如何在电子邮件中嵌入图像 [英] How to embed images in email

问题描述

我需要在电子邮件中嵌入图像。我如何做？

I need to embed an image in e-mail. How do I do it?

我不想使用第三方工具，也没有对语言具体的答案感兴趣（但是，如果您想知道）

I do not want to use third party tool, nor am I interested in language specific answer (but it is PHP, in case you are wondering).

我只对生成的电子邮件正文的格式感兴趣。

I am merely interested in format of resulting e-mail body.

推荐答案

如你所知，所有通过电子邮件传递的内容都必须进行文字化。

As you are aware, everything passed as email message has to be textualized.

• 您必须创建一个包含multipart / mime消息的电子邮件。


• 如果要添加一个物理图像，图像必须是基础64编码并分配一个Content-ID（cid）。如果它是一个URL，那么< img /> 标签就足够了（映像的URL必须链接到源代码）。

• You must create an email with a multipart/mime message.
• If you're adding a physical image, the image must be base 64 encoded and assigned a Content-ID (cid). If it's an URL, then the <img /> tag is sufficient (the url of the image must be linked to a Source ID).

典型的电子邮件示例如下所示：

A Typical email example will look like this:

From: foo1atbar.net
To: foo2atbar.net
Subject: A simple example
Mime-Version: 1.0
Content-Type: multipart/related; boundary="boundary-example"; type="text/html"

--boundary-example
Content-Type: text/html; charset="US-ASCII"

... text of the HTML document, which might contain a URI
referencing a resource in another body part, for example
through a statement such as:
<IMG SRC="cid:foo4atfoo1atbar.net" ALT="IETF logo">

--boundary-example
Content-Location: CID:somethingatelse ; this header is disregarded
Content-ID: <foo4atfoo1atbar.net>
Content-Type: IMAGE/GIF
Content-Transfer-Encoding: BASE64

R0lGODlhGAGgAPEAAP/////ZRaCgoAAAACH+PUNv
cHlyaWdodCAoQykgMTk5LiBVbmF1dGhvcml6ZWQgZHV
wbGljYXRpb24gcHJvaGliaXRlZC4A etc...

--boundary-example--

请参阅 Content-ID：< foo4atfoo1atbar.net> ID与< IMG> code> SRC = CID：foo4atfoo1atbar.net。这样，客户端浏览器会将您的图像呈现为内容，而不是附件。

As you can see, the Content-ID: <foo4atfoo1atbar.net> ID is matched to the <IMG> at SRC="cid:foo4atfoo1atbar.net". That way, the client browser will render your image as a content and not as an attachement.

希望这有帮助。

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