Adding fastencodedheaderanalyzer into datadestination/workingbuffer

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C++

Linux

encoding

financial

FAST counter party expecting After Encoding calculate total message length of that message and append message length before encoded bytes. So Final Bytes to send are :- Message length bytes + Message bytes. Any solution how to do this?

I'm using QuickFAST but any other library solution will also do(that will give me direction for related solution in QuickFAST)

Thanks in advance

What I have tried:

I try
QuickFAST::Codecs::DataDestination TempEncodingDestion; //temp. Data destination
TempEncodingDestion.putByte(sizeOfEncodedByte); //size of encoded bytes after encodeMessage call
for (unsigned int i = 0; i < encodingDestion.size(); i++) {
const QuickFAST::uchar* tempUcharBegin = encodingDestion[i].begin();
for (unsigned int j = 0; j < encodingDestion[i].size(); j++) {
TempEncodingDestion.putByte(*(tempUcharBegin + j));
}
}
std::string tempString;
TempEncodingDestion.toString(tempString);
std::cout << "\n tempString: " << tempString << std::endl;

and send this to receiver but Its giving me Decoding error: [ERR D9] Unknown template ID:4294967295. So I suspect my work around is not correct.
Post your solution if you found out any solution.