Node.js

Convert a MIME Entity to multipart/mixed

Demonstrates the Chilkat Mime.ConvertToMultipartMixed method, which wraps the current entity in a new outer multipart/mixed, making the original the first child. It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you turn an existing single-part message into one that can hold attachments — rather than rebuilding it, you wrap it, and its content becomes the first child of a new multipart/mixed. Message-level and custom headers are carried onto the new outer entity so the message identity is preserved. Afterward, AppendPartFromFile adds attachments beside the original body.

Chilkat Node.js Downloads

Download Chilkat for Node.js

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    var mime = new chilkat.Mime();
    success = mime.LoadMimeFile("qa_data/message.eml");
    if (success == false) {
        console.log(mime.LastErrorText);
        return;
    }

    //  Wrap the current entity in a new outer multipart/mixed entity.  The original entity becomes the
    //  first child, which is what you do to add attachments to an existing single-part message.
    success = mime.ConvertToMultipartMixed();
    if (success == false) {
        console.log(mime.LastErrorText);
        return;
    }

    //  Now attachments can be appended alongside the original content.
    success = mime.AppendPartFromFile("qa_data/report.pdf");
    if (success == false) {
        console.log(mime.LastErrorText);
        return;
    }

    console.log("Number of parts: " + mime.NumParts);

}

chilkatExample();