PureBasic

Create a multipart/alternative MIME Entity

Demonstrates the Chilkat Mime.NewMultipartAlternative method, which initializes the object as an empty multipart/alternative entity. It takes no arguments; the alternative representations are then appended.

Background: multipart/alternative holds several renderings of the same content and lets the client pick the best one it can display — the standard way to send an email as both plain text and HTML. Order matters: parts go from least to most preferred, so the plain-text version comes first and the HTML last, and a client shows the last one it understands.

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IncludeFile "CkMime.pb"

Procedure ChilkatExample()

    success.i = 0

    ;  Demonstrates the Mime.NewMultipartAlternative method, which initializes the object as an empty
    ;  multipart/alternative entity, clearing any existing content.  It takes no arguments.

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

    success = CkMime::ckNewMultipartAlternative(mime)
    If success = 0
        Debug CkMime::ckLastErrorText(mime)
        CkMime::ckDispose(mime)
        ProcedureReturn
    EndIf

    ;  multipart/alternative holds two representations of the SAME content; the client displays the
    ;  last one it can render.  Add a plain-text part, then an HTML part.
    textPart.i = CkMime::ckCreate()
    If textPart.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkMime::ckSetBodyFromPlainText(textPart,"Hello (plain text version).")
    If success = 0
        Debug CkMime::ckLastErrorText(textPart)
        CkMime::ckDispose(mime)
        CkMime::ckDispose(textPart)
        ProcedureReturn
    EndIf

    success = CkMime::ckAppendPart(mime,textPart)
    If success = 0
        Debug CkMime::ckLastErrorText(mime)
        CkMime::ckDispose(mime)
        CkMime::ckDispose(textPart)
        ProcedureReturn
    EndIf

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

    success = CkMime::ckSetBodyFromHtml(htmlPart,"<html><body><b>Hello</b> (HTML version).</body></html>")
    If success = 0
        Debug CkMime::ckLastErrorText(htmlPart)
        CkMime::ckDispose(mime)
        CkMime::ckDispose(textPart)
        CkMime::ckDispose(htmlPart)
        ProcedureReturn
    EndIf

    success = CkMime::ckAppendPart(mime,htmlPart)
    If success = 0
        Debug CkMime::ckLastErrorText(mime)
        CkMime::ckDispose(mime)
        CkMime::ckDispose(textPart)
        CkMime::ckDispose(htmlPart)
        ProcedureReturn
    EndIf

    Debug "Number of alternatives: " + Str(CkMime::ckNumParts(mime))


    CkMime::ckDispose(mime)
    CkMime::ckDispose(textPart)
    CkMime::ckDispose(htmlPart)


    ProcedureReturn
EndProcedure