Save All MIME Attachments to Files

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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.

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bool success = false;

Chilkat.Mime mime = new Chilkat.Mime();
success = mime.LoadMimeFile("qa_data/multipart_message.eml");
if (success == false) {
    Debug.WriteLine(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.
Chilkat.StringTable savedFiles = new Chilkat.StringTable();
success = mime.PartsToFiles("qa_output/attachments",savedFiles);
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

int n = savedFiles.Count;
Debug.WriteLine("Saved " + Convert.ToString(n) + " files:");
int i;
for (i = 0; i <= n - 1; i++) {
    string name = savedFiles.StringAt(i);
    if (savedFiles.LastMethodSuccess == false) {
        Debug.WriteLine(savedFiles.LastErrorText);
        return;
    }

    Debug.WriteLine(name);
}