100分，请问怎样用wininet发包含图片附件的帖子到discuz论坛上？

想发帖子（帖子中包含图片附件）到discuz论坛上，请问用WinInet怎么做？谢谢。下面是我抓的包：

POST /post.php?action=newthread&fid=25&extra=page%3D1&topicsubmit=yes HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, */*
Referer: http://www.cash163.com/post.php?action=newthread&fid=25&extra=page%3D1
Accept-Language: zh-cn
Content-Type: multipart/form-data; boundary=---------------------------7d81093510146
UA-CPU: x86
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; QQDownload 1.7; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; Maxthon; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; Alexa Toolbar)
Host: www.xxx.com
Content-Length: 67981
Connection: Keep-Alive
Cache-Control: no-cache
Cookie: OWg_sid=UXyDyE; OWg_cookietime=315360000; OWg_auth=wsrO5f5SztNcXE%2F5yTNJlMRB%2F0G9gaIXVAHuv3U6j7PuOS4JdF73RcHDybTr4b8; OWg_visitedfid=25; AJSTAT_ok_times=4; rtime=3; ltime=1204633624562; cnzz_eid=77054026-; AJSTAT_ok_pages=13; cnzz02=10; OWg_oldtopics=D335504D335578D335659D; OWg_fid25=1204633434; isjssuport=yes; OWg_onlineusernum=7315

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Content-Disposition: form-data; name="formhash"

f0f7bfb5
-----------------------------7d81093510146
Content-Disposition: form-data; name="isblog"


-----------------------------7d81093510146
Content-Disposition: form-data; name="frombbs"

1
-----------------------------7d81093510146
Content-Disposition: form-data; name="readperm"

0
-----------------------------7d81093510146
Content-Disposition: form-data; name="price"

0
-----------------------------7d81093510146
Content-Disposition: form-data; name="subject"

比调客网还好的新站！我加入8天已2次收款！
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Content-Disposition: form-data; name="iconid"

0
-----------------------------7d81093510146
Content-Disposition: form-data; name="message"

免费加入新豆网：你可以
1.通过新豆网去合作商家注册获得返现：37元！（2008年3月31日前满10元即可提现！）
2.购物返现：通过新豆网在当当、卓越等进行网上购物最高返利25%！
3.推荐朋友也赚钱：完全免费，推荐一人0.5元！如果你推荐的朋友生成购物返利或注册返利成功，你可以再获得3元！
4.每月新豆网都有精彩活动！例如：2月1日--2月29日的活动：从会员中抽取幸运奖：共111名！奖励5--100元！nano、psp有机会免费抱回家！还有其他更多礼物，还不心动吗！
5.新豆会员可以免费开设我的商店，好朋友、零花钱都会滚滚而来！
注册地址： [size=6]http://www.51xindou.com/[/size]
-----------------------------7d81093510146
Content-Disposition: form-data; name="attach[]"; filename=""
Content-Type: application/octet-stream


-----------------------------7d81093510146
Content-Disposition: form-data; name="localid[]"


-----------------------------7d81093510146
Content-Disposition: form-data; name="attachperm[]"

0
-----------------------------7d81093510146
Content-Disposition: form-data; name="attachprice[]"

0
-----------------------------7d81093510146
Content-Disposition: form-data; name="attachdesc[]"


-----------------------------7d81093510146
Content-Disposition: form-data; name="attach[]"; filename="C:\新豆.JPG"
Content-Type: image/pjpeg

? JFIF ` `  LEAD Technologies Inc. V1.01  ?
-----------------------------7d81093510146
Content-Disposition: form-data; name="localid[]"

1
-----------------------------7d81093510146
Content-Disposition: form-data; name="attachperm[]"

0
-----------------------------7d81093510146
Content-Disposition: form-data; name="attachprice[]"

0
-----------------------------7d81093510146
Content-Disposition: form-data; name="attachdesc[]"


-----------------------------7d81093510146
Content-Disposition: form-data; name="attach[]"; filename=""
Content-Type: application/octet-stream


-----------------------------7d81093510146
Content-Disposition: form-data; name="localid[]"

2
-----------------------------7d81093510146
Content-Disposition: form-data; name="attachperm[]"

0
-----------------------------7d81093510146
Content-Disposition: form-data; name="attachprice[]"

0
-----------------------------7d81093510146
Content-Disposition: form-data; name="attachdesc[]"


-----------------------------7d81093510146
Content-Disposition: form-data; name="wysiwyg"

1
-----------------------------7d81093510146--