JavaScript

Save All MIME Attachments to Files

Demonstrates the Chilkat Mime.PartsToFiles method, which recursively traverses the MIME tree and saves each part having a nonempty filename parameter to a directory. The first argument is the destination directory and the second is a StringTable that receives the saved filenames.

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 extracts every named attachment from a message in one call, walking the whole tree so it finds attachments nested inside multipart containers. It saves only parts that declare a filename — inline body parts without one are skipped — and reports what it wrote via the StringTable, which is handy for logging or follow-up processing. The destination directory must already exist.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

var success = false;

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

//  Recursively traverse the MIME tree and save each part that has a nonempty "filename" parameter
//  to a directory.  The 1st argument is the destination directory and the 2nd is a StringTable
//  that receives the saved filenames.
var savedFiles = new CkStringTable();
success = mime.PartsToFiles("qa_output/attachments",savedFiles);
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

var n = savedFiles.Count;
console.log("Saved " + n + " files:");
var i;
for (i = 0; i <= n - 1; i++) {
    var name = savedFiles.StringAt(i);
    if (savedFiles.LastMethodSuccess == false) {
        console.log(savedFiles.LastErrorText);
        return;
    }

    console.log(name);
}