Fair warning: This post is a bit of an essay-sized question... So let me say my thanks beforehand to whoever goes through it and tries to answer it.
Context:
I have been trying the only 2 free-commercial-use open-source html to pdf converting libraries I could find.
PDFSharp unfortunately outputs a pdf with a completely messy style layout that doesn't respect the formatting of the input HTML and sometimes doesn't output images properly. (How it should've look vs how it looks with PDF#)
TuesPechkin (wkhtmltopdf c# wrapper library) on the other hand does it all right except for only outputting these odd "image containers" (a hollow outline of where the image supposedly should be).
I declare the IConverter object upon calling my class' constructor like so:
converter = new ThreadSafeConverter( new RemotingToolset<PdfToolset>( new Win64EmbeddedDeployment( new TempFolderDeployment())));
Then I have the following method where you can find the GlobalSettings and ObjectSettings I'm currently using for the conversion.
/// <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);
}
This "HTML" string is obtained from the output of another library I'm using called "MailKit/MimeKit" made by "Jstedfast".
I take this output and insert my own kind of "formatted header with some of the email's info" while also switching the image's CID every time there's one, with the following code that uses MailKit/MimeKit's tools:
...
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);
}
}
}
}
...
Side note: "temp" would be my MimeMessage.
And here would be the whole string-building process for reference. I usually test these outputs on HTML previewers, and they come out without any issues in formatting or image display, so I know the issue isn't my HTML input when trying to convert to PDF:
...
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 { }
...
So, my objective is to fix the odd output of these hollow image containers on the outputted PDF file.
Edit: Here's an example of an HTML string taken directly from the debugger right before it gets sent to the "Convert2PDF" method:
<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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"><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);">
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);">
<img style="width: 100px; height: 100px; max-width: 100%;" size="967" contenttype="image/png" width="100" height="100" alt="2 dradients" data-outlook-trace="F:1|T:1" src="data:image/png;Base64,
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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>
I have been using the following site to test these HTML strings making sure their formatting and images are displaying correctly: https://www.onlinehtmleditor.net/
I tested your HTML using NuGet package
itext7.pdfhtmland the images didn't show either. However after some investigation, I discovered an issue with the value in thesrcproperty.In the
srcproperty value you havedata:image/png;Base64. It should bedata:image/png;base64- notice the lower-casebforbase64.After changing
Base64tobase64it seems to work.