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# GetSysByteEx
### double GetSysByteEx(int nTransactionID)
SendEventReportEx 또는 SendMsgEx 함수를 호출할 때 사용자가 직접 부여한 Transaction ID를 매개체로 하여, 해당 메시지의 실제 System Byte를 조회합니다. 이 함수를 통해 코드상의 관리 번호와 실제 통신 패킷 번호를 1:1로 매칭할 수 있습니다.
{% hint style="warning" %}
GetSysByteEx() 는 반드시 사용자가 먼저 보내는 Message에 대한 SystemByte만 얻을 수 있습니다.
{% endhint %}
Parameters
```csharp
int MyTransactionID = 777; //고유 TransactionID를 설정합니다.
int lMsgId = m_gem.CreateMsg(2, 25,1);
m_gem.SendMsgEx(lMsgId, MyTransactionID); //고유 TransactionID를 넣고 Msg를 보냅니다.
double nSystemByte = m_gem.GetSysByteEx(MyTransactionID); //해당 ID로 SystemByte를 얻습니다
```
---
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