Tcl

Attach a File with an Explicit Content Type

Demonstrates the Chilkat Email.AddFileAttachment2 method, which attaches a file from the filesystem and lets you explicitly specify its content type rather than having Chilkat infer it from the file extension. This example attaches a binary file as application/octet-stream.

Background: Extension-based type detection is convenient but not always right — a file may have an unusual or missing extension, or you may need a very specific MIME type for the recipient to process it correctly. Specifying the content type explicitly removes the guesswork. application/octet-stream is the generic "arbitrary binary data" type, a safe default that tells the client to treat the attachment as an opaque download rather than trying to render it.

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Tcl


load ./chilkat.dll

set success 0

#  Demonstrates the AddFileAttachment2 method, which attaches a file and lets you
#  explicitly specify its content type instead of letting Chilkat infer it.

set email [new_CkEmail]

CkEmail_put_Subject $email "Email with a file attachment"
CkEmail_put_Body $email "Please see the attached file."

#  Attach a file, explicitly specifying the content type.
set success [CkEmail_AddFileAttachment2 $email "qa_data/attachments/data.bin" "application/octet-stream"]
if {$success == 0} then {
    puts [CkEmail_lastErrorText $email]
    delete_CkEmail $email
    exit
}

puts "NumAttachments = [CkEmail_get_NumAttachments $email]"

#  Note: The path "qa_data/attachments/data.bin" is a relative local filesystem path,
#  relative to the current working directory of the running application.

delete_CkEmail $email