(Swift) Transition from MailMan.FetchSingleHeader to MailMan.FetchOne

Provides instructions for replacing deprecated FetchSingleHeader method calls with FetchOne.

Note: This example requires Chilkat v11.0.0 or greater.

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func chilkatTest() {
    let mailman = CkoMailMan()!

    // ...
    // ...

    var numBodyLines: Int = 5
    var msgnum: Int = 1

    // ------------------------------------------------------------------------
    // The FetchSingleHeader method is deprecated:

    var emailObj: CkoEmail? = mailman.fetchSingleHeader(numBodyLines, msgNum: msgnum)
    if mailman.lastMethodSuccess == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    // ...
    // ...

    emailObj = nil

    // ------------------------------------------------------------------------
    // Do the equivalent using FetchOne.
    // Your application creates a new, empty Email object which is passed 
    // in the last argument and filled upon success.

    var headerOnly: Bool = true

    let emailOut = CkoEmail()!
    var success: Bool = mailman.fetchOne(headerOnly, numBodyLines: numBodyLines, msgNum: msgnum, email: emailOut)
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }


}