Tcl

Check if a MIME Part is an Attachment

Demonstrates the Chilkat Mime.IsAttachment method, which returns whether the current part's Content-Disposition is attachment (matched case-insensitively). It takes no arguments.

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

Background: Whether a part is an attachment is about disposition, not content type — an image can be inline (Content-Disposition: inline) or an attachment. This predicate keys off that header, which is the right basis for deciding what to list as a downloadable attachment versus what to render within the message body.

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Tcl


load ./chilkat.dll

set success 0

#  Demonstrates the Mime.IsAttachment method, which returns whether the part's Content-Disposition is attachment.  It takes no arguments and applies to the current
#  part.  This example iterates the parts of a multipart message and reports which ones match.

set mime [new_CkMime]

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

set n [CkMime_get_NumParts $mime]
set part [new_CkMime]

for {set i 0} {$i <= [expr $n - 1]} {incr i} {
    set success [CkMime_PartAt $mime $i $part]
    if {$success == 0} then {
        puts [CkMime_lastErrorText $mime]
        delete_CkMime $mime
        delete_CkMime $part
        exit
    }

    if {CkMime_IsAttachment $part} then {
        puts "Part $i ([CkMime_contentType $part]) is an attachment."
    }

}

delete_CkMime $mime
delete_CkMime $part