Java

Add a Related Item from a BinData Object

Demonstrates the Chilkat Email.AddRelatedBd method, which adds a related item (such as an inline image) using the contents of a BinData object, and returns the generated Content-ID. This example loads an image into a BinData, adds it, captures the Content-ID, and references it from the HTML body.

Background: This is the binary, Content-ID-based way to embed an inline resource — the right choice for images, whose bytes belong in a BinData rather than a string. Because Chilkat generates the Content-ID, the usual pattern is: add the item first, capture the returned ID, then build the matching <img src="cid:..."> reference from it (done here with a StringBuilder).

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

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the AddRelatedBd method, which adds a related item (such as an inline image)
        // using the contents of a BinData object, and returns the generated Content-ID.

        Email email = new Email();
        email.setSubject("Related image from BinData");

        // Load the image data from a file into a BinData object.
        BinData bdImage = new BinData();
        String cid;
        try {
            bdImage.loadFile("qa_data/images/logo.png");

            // Add the image as a related item; capture its generated Content-ID.
            cid = email.addRelatedBd("logo.png", bdImage);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Reference the related item in the HTML body by its Content-ID.
        StringBuilder sbHtml = new StringBuilder();
        sbHtml.append("<html><body><img src=\"cid:PLACEHOLDER_CID\"/></body></html>");
        int numReplaced = sbHtml.replace("PLACEHOLDER_CID", cid);
        email.setHtmlBody(sbHtml.getAsString());

        System.out.println("NumRelatedItems = " + email.getNumRelatedItems());

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