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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bool 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.

Chilkat.Email email = new Chilkat.Email();
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).
Chilkat.BinData bdImage = new Chilkat.BinData();
success = bdImage.LoadFile("qa_data/images/photo.png");
if (success == false) {
    Debug.WriteLine(bdImage.LastErrorText);
    return;
}

success = email.AddAttachmentBd("photo.png",bdImage,"image/png");
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

//  Load the bytes of the first (index 0) image/png part into a BinData object.
Chilkat.BinData bd = new Chilkat.BinData();
success = email.GetNthBinaryPartOfTypeBd(0,"image/png",false,false,bd);
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

Debug.WriteLine("image/png part size (bytes) = " + Convert.ToString(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.