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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Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean 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.

    CkEmail email = new CkEmail();
    email.put_Subject("GetNthBinaryPartOfTypeBd example");
    email.put_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).
    CkBinData bdImage = new CkBinData();
    success = bdImage.LoadFile("qa_data/images/photo.png");
    if (success == false) {
        System.out.println(bdImage.lastErrorText());
        return;
        }

    success = email.AddAttachmentBd("photo.png",bdImage,"image/png");
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

    //  Load the bytes of the first (index 0) image/png part into a BinData object.
    CkBinData bd = new CkBinData();
    success = email.GetNthBinaryPartOfTypeBd(0,"image/png",false,false,bd);
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

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