decode of just encoded object in EMA C++

ye.li
ye.li Explorer
in EMA

I have a C++ application that subscribe to other data, convert some of the fields to EMA data field and post to TRCC. I added those fields to a FieldList.

I want to print out the fields in the Fieldlist for sanity check on how the conversion works and keep a record of what is posted to TRCC. But if I run FieldList::toString() or other get functions, it complains that "Decoding of just encoded object in the same application is not supported". Is there an easier way to do decoding in the same application?

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Best Answer

  • veerapath.rungruengrayubkul
    veerapath.rungruengrayubkul LSEG
    Answer ✓

    Hi @ye.li,

    I have found a method in the EMA C++ UnitTest application provided in the EMA C++ package to decode just encoded FieldList in EMA application using StaticDecoder class. Below is the sample code.

    #include "Access/Impl/StaticDecoder.h" ...
    FieldList fl;
    fl.addReal(25, 80, OmmReal::ExponentPos1Enum);
    fl.complete();

    StaticDecoder::setData(&fl, &dictionary);
    while (fl.forth()) 
    {    
        const FieldEntry& fe = fl.getEntry();
        cout << "Name: " << fe.getName() << " Value: ";
        cout << fe.toString() << endl; 
    }

    The StaticDecoder::setData() requires RsslDataDictionary object which required dictionary data loaded from local dictionary files (RDMFIeldDictionary, enumtype.def) first.

    RsslDataDictionary dictionary;
    loadDictionaryFromFile(&dictionary);

    loadDictionaryFromFile() code

    bool loadDictionaryFromFile(RsslDataDictionary* pDictionary)
    {
        RsslBool fieldDictionaryLoaded = RSSL_FALSE, enumTableLoaded = RSSL_FALSE;
        char errTxt[256];
        RsslBuffer errorText = { 255, (char*)errTxt };

        const char* fieldDictionaryFileName = "RDMFieldDictionary";
        const char* enumTableFileName = "enumtype.def";

        rsslClearDataDictionary(pDictionary);

        if (rsslLoadFieldDictionary(fieldDictionaryFileName, pDictionary, &errorText) < 0)
            cout << "\nUnable to load field dictionary.\n\tError Text: " << errorText.data << endl;
        else
            fieldDictionaryLoaded = RSSL_TRUE;

        if (rsslLoadEnumTypeDictionary(enumTableFileName, pDictionary, &errorText) < 0)
            cout << "\nUnable to load enum type dictionary.\n\tError Text: " << errorText.data << endl;
        else
            enumTableLoaded = RSSL_TRUE;

        if (fieldDictionaryLoaded && enumTableLoaded)
        {
            return true;
        }
        else
        {
            rsslDeleteDataDictionary(pDictionary);

            return false;
        }
    }

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