Tcl

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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Tcl


load ./chilkat.dll

set success 0

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

set mime [new_CkMime]

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

#  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.
set textPart [new_CkMime]

set success [CkMime_SetBodyFromPlainText $textPart "Hello (plain text version)."]
if {$success == 0} then {
    puts [CkMime_lastErrorText $textPart]
    delete_CkMime $mime
    delete_CkMime $textPart
    exit
}

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

set htmlPart [new_CkMime]

set success [CkMime_SetBodyFromHtml $htmlPart "<html><body><b>Hello</b> (HTML version).</body></html>"]
if {$success == 0} then {
    puts [CkMime_lastErrorText $htmlPart]
    delete_CkMime $mime
    delete_CkMime $textPart
    delete_CkMime $htmlPart
    exit
}

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

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

delete_CkMime $mime
delete_CkMime $textPart
delete_CkMime $htmlPart