Add Image to HTML Email

Demonstrates how to add an image to an HTML email.
Chilkat C# Downloads

bool success = false;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

Chilkat.Email email = new Chilkat.Email();

email.From = "Matt <matt@example.com>";
email.AddTo("Joe","joe@example.com");
email.Subject = "This is a test";

//  Add an HTML body with an image tag.
string html = "<html><body><p>Test with image:</p><p><img src=\"/wildlife/starfish.jpg\" /></p></body></html>";
email.SetHtmlBody(html);

//  Add the image data from a file.  The pathInHtml must match the value of the img tag's src attribute.
string pathInHtml = "/wildlife/starfish.jpg";
//  The actual path of the JPG file in the local filesystem:
string pathOnDisk = "qa_data/jpg/starfish20.jpg";

success = email.AddRelatedFile2(pathOnDisk,pathInHtml);
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

//  The email is now properly constructed with an image that will be visible in the HTML.
//  In this example, we'll save it to a .eml file and verify by loading the .eml in an email client such as Mozilla Thunderbird.

success = email.SaveEml("qa_output/starfish.eml");

//  Also, we can examine the MIME to understand how the image data in the MIME is associated with the img tag in the HTML.
//  It is the Content-Location header value that must match the value of the img tag's src attribute.

Debug.WriteLine(email.GetMime());

//  Here's the MIME:

//  MIME-Version: 1.0
//  Date: Thu, 26 May 2022 11:09:12 -0500
//  Message-ID: <B1D499F74F533E287BFE04BBD79AAF1D973B61E3@SLICE>
//  Content-Type: multipart/related; boundary="------------000205040704010904010706"
//  X-Priority: 3 (Normal)
//  From: Matt <matt@example.com>
//  To: Joe <joe@example.com>
//  Subject: This is a test
//  
//  --------------000205040704010904010706
//  Content-Type: text/html; charset=us-ascii
//  Content-Transfer-Encoding: 7bit
//  
//  <html><body><p>Test with image:</p><p><img src="/wildlife/starfish.jpg" /></p></body></html>
//  --------------000205040704010904010706
//  Content-Type: image/jpeg; name="/wildlife/starfish.jpg"
//  Content-Transfer-Encoding: base64
//  Content-Disposition: inline; filename="/wildlife/starfish.jpg"
//  Content-Location: /wildlife/starfish.jpg
//  
//  /9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcD8g
//  NC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBEV0U3OFBtUVdf
//  YmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj
//  Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/EABcAAAMBAAAA
//  AAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQACEAMQAAAB2kZY
//  NNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgBAQABBQL0XqN+
//  pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgBAwEBPwHqU5aq
//  Axx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIBAT8B3Bhqy7Zc
//  enyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEBAAY/ArZyn+Cg
//  xtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEAAT8hkEwPUUR9
//  DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAAAAAAAAAAAAAA
//  AAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAAAAAAAAAAAREA
//  QRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAAAAABEQAhMUFx
//  EFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO/n//2Q==
//  
//  --------------000205040704010904010706--