c++ API将字符串转为access::Msg类型的咨询

rikytan

ema中许多消息类型的实现（如RefreshMsg、UpdateMsg、StatusMsg）均继承于access::Msg，看到class的实现中均提供了toString方法返回EmaString。如果我有一个EmaString，有什么方法可以将这个EmaString转换到access::Msg类型吗？例如我需要做一些数据回放，需要将字符串数据放到代码中处理，这时要把字符串转化到RefreshMsg、UpdateMsg、StatusMsg的消息进行处理。

Jirapongse

@rikytan

Thank you for reaching out to us.

The strings can't be converted to the EMA messages.

To record and replay data, you can use the tools mentioned in this A Quick Start Guide to Playback and Recording Data for the Refinitiv Real-Time SDK article.

rikytan

我的程序需要先将EMA message转到string存储到queue，然后又线程从queue中读取string，想把这个string再转化到EMA message来处理的。如果没有方法将string转化到EMA message，那有什么方法能够解析string获取到到想要的字段吗？

wasin.w

Hello @rikytan

Instead of keeping the message as EmaString, you can clone the message using the following method()

• refinitiv::ema::access::RefreshMsg::RefreshMsg(const RefreshMsg& other)
• refinitiv::ema::access::UpdateMsg::UpdateMsg(const UpdateMsg& other)
• refinitiv::ema::access::StatusMsg::StatusMsg(const StatusMsg& other)

Then keep the clone copy and you can parse this copied message like a normal EMA message object.

Please check mode detail on the EMA C++ Reference Manual Guide document under EMA C++ Development Guide page.

Note: The clone feature is available on the RTDK version 1.3.1 (EMA Java/C++ version 3.3.1) and above only.