PureBasic

Add an HTML Alternative Body to an Email

Demonstrates the Chilkat Email.AddHtmlAlternativeBody method, which adds an HTML alternative body. Combined with a plain-text body, it produces a multipart/alternative email that offers both representations of the same content. This example sets a plain-text body, adds an HTML alternative, and prints the resulting alternative count.

Background: A well-formed HTML email usually ships two versions of the body: a rich HTML version and a plain-text fallback, wrapped in a multipart/alternative container. The receiving client displays whichever it prefers — modern clients show the HTML, while text-only clients (or spam filters and accessibility tools) use the plain text. Providing both improves deliverability and ensures every recipient can read the message.

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IncludeFile "CkEmail.pb"

Procedure ChilkatExample()

    ;  Demonstrates the AddHtmlAlternativeBody method, which adds an HTML alternative body to
    ;  the email.  Combined with a plain-text body, this produces a multipart/alternative
    ;  email that offers both representations.

    email.i = CkEmail::ckCreate()
    If email.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkEmail::setCkSubject(email, "Plain-text and HTML alternatives")

    ;  Start with a plain-text body.
    CkEmail::ckSetTextBody(email,"This is the plain-text version of the message.","text/plain")

    ;  Add an HTML alternative, creating a multipart/alternative email.
    CkEmail::ckAddHtmlAlternativeBody(email,"<html><body><b>This is the HTML version.</b></body></html>")

    Debug "NumAlternatives = " + Str(CkEmail::ckNumAlternatives(email))


    CkEmail::ckDispose(email)


    ProcedureReturn
EndProcedure