Node.js

Access a Part in a Multipart MIME Entity

Demonstrates the Chilkat Mime.PartAt method, which provides live access to the direct child at a zero-based index. The first argument is the index and the second is a Mime object that will reference the child. Modifying it modifies the child stored in the parent tree.

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 reach into a multipart message to inspect or edit an individual part — read a part's Content-Type, extract an attachment's body, or change a part in place. The key point is that the returned Mime is a live reference, not a copy, so edits to it flow back into the parent tree. Loop from 0 to NumParts - 1 to visit every direct child.

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function chilkatExample() {

    var success = false;

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

    //  PartAt provides LIVE access to a direct child part.  The 1st argument is the zero-based index
    //  and the 2nd is a Mime object that will reference the child.  Modifying it modifies the child in
    //  the parent tree.
    var n = mime.NumParts;
    console.log("Number of parts: " + n);

    var part = new chilkat.Mime();
    var i;
    for (i = 0; i <= n - 1; i++) {
        success = mime.PartAt(i,part);
        if (success == false) {
            console.log(mime.LastErrorText);
            return;
        }

        console.log("Part " + i + " Content-Type: " + part.ContentType);
    }


}

chilkatExample();