Tcl

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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Tcl


load ./chilkat.dll

set success 0

set mime [new_CkMime]

set success [CkMime_LoadMimeFile $mime "qa_data/message.eml"]
if {$success == 0} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkMime $mime
    exit
}

#  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.
set success [CkMime_ConvertToMultipartAlt $mime]
if {$success == 0} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkMime $mime
    exit
}

#  Add an alternative representation of the same content.
set htmlPart [new_CkMime]

set success [CkMime_SetBodyFromHtml $htmlPart "<html><body>HTML alternative.</body></html>"]
if {$success == 0} then {
    puts [CkMime_lastErrorText $htmlPart]
    delete_CkMime $mime
    delete_CkMime $htmlPart
    exit
}

set success [CkMime_AppendPart $mime $htmlPart]
if {$success == 0} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkMime $mime
    delete_CkMime $htmlPart
    exit
}

puts "Number of parts: [CkMime_get_NumParts $mime]"

delete_CkMime $mime
delete_CkMime $htmlPart