Xojo Plugin

Add a Related String Resource to an Email

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Demonstrates the Chilkat Email.AddRelatedString method, which adds a text-based related MIME resource, such as a style sheet, from an in-memory string and returns the generated Content-ID. The first argument is the MIME resource name, the second is the text content, and the third is the charset used to encode it. Because the Content-ID is generated by the call, this example adds the style sheet first, then builds an HTML body in a StringBuilder that references the style sheet by that cid:, and passes the result to SetHtmlBody.

Background: Related items are not always images loaded from disk — sometimes the resource is text you already have in memory, like a generated CSS style sheet or an SVG. AddRelatedString lets you embed such content directly without writing a temporary file first. As with other related items, it lives in the multipart/related enclosure and is referenced from the HTML by the Content-ID the method returns.

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//  Demonstrates the AddRelatedString method, which adds a text-based related MIME resource
//  (such as a style sheet) from an in-memory string and returns the generated Content-ID.
//  The first argument is the resource name, the second is the text content, the third is the charset.

Dim email As New Chilkat.Email
email.Subject = "Email with a related style sheet"

//  Add the text-based related resource first; capture the generated Content-ID.
Dim cid As String
cid = email.AddRelatedString("styles.css","body { color: navy; }","utf-8")
If (email.LastMethodSuccess = False) Then
    System.DebugLog(email.LastErrorText)
    Return
End If

//  Build the HTML body, referencing the related style sheet by its Content-ID.  A
//  placeholder is used and then replaced with the actual Content-ID.
Dim sbHtml As New Chilkat.StringBuilder
Dim success As Boolean
success = sbHtml.Append("<html><head><link rel=""stylesheet"" href=""cid:PLACEHOLDER_CID""/></head><body>Styled content.</body></html>")
Dim numReplaced As Int32
numReplaced = sbHtml.Replace("PLACEHOLDER_CID",cid)
email.SetHtmlBody sbHtml.GetAsString()

System.DebugLog("Related Content-ID = " + cid)
System.DebugLog("NumRelatedItems = " + Str(email.NumRelatedItems))