一、前言

    因为一些工作需要，所以研究了一下易盛交易API，然后想到C++对于很多人来说还是非常不友好的所以就想着说要不写一个C++转websocket（以下简称WS）的接口，用WS接口不就可以跨全部平台来交易了吗（特别是WEB和python）？后来在研究和转写的过程中，发现从技术的角度来说其实很没有必要，所以弄了一半，搞了个框架就懒得搞了。但是折腾了几个月不能浪费了对吧，所以就分享出来给大家一起研究学习了。

    此前已经写了两篇相关的，分别是如何搭建交易API的环境，以及WS server的demo：

    https://www.cnblogs.com/cation/p/15245161.html

    https://www.cnblogs.com/cation/p/15254165.html

二、思路

    1、主线程启动后，启动WS的Server，并一直监听client

    2、client连接后启动子进程

    3、子进程内获取client的消息

    4、通过对消息的识别来实现“登陆、登出、查询、下单”等操作

三、代码

    腾讯微云下载

    https://share.weiyun.com/qrgMVIzX

四、使用

    1、准备

    跟代码一起奉送的是一个WS client。

    另外你还得有个API授权码，不过易盛demo中是带了测试账号和授权码的。

    开发环境自己搞定，然后启动项目。

    2、登陆

    先启动项目，启动后再启动WS client。

    WS clinet连接成功时会报一个“Illegal JSON format”的error，是正常的，因为这个client会有个广告词启动时发给server，属于可识别范围外的字符所以就会报一个error。

     填入JSON字符，发送给server后就登陆API了。可以看到登陆成功后会收到一系列的RSP。

     登陆成功后还是发JSON字符串，比如下面做个查询。

五、已支持的指令

========登陆 登出========
启明星登陆
{"command":"login","ip":"XXXXXXX","port":XXXXXXX,"auth":"XXXXXXX","type":"QMX","username":"XXXXXXX","password":"XXXXXXX"}
北斗星登陆
{"command":"login","ip":"XXXXXXX","port":XXXXXXX,"auth":"XXXXXXX","type":"BDX","username":"XXXXXXX","password":"XXXXXXX"}
登出
{"command":"logout"}

========查询指令 qry========
查持仓
{"command":"qry","item":"position","username":"XXXXXXX"}
{"command":"qry","item":"position_sum","username":"XXXXXXX"}
查资金
{"command":"qry","item":"fund","username":"XXXXXXX"}
查委托
{"command":"qry","item":"order","username":"XXXXXXX"}
查成交
{"command":"qry","item":"fill","username":"XXXXXXX"}

========下单指令 order========
最常见：限价、期货、日内、买入、1手
{"command":"order","item":"insert","username":"XXXXXXX","ExchangeNo":"CME","CommodityType":"F","CommodityNo":"ES","ContractNo":"2112","TimeInForce":"GFD","OrderType":"limit","OrderSide":"B","OrderPrice":4300,"OrderQty":1}
{"command":"order","item":"insert","username":"XXXXXXX","ExchangeNo":"CME","CommodityType":"F","CommodityNo":"ES","ContractNo":"2112","TimeInForce":"GTD","ExpireTime":"2021-12-31","OrderType":"limit","OrderSide":"B","OrderPrice":4300,"OrderQty":1}

我自己瞎定义的Error code：
-1000 just one client allow
-1001 Illegal JSON forma
-1002 can not find key:command
-1003 login时的各种可能错误
-1004 login repeat
-1005 urecognized command
-1006 trans command error and catch...
-1007 command can not anlysis
-1008 GET指令执行时各种可能错误
-1009 QRY指令执行时各种可能错误
-1010 ORDER指令执行时各种可能错误
-1011 SET指令执行时各种可能错误
-1012 need login 没有登录就执行各种命令
-1013 登陆失败
-1014 API未准备好
-1015 rspMsg2Client(sClient, "error", "-1015", "InsertOrder Error iErr="+ iErr); 下单失败
success code:
1000 rspMsg2Client(sockClient, "rsp", "1000", "WSServer ready"); server 准备好了
1001 rspMsg2Client(sockClient, "rsp", "1001", "received"); 收到了client的消息 回报
1002 rspMsg2Client(sockClient, "rsp","1002", "login submit"); 提交了登陆信息，回报
1003 rspMsg2Client(sockClient, "rsp","1003","logout submit"); 提交了登出信息 回报
1004 rspMsg2Client(sClient,"rsp", "1004", "OnConnect"); 提交登陆后触发了onConnect
1005 rspMsg2Client(sClient, "rsp", "1005", "OnRspLogin"); 提交登陆后触发了OnRspLogin
1006 rspMsg2Client(sClient, "rsp", "1006", "OnAPIReady")； 提交登陆后触发了OnAPIReady
1007 rspMsg2Client(sClient, "rsp", "1007", "OnDisconnect"); 登陆后触发了OnDisconnect
1008 rspMsg2Client(sClient, "rsp", "1008", "OnRspSubmitUserLoginInfo"); 启明星用
1009 rspMsg2Client(sockClient, "rsp", "1009", "qry submit"); 提交了查询的回报
1010 rspMsg2Client(sClient, "rsp", "1010", charsw); 返回查询的position信息
1011 rspMsg2Client(sClient, "rsp", "1011", charsw); 返回查询的position_sum信息
1012 rspMsg2Client(sClient, "rsp", "1012", charsw); 返回查询的fund信息
1013 rspMsg2Client(sClient, "rsp", "1013", charsw); 返回查询的order信息
1014 rspMsg2Client(sClient, "rsp", "1014", charsw); 返回查询的fill信息
1015 rspMsg2Client(sockClient, "rsp", "1015", "order submit"); 提交了订单的回报
1016 rspMsg2Client(sClient, "rsp", "1016", "order insert done"); 成功下单的回报

1 OnConnect
1 OnAPIReady
1 OnDisconnect
1 OnRspLogin
1 logout_submit

六、回顾

    其实API本身并不复杂，甚至还有点简洁，这也是为啥我后来觉得转成WS接口没有意义了，不过折腾了不短的时间，就分享给大家，也算是一个思路了，有感兴趣的可以继续加把劲丰富一下！反正我是没精力了。