Change the Filename of an Attachment

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Demonstrates the Chilkat Email.SetAttachmentFilename method, which changes the filename of the attachment at a given zero-based index. This example adds an attachment and renames it, printing the filename before and after.

Background: The attachment filename is what a recipient sees and what most clients suggest when saving the file. Renaming it is handy when the original name is unclear, unsafe, or generic — for example giving a machine-generated tmp12345 a meaningful name like invoice.pdf before sending.

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    success := false

    //  Demonstrates the SetAttachmentFilename method, which changes the filename of the
    //  attachment at the given zero-based index.

    email := chilkat.NewEmail()
    email.SetSubject("Set attachment filename")

    email.AddStringAttachment("oldname.txt","Some notes.")
    fmt.Println("Filename before: ", *email.GetAttachmentFilename(0))

    //  Change the filename of the first attachment (index 0).
    success = email.SetAttachmentFilename(0,"newname.txt")
    if success == false {
        fmt.Println(email.LastErrorText())
        email.DisposeEmail()
        return
    }

    fmt.Println("Filename after: ", *email.GetAttachmentFilename(0))

    email.DisposeEmail()