background-color:#f2f2f2;">
<td style="margin-left: auto; padding-right: 128px; white-space: nowrap;"><span style="font-family:Segoe UI; font-size: 14; font-weight: bold;"> Subject:</span></td>
<td style="white-space: nowrap;"><span style="font-family:Segoe UI; font-size: 14;">Testing TuesPechkin Library w/Images</span></td>
<td style="width:99%; "></td>
</tr>
</table>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
1st Inline image:</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<img style="width: 187px; height: 221px; max-width: 100%;" size="7198" contenttype="image/png" width="187" height="221" alt="key points of an email" data-outlook-trace="F:1|T:1" src="data:image/png;Base64,
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</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
2nd Inline image:</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
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"><br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
Stylized text:</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<span style="font-family: Georgia, serif; color: rgb(179, 106, 226);"><b><i><u><strike>S o m e T e x t</strike></u></i></b></span><br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<span style="font-family: Georgia, serif; color: rgb(179, 106, 226);"><b><i><u><strike><br>
</strike></u></i></b></span></div>
</body>
</html>
我一直在使用以下站点来测试这些 HTML 字符串，以确保它们的格式和图像正确显示：https ://www.onlinehtmleditor.net/