如何使用 libetpan 解析电子邮件？
How to parse an email with libetpan?
我将 libetpan 与 C 代码一起使用，并且我在 .eml 文件中有一封电子邮件（带有 2 个附件）：
MIME-Version: 1.0
Received: by 10.76.171.68 with HTTP; Mon, 2 Feb 2015 06:35:10 -0800 (PST)
Bcc: e.chizat+3@klrvi.com
Date: Mon, 2 Feb 2015 15:35:10 +0100
Delivered-To: e.chizat@klervi.com
Message-ID: <CAE2Tr_-3a+VyD4rO0YYdHqrNrPk10oMcL2G4mDLa-sFJXykrdA@mail.gmail.com>
Subject: subject
From: email@email.com
To: email@email.com
Cc: email@email.com
Content-Type: multipart/mixed; boundary=047d7b41436a901ca8050e1bdc67
--047d7b41436a901ca8050e1bdc67
Content-Type: multipart/alternative; boundary=047d7b41436a901ca3050e1bdc65
--047d7b41436a901ca3050e1bdc65
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
Some text
--047d7b41436a901ca3050e1bdc65
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
<div>Some text</div>
--047d7b41436a901ca3050e1bdc65--
--047d7b41436a901ca8050e1bdc67
Content-Type: image/png; name="accueil.png"
Content-Disposition: attachment; filename="accueil.png"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_i5nyjma30
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--047d7b41436a901ca8050e1bdc67
Content-Type: image/png; name="ajouter.png"
Content-Disposition: attachment; filename="ajouter.png"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_i5nyjr0o1
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--047d7b41436a901ca8050e1bdc67--
我的问题是，当我有条件地显示 mime->mm_data.mm_single->dt_data.dt_text.dt_data（如果这个 mime 部分是 'plain/texte'）时，我得到：
<div>Some text</div>
--047d7b41436a901ca3050e1bdc65--
--047d7b41436a901ca8050e1bdc67
Content-Type: image/png; name="accueil.png"
Content-Disposition: attachment; filename="accueil.png"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_i5nyjma30
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--047d7b41436a901ca8050e1bdc67
Content-Type: image/png; name="ajouter.png"
Content-Disposition: attachment; filename="ajouter.png"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_i5nyjr0o1
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--047d7b41436a901ca8050e1bdc67--
我怎样才能得到（或多或少的 Content-* 部分）：
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
<div>Some text</div>
mime->mm_data.mm_single->dt_data.dt_text.dt_data是我正文的开头。我必须使用 mime->mm_data.mm_single->dt_data.dt_text.dt_length、我的文本长度来打印它。
我将 libetpan 与 C 代码一起使用，并且我在 .eml 文件中有一封电子邮件（带有 2 个附件）：
MIME-Version: 1.0
Received: by 10.76.171.68 with HTTP; Mon, 2 Feb 2015 06:35:10 -0800 (PST)
Bcc: e.chizat+3@klrvi.com
Date: Mon, 2 Feb 2015 15:35:10 +0100
Delivered-To: e.chizat@klervi.com
Message-ID: <CAE2Tr_-3a+VyD4rO0YYdHqrNrPk10oMcL2G4mDLa-sFJXykrdA@mail.gmail.com>
Subject: subject
From: email@email.com
To: email@email.com
Cc: email@email.com
Content-Type: multipart/mixed; boundary=047d7b41436a901ca8050e1bdc67
--047d7b41436a901ca8050e1bdc67
Content-Type: multipart/alternative; boundary=047d7b41436a901ca3050e1bdc65
--047d7b41436a901ca3050e1bdc65
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
Some text
--047d7b41436a901ca3050e1bdc65
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
<div>Some text</div>
--047d7b41436a901ca3050e1bdc65--
--047d7b41436a901ca8050e1bdc67
Content-Type: image/png; name="accueil.png"
Content-Disposition: attachment; filename="accueil.png"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_i5nyjma30
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--047d7b41436a901ca8050e1bdc67
Content-Type: image/png; name="ajouter.png"
Content-Disposition: attachment; filename="ajouter.png"
Content-Transfer-Encoding: base64
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--047d7b41436a901ca8050e1bdc67--
我的问题是，当我有条件地显示 mime->mm_data.mm_single->dt_data.dt_text.dt_data（如果这个 mime 部分是 'plain/texte'）时，我得到：
<div>Some text</div>
--047d7b41436a901ca3050e1bdc65--
--047d7b41436a901ca8050e1bdc67
Content-Type: image/png; name="accueil.png"
Content-Disposition: attachment; filename="accueil.png"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_i5nyjma30
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--047d7b41436a901ca8050e1bdc67
Content-Type: image/png; name="ajouter.png"
Content-Disposition: attachment; filename="ajouter.png"
Content-Transfer-Encoding: base64
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zOeyK+VL+Vz2/+NgFikAIaQ5S/vBlerjta3W6VIuXmF2WVdy5D/0GkOwilRKNJ+07bJuMM1tBwC8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==
--047d7b41436a901ca8050e1bdc67--
我怎样才能得到（或多或少的 Content-* 部分）：
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
<div>Some text</div>
mime->mm_data.mm_single->dt_data.dt_text.dt_data是我正文的开头。我必须使用 mime->mm_data.mm_single->dt_data.dt_text.dt_length、我的文本长度来打印它。