Swift

Get the Nth Binary Part of a Content-Type into BinData

Demonstrates the Chilkat Email.GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth MIME sub-part matching a content-type pattern into a BinData object. The arguments are the zero-based index among the matching parts, the content-type pattern, an inlineOnly flag, an excludeAttachments flag, and the BinData that receives the bytes. This example extracts the first image/png part.

Background: This is the binary, type-targeted way to pull a specific part out of a message — ideal for extracting, say, every image/png or the one application/pdf from a complex MIME tree without caring whether it is an attachment, an inline image, or a body part. Reading into a BinData keeps the raw bytes exact, ready to save, hash, or re-transmit.

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Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth
    //  MIME sub-part matching a Content-Type pattern into a BinData object.  The arguments are
    //  the zero-based index among matching parts, the Content-Type pattern, inlineOnly,
    //  excludeAttachments, and the BinData that receives the bytes.

    let email = CkoEmail()!
    email.subject = "GetNthBinaryPartOfTypeBd example"
    email.body = "See the attached image."

    //  Load the image from a file into a BinData object and attach it (binary data belongs
    //  in a BinData, never in a string).
    let bdImage = CkoBinData()!
    success = bdImage.loadFile(path: "qa_data/images/photo.png")
    if success == false {
        print("\(bdImage.lastErrorText!)")
        return
    }

    success = email.addAttachmentBd(filename: "photo.png", binData: bdImage, contentType: "image/png")
    if success == false {
        print("\(email.lastErrorText!)")
        return
    }

    //  Load the bytes of the first (index 0) image/png part into a BinData object.
    let bd = CkoBinData()!
    success = email.getNthBinaryPart(ofTypeBd: 0, contentType: "image/png", inlineOnly: false, excludeAttachments: false, bd: bd)
    if success == false {
        print("\(email.lastErrorText!)")
        return
    }

    print("image/png part size (bytes) = \(bd.numBytes.intValue)")

    //  Note: The path "qa_data/images/photo.png" is a relative local filesystem path,
    //  relative to the current working directory of the running application.

}