Java

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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import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Email;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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 email = new Email();
        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).
        BinData bdImage = new BinData();
        try {
            bdImage.loadFile("qa_data/images/photo.png");

            email.addAttachmentBd("photo.png", bdImage, "image/png");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Load the bytes of the first (index 0) image/png part into a BinData object.
        BinData bd = new BinData();
        try {
            email.getNthBinaryPartOfTypeBd(0, "image/png", false, false, bd);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("image/png part size (bytes) = " + bd.getNumBytes());

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