Xbase++

Convert 8-bit MIME Parts to Base64

Demonstrates the Chilkat Mime.Convert8Bit method, which recursively converts every part whose Content-Transfer-Encoding is 8bit or binary to base64. It takes no arguments and is a void method.

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: The original SMTP standard only guaranteed 7-bit transport, and some legacy servers still reject or mangle raw 8-bit and binary content. Converting those parts to base64 — a 7-bit-safe encoding — makes the whole message safe to relay through such systems without loss. It walks the entire tree, so a multipart message with several offending parts is fixed in one call.

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LOCAL nSuccess
LOCAL oMime
LOCAL cMimeText

nSuccess := 0

oMime := CreateObject("Chilkat.Mime")
nSuccess := oMime:LoadMimeFile("qa_data/message.eml")
IF (nSuccess == 0)
    ? oMime:LastErrorText
    oMime:destroy()
    RETURN
ENDIF

//  Recursively convert every part whose Content-Transfer-Encoding is 8bit or binary to base64.
//  This makes the MIME safe to transmit over channels that only support 7-bit text (such as some
//  legacy SMTP servers).
oMime:Convert8Bit()

? "8bit/binary parts converted to base64."
cMimeText := oMime:GetMime()
IF (oMime:LastMethodSuccess == 0)
    ? oMime:LastErrorText
    oMime:destroy()
    RETURN
ENDIF

? cMimeText

oMime:destroy()