Enumerate the Header Fields of an Email

See more Email Object Examples

Demonstrates the read-only Chilkat Email.NumHeaderFields property together with GetHeaderFieldName and GetHeaderFieldValue to enumerate every header field. Indexing is zero-based, so fields run from 0 to NumHeaderFields - 1. Repeated header fields (a field name that appears more than once) are counted separately. This example builds a small email and prints each header field.

Background: A header field is a single Name: value line at the top of a MIME message. The same field name can legitimately appear multiple times — for example, a message can carry several Received lines, one added by each mail server it passed through. That is why enumerating by index (rather than looking up by name) matters: it lets you see every occurrence in the order it appears.

Chilkat Go Downloads

Download Chilkat for Go

    //  Demonstrates the read-only Email.NumHeaderFields property and enumerating each
    //  header field by zero-based index using GetHeaderFieldName and GetHeaderFieldValue.

    email := chilkat.NewEmail()
    email.SetSubject("Header field enumeration")
    email.SetFrom("mary@example.com")
    email.AddTo("Joe","joe@example.com")

    n := email.NumHeaderFields()
    fmt.Println("NumHeaderFields = ", n)

    var i int
    for i = 0; i <= n - 1; i++ {
        fmt.Println(*email.GetHeaderFieldName(i), ": ", *email.GetHeaderFieldValue(i))
    }


    email.DisposeEmail()