1. 打开首页，分配一个随机uuid，
2. 根据该uuid获取二维码图片。
3. 微信客户端扫描该图片，在客户端确认登录。
4. 浏览器不停的调用一个接口，如果返回登录成功，则调用登录接口
5. 此时可以获取联系人列表，可以发送消息。然后不断调用同步接口。
6. 如果同步接口有返回，则可以获取新消息，然后继续调用同步接口。

• Java版实现源码：https://github.com/biezhi/wechat-robot 或 http://git.oschina.net/biezhi/wechat-robot
• Python实现：https://github.com/Urinx/WeixinBot
• C#实现：https://github.com/sherlockchou86/WeChat.NET
• QT实现：https://github.com/xiangzhai/qwx

执行流程

       +--------------+     +---------------+   +---------------+|              |     |               |   |               ||   Get UUID   |     |  Get Contact  |   | Status Notify ||              |     |               |   |               |+-------+------+     +-------^-------+   +-------^-------+|                    |                   ||                    +-------+  +--------+|                            |  |+-------v------+               +-----+--+------+      +--------------+|              |               |               |      |              ||  Get QRCode  |               |  Weixin Init  +------>  Sync Check  <----+|              |               |               |      |              |    |+-------+------+               +-------^-------+      +-------+------+    ||                              |                      |           ||                              |                      +-----------+|                              |                      |+-------v------+               +-------+--------+     +-------v-------+|              | Confirm Login |                |     |               |
+------>    Login     +---------------> New Login Page |     |  Weixin Sync  |
|      |              |               |                |     |               |
|      +------+-------+               +----------------+     +---------------+
|             |
|QRCode Scaned|
+-------------+

WebWechat API

1. 获取UUID（参考方法 getUUID）

返回数据(String):

window.QRLogin.code = 200; window.QRLogin.uuid = "xxx"

2. 显示二维码（参考方法 showQrCode）

<br>

3. 等待登录（参考方法 waitForLogin）这里是微信确认登录

返回数据(String):

window.code=xxx;xxx:408 登陆超时201 扫描成功200 确认登录当返回200时，还会有
window.redirect_uri="https://wx.qq.com/cgi-bin/mmwebwx-bin/webwxnewloginpage?ticket=xxx&uuid=xxx&lang=xxx&scan=xxx";

4. 登录获取Cookie（参考方法 login）

返回数据(XML):

<error><ret>0</ret><message>OK</message><skey>xxx</skey><wxsid>xxx</wxsid><wxuin>xxx</wxuin><pass_ticket>xxx</pass_ticket><isgrayscale>1</isgrayscale>
</error>

在这一步获取xml中的 skey, wxsid, wxuin, pass_ticket

5. 微信初始化（参考方法 wxInit）

返回数据(JSON):

{"BaseResponse": {"Ret": 0,"ErrMsg": ""},"Count": 11,"ContactList": [...],"SyncKey": {"Count": 4,"List": [{"Key": 1,"Val": 635705559 },...]},"User": {"Uin": xxx,"UserName": xxx,"NickName": xxx,"HeadImgUrl": xxx,"RemarkName": "","PYInitial": "","PYQuanPin": "","RemarkPYInitial": "","RemarkPYQuanPin": "","HideInputBarFlag": 0,"StarFriend": 0,"Sex": 1,"Signature": "Apt-get install B","AppAccountFlag": 0,"VerifyFlag": 0,"ContactFlag": 0,"WebWxPluginSwitch": 0,"HeadImgFlag": 1,"SnsFlag": 17},"ChatSet": xxx,"SKey": xxx,"ClientVersion": 369297683,"SystemTime": 1453124908,"GrayScale": 1,"InviteStartCount": 40,"MPSubscribeMsgCount": 2,"MPSubscribeMsgList": [...],"ClickReportInterval": 600000
}

这一步中获取 SyncKey, User 后面的消息监听用。

6. 开启微信状态通知（参考方法 wxStatusNotify）

返回数据(JSON):

{"BaseResponse": {"Ret": 0,"ErrMsg": ""},...
}

7. 获取联系人列表（参考方法 getContact）

返回数据(JSON):

{"BaseResponse": {"Ret": 0,"ErrMsg": ""},"MemberCount": 334,"MemberList": [{"Uin": 0,"UserName": xxx,"NickName": "Urinx","HeadImgUrl": xxx,"ContactFlag": 3,"MemberCount": 0,"MemberList": [],"RemarkName": "","HideInputBarFlag": 0,"Sex": 0,"Signature": "我是二蛋","VerifyFlag": 8,"OwnerUin": 0,"PYInitial": "URINX","PYQuanPin": "Urinx","RemarkPYInitial": "","RemarkPYQuanPin": "","StarFriend": 0,"AppAccountFlag": 0,"Statues": 0,"AttrStatus": 0,"Province": "","City": "","Alias": "Urinxs","SnsFlag": 0,"UniFriend": 0,"DisplayName": "","ChatRoomId": 0,"KeyWord": "gh_","EncryChatRoomId": ""},...],"Seq": 0
}

8.消息检查（参考方法 syncCheck）

返回数据(String):

window.synccheck={retcode:"xxx",selector:"xxx"}

retcode:0 正常1100 失败/登出微信
selector:0 正常2 新的消息7 进入/离开聊天界面

9. 获取最新消息（参考方法 webwxsync）

返回数据(JSON):

{'BaseResponse': {'ErrMsg': '', 'Ret': 0},'SyncKey': {'Count': 7,'List': [{'Val': 636214192, 'Key': 1},...]},'ContinueFlag': 0,'AddMsgCount': 1,'AddMsgList': [{'FromUserName': '','PlayLength': 0,'RecommendInfo': {...},'Content': "", 'StatusNotifyUserName': '','StatusNotifyCode': 5,'Status': 3,'VoiceLength': 0,'ToUserName': '','ForwardFlag': 0,'AppMsgType': 0,'AppInfo': {'Type': 0, 'AppID': ''},'Url': '','ImgStatus': 1,'MsgType': 51,'ImgHeight': 0,'MediaId': '', 'FileName': '','FileSize': '',...},...],'ModChatRoomMemberCount': 0,'ModContactList': [],'DelContactList': [],'ModChatRoomMemberList': [],'DelContactCount': 0,...
}

10. 发送消息（参考方法 webwxsendmsg）

返回数据(JSON):

{"BaseResponse": {"Ret": 0,"ErrMsg": ""},...
}

更多资料： https://github.com/xiangzhai/qwx https://github.com/Urinx/WeixinBot http://www.07net01.com/2016/01/1201188.html http://www.cnblogs.com/xiaozhi_5638/p/4923811.html