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

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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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    success := 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.

    email := chilkat.NewEmail()
    email.SetSubject("GetNthBinaryPartOfTypeBd example")
    email.SetBody("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).
    bdImage := chilkat.NewBinData()
    success = bdImage.LoadFile("qa_data/images/photo.png")
    if success == false {
        fmt.Println(bdImage.LastErrorText())
        email.DisposeEmail()
        bdImage.DisposeBinData()
        return
    }

    success = email.AddAttachmentBd("photo.png",bdImage,"image/png")
    if success == false {
        fmt.Println(email.LastErrorText())
        email.DisposeEmail()
        bdImage.DisposeBinData()
        return
    }

    //  Load the bytes of the first (index 0) image/png part into a BinData object.
    bd := chilkat.NewBinData()
    success = email.GetNthBinaryPartOfTypeBd(0,"image/png",false,false,bd)
    if success == false {
        fmt.Println(email.LastErrorText())
        email.DisposeEmail()
        bdImage.DisposeBinData()
        bd.DisposeBinData()
        return
    }

    fmt.Println("image/png part size (bytes) = ", bd.NumBytes())

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

    email.DisposeEmail()
    bdImage.DisposeBinData()
    bd.DisposeBinData()