如何使用 MAPI 分离内联图像和附件？
我的程序使用 MAPI 来处理 Exchange 邮箱。问题是，如果用户启动 Outlook，添加一个文件作为附件，同时打开“画图”，选择其中的一个区域，将其复制到剪贴板并将其粘贴到邮件正文中，则生成的邮件将显示两个附件。
更具体地说，程序调用 IMAPIMessage::GetAttachmentsTable() 来检索附件表，并且该表包含两个对象。有没有一种方法可以让程序确定“附件”是否真的是附加文件或内联内容的一部分？
My program uses MAPI for working with Exchange mailboxes. The problem is if a user fires up Outlook, adds a file as an attachment and also opens Paint, selects a region there, copies it into clipboard and pastes into the message body the resulting message showns two attachments.
More specifically, the program calls IMAPIMessage::GetAttachmentsTable() to retrieve the attachments table and that table contains two objects. Is there a way a program can decide whether the "attachment" is really an attached file or a portion of inline content?
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您需要通过 img:cid 和 PT_ATTACH_CONENTS_ID 属性或通过文件名 (PR_ATTACH_LONG_FILENAME) 或内容位置 (PR_ATTACH_COMTENT_LOCATION) 检查 HTML 正文（通过 img 标记）是否引用附件。
You will need to check whether the HTML body (through the img tag) refers to the attachment, either through img:cid and PT_ATTACH_CONENTS_ID property or though the file name (PR_ATTACH_LONG_FILENAME) or contnet location (PR_ATTACH_COMTENT_LOCATION).
更好的选择是查找
PR_ATTACHMENT_HIDDEN。如果已设置，则它是内嵌图像，并且在查看电子邮件时不会显示为常规附件。A better option is to look for
PR_ATTACHMENT_HIDDEN. If it's set then it's an inline image and doesn't appear as a regular attachment when viewing the email.您要查找的属性是 PR_RENDERING_POSITION (0x370B0003)。 -1 表示附件是“正常”附件并且不是内嵌的。如果该值为 -1 以外的任何值，则表示内嵌附件，并且该值是正文中附件应呈现的位置。
这是描述它的 MSDN 页面。
编辑：
德米特里，我不同意你的评论。我有带有内联附件的 HTML 电子邮件，并且 PR_RENDERING_POSITION 正在按照我发布的 MSDN 页面中的描述工作。
The property you are looking for is PR_RENDERING_POSITION (0x370B0003). A -1 means that the attachment is a "normal" attachment and not in-line. If the value is anything other than -1, then that indicates an in-line attachment and the value is the position in the body that the attachment should be rendered at.
Here is the MSDN page describing it.
EDIT:
Dmitry, I do not agree with your comment. I have HTML email messages with in-line attachments and the PR_RENDERING_POSITION is working as described in the MSDN page I posted.