Visual FoxPro

Convert a MIME Entity to multipart/alternative

Demonstrates the Chilkat Mime.ConvertToMultipartAlt method, which wraps the current entity in a new outer multipart/alternative, making the original the first child. It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Use this to add an alternate rendering to an existing message — for example, promoting a plain-text message so an HTML version can be added alongside it. The original content becomes the first (least-preferred) alternative, and you append the richer representation after it. As with the mixed conversion, message-level headers move to the new outer entity.

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Visual FoxPro

LOCAL lnSuccess
LOCAL loMime
LOCAL loHtmlPart

lnSuccess = 0

loMime = CreateObject('Chilkat.Mime')
lnSuccess = loMime.LoadMimeFile("qa_data/message.eml")
IF (lnSuccess = 0) THEN
    ? loMime.LastErrorText
    RELEASE loMime
    CANCEL
ENDIF

*  Wrap the current entity in a new outer multipart/alternative entity.  The original entity
*  becomes the first child, ready for an alternate representation to be added.
lnSuccess = loMime.ConvertToMultipartAlt()
IF (lnSuccess = 0) THEN
    ? loMime.LastErrorText
    RELEASE loMime
    CANCEL
ENDIF

*  Add an alternative representation of the same content.
loHtmlPart = CreateObject('Chilkat.Mime')
lnSuccess = loHtmlPart.SetBodyFromHtml("<html><body>HTML alternative.</body></html>")
IF (lnSuccess = 0) THEN
    ? loHtmlPart.LastErrorText
    RELEASE loMime
    RELEASE loHtmlPart
    CANCEL
ENDIF

lnSuccess = loMime.AppendPart(loHtmlPart)
IF (lnSuccess = 0) THEN
    ? loMime.LastErrorText
    RELEASE loMime
    RELEASE loHtmlPart
    CANCEL
ENDIF

? "Number of parts: " + STR(loMime.NumParts)

RELEASE loMime
RELEASE loHtmlPart