(C++) Add Header Field to MIME Sub-Header in Email

Demonstrates how to add a header field to one of the attachment sub-headers in an email.

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#include <CkEmail.h>

void ChilkatSample(void)
    {
    bool success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkEmail email;

    email.put_Subject("test");
    email.AddTo("Chilkat","support@chilkatsoft.com");
    email.put_From("Matt <matt@example.com>");
    email.put_Body("This is a simple plain-text body.");

    success = email.AddFileAttachment2("qa_data/1.HPM","application/x-hprimnet");
    if (success == false) {
        std::cout << email.lastErrorText() << "\r\n";
        return;
    }

    // Add a "ContentDescription: HPM/3.0" in the attachment's sub-header.
    // The 1st attachment is at index 0.
    email.AddAttachmentHeader(0,"Content-Description","HPM/3.0");

    // Show the email MIME:
    std::cout << email.getMime() << "\r\n";

    // This is the output:

    // MIME-Version: 1.0
    // Date: Wed, 16 Jan 2019 10:05:18 -0600
    // Message-ID: <93B88835586270B7BE5202F84E171F29C10BA935@CHILKATSLICE>
    // Content-Type: multipart/mixed; boundary="------------000502000000020502010608"
    // X-Priority: 3 (Normal)
    // Subject: test
    // To: Chilkat <support@chilkatsoft.com>
    // From: Matt <matt@example.com>
    // 
    // --------------000502000000020502010608
    // Content-Type: text/plain; charset=us-ascii; format=flowed
    // Content-Transfer-Encoding: 7bit
    // 
    // This is a simple plain-text body.
    // --------------000502000000020502010608
    // Content-Type: application/x-hprimnet; name="1.HPM"
    // Content-Transfer-Encoding: base64
    // Content-Disposition: attachment; filename="1.HPM"
    // Content-Description: HPM/3.0
    // 
    // FILE_DATA_IS_HERE...
    // 
    // --------------000502000000020502010608--
    }