.NET如何提取电子邮件中嵌入图像？ [英] .NET How to extract embedded image from email message?

问题描述

您好我工作的一个项目，在.NET 1.1和我有一个要求，提取（并保存它的地方）的嵌入式从我收到的电子邮件的形象。

Hello I'm working on a project in .NET 1.1 and I have a requirement to extract (and save it somewhere) embedded image from emails that I'm receiving.

有人可以给我，从哪里开始线索？

Can someone give me a clue on where to start?

谢谢

推荐答案

从POP服务器下载将文本格式的邮件，你必须分析整个电子邮件，并找到所有的＆LT ; IMG /＆GT; 具有的src 属性设置为 CID标签：*

The email downloaded from the POP server will be in text format, you will have to parse the whole email, and find all the <img /> tags having the src attribute set to cid:*

例如。

<img src='cid:006901c6d391$dee64770$6c822ecf@Z2LC74Q' />

包含嵌入图像的电子邮件的格式将是如下： -

The format of an email containing the embedded image will be as follows -

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"> 
...snip...
Content-Location: CID:somethingatelse ;this header is disregarded 
Content-ID: <006901c6d391$dee64770$6c822ecf@Z2LC74Q>
Content-Type: IMAGE/GIF 
Content-Transfer-Encoding: BASE64 

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

...snip...

如果你看一看页脚，它包含一个base64连接codeD映像的版本。您可以提取的BASE64字符串，将其转换为基于电子邮件的字符集的字节，并将其保存到一个文件中（你可以根据内容类型的文件扩展名）。田田，大功告成了！

If you take a look at the footer, it contains a BASE64 encoded version of your image. You can extract the the BASE64 string, convert it to bytes based on the email character set, and save it to a file (you can get the file extension based on the Content-Type). Tada, done!

希望你已经有了如何做到这一点的想法！

Hope you've got an idea of how to do it!

我还发现了一个类似地问题<一href="http://stackoverflow.com/questions/440356/extracting-embedded-images-from-outlook-email">here.他使​​用CDO（协作数据对象）。

I also found a similary question here. He's using CDO (Collaboration Data Objects).

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