Xbase++

Add a Related String Resource to an Email

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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LOCAL oEmail
LOCAL cCid
LOCAL oSbHtml
LOCAL nNumReplaced

//  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.

oEmail := CreateObject("Chilkat.Email")
oEmail:Subject := "Email with a related style sheet"

//  Add the text-based related resource first; capture the generated Content-ID.
cCid := oEmail:AddRelatedString("styles.css", "body { color: navy; }", "utf-8")
IF (oEmail:LastMethodSuccess == 0)
    ? oEmail:LastErrorText
    oEmail:destroy()
    RETURN
ENDIF

//  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.
oSbHtml := CreateObject("Chilkat.StringBuilder")
oSbHtml:Append('<html><head><link rel="stylesheet" href="cid:PLACEHOLDER_CID"/></head><body>Styled content.</body></html>')
nNumReplaced := oSbHtml:Replace("PLACEHOLDER_CID", cCid)
oEmail:SetHtmlBody(oSbHtml:GetAsString())

? "Related Content-ID = " + cCid
? "NumRelatedItems = " + Str(oEmail:NumRelatedItems)

oEmail:destroy()
oSbHtml:destroy()