Node.js

Save an Email to a Temporary MHT File

See more Email Object Examples

Demonstrates the Chilkat Email.CreateTempMht method, which prepares the email for display in a web browser and saves it as a temporary MHT file, returning the path that was written. If the filename argument is empty, Chilkat chooses a temporary filename.

To make the message viewable as a standalone web page, the method transforms it: all attachments are dropped; if the email has both HTML and plain-text alternatives, the plain-text alternative is dropped; and if the email has only a plain-text body, it is converted to HTML. This example loads an HTML email and creates the temporary MHT.

Background: MHT (MIME HTML) is a single-file web-page-archive format — it packs an HTML document together with its images and style sheets into one file, which is essentially what an HTML email already is. Because a Windows WebBrowser control can navigate directly to an .mht file, writing the message out as MHT is a quick way to render a received email, inline images and all, inside a desktop application. The transformations (dropping attachments, keeping just the HTML representation) ensure the result is a clean, self-contained page. For unpacking to loose files served by a web application instead, see AspUnpack.

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function chilkatExample() {

    var success = false;

    //  Demonstrates the CreateTempMht method, which prepares the email for viewing in a browser
    //  and saves it as a temporary MHT (MIME HTML) file, returning the file path.
    //  
    //  To produce browser-viewable output, CreateTempMht transforms the message: it drops all
    //  attachments; if the email has both HTML and plain-text alternatives it drops the
    //  plain-text alternative; and if the email has only a plain-text body it converts that
    //  body to HTML.  Passing an empty filename lets Chilkat choose a temporary filename.

    var email = new chilkat.Email();

    success = email.LoadEml("qa_data/eml/html_with_images.eml");
    if (success == false) {
        console.log(email.LastErrorText);
        return true;
    }

    //  Transform the email for browser display and save it as a temporary MHT file
    //  (empty filename = auto-generated temp file).
    var mhtPath = email.CreateTempMht("");

    console.log("Temporary MHT file: " + mhtPath);

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

}

chilkatExample();