Get an Alternative Body into a BinData

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Demonstrates the Chilkat Email.GetAlternativeBodyBd method, which copies the contents of the Nth alternative body into a BinData object. The first alternative body is at index 0, and it should only be called when NumAlternatives is greater than 0. This example builds a message with plain-text and HTML alternatives and copies the first into a BinData.

Background: This is the binary counterpart to GetAlternativeBody (which returns text). Reading an alternative into a BinData preserves the exact bytes — important when a body part uses a binary or unusual transfer encoding, or when you intend to hash it or write it out verbatim rather than decode it to a string.

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bool success = false;

//  Demonstrates the GetAlternativeBodyBd method, which copies the contents of the Nth
//  alternative body into a BinData object.  The first alternative body is at index 0; call
//  only when NumAlternatives is greater than 0.

Chilkat.Email email = new Chilkat.Email();
email.Subject = "GetAlternativeBodyBd example";

email.SetTextBody("This is the plain-text alternative.","text/plain");
email.AddHtmlAlternativeBody("<html><body>This is the HTML alternative.</body></html>");

//  Copy the first alternative body (index 0) into a BinData object.
Chilkat.BinData bd = new Chilkat.BinData();

success = email.GetAlternativeBodyBd(0,bd);
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

Debug.WriteLine("Alternative 0 size (bytes) = " + Convert.ToString(bd.NumBytes));