Base64 字符串编码图像未加载到输出 PDF (TuesPechkin / Wkhtmltopdf)

Question

公平警告：这个 post 是一个有点像论文大小的问题...所以让我先向所有经历过并试图回答它的人表示感谢。

上下文：
我一直在尝试我能找到的仅有的 2 个免费商业用途开源 html 到 pdf 转换库。

不幸的是，PDFSharp 输出的 pdf 格式布局完全混乱，不符合输入格式 HTML，有时无法正确输出图像。 (如何should've look vs how it looks with PDF#)
另一方面，TuesPechkin（wkhtmltopdf c# 包装器库）除了只输出这些 odd "image containers" (a hollow outline of where the image supposedly should be).

之外一切正常我在调用 class' 构造函数时声明 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。
我将这个输出和插入我自己的 "formatted header with some of the email's info" 类型，同时在每次出现图像时切换图像的 CID，使用以下使用 MailKit/MimeKit 工具的代码：

...
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”是我的 MimeMessage。

下面是整个建串过程，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objective是为了修复输出的PDF文件中这些空心图像容器的奇数输出。

编辑：这是一个 HTML 字符串的示例，在它被发送到“Convert2PDF”方法之前直接从调试器中获取：

<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; ">&ensp;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; ">&nbsp;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;">&nbsp;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;">&nbsp;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;">&nbsp;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);">
<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&nbsp; &nbsp;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测试这些 HTML 字符串，确保它们的格式和图像正确显示：https://www.onlinehtmleditor.net/

Answer 1

我使用 NuGet 包 itext7.pdfhtml 测试了您的 HTML，图像也没有显示。但是经过一些调查，我发现 src 属性.

中的值存在问题

在 src 属性值中你有 data:image/png;Base64。它应该是 data:image/png;base64 - 注意 base64.

的小写 b

将 Base64 更改为 base64 后似乎有效。

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