Node.js

Set a MIME Body, Preserving Content Headers

Demonstrates the Chilkat Mime.SetBody method, which sets the current part's body while preserving the existing content headers (Content-Type, charset, Content-Transfer-Encoding). The only argument is the body text; it is a void method.

Background: Unlike the SetBodyFrom... methods, which set both the content and the headers that describe it, SetBody replaces only the body text and leaves the existing Content-Type and encoding in place. That is what you want when the media type is already correct and you simply need to swap in new content — updating a templated part, for instance — without re-declaring its type.

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function chilkatExample() {

    var success = false;

    //  Demonstrates the Mime.SetBody method, which sets the current part's body while preserving the
    //  existing content headers (Content-Type, charset, Content-Transfer-Encoding).  The only argument
    //  is the body text.  It is a void method.

    var mime = new chilkat.Mime();

    //  Establish the content headers first.
    success = mime.SetBodyFromPlainText("initial");
    if (success == false) {
        console.log(mime.LastErrorText);
        return;
    }

    //  Replace just the body text, keeping the existing Content-Type and encoding.
    mime.SetBody("This is the replacement body text.");

    var mimeText = mime.GetMime();
    if (mime.LastMethodSuccess == false) {
        console.log(mime.LastErrorText);
        return;
    }

    console.log(mimeText);

}

chilkatExample();