Function CP_get_mixture_binary_pair_data

wrappers/MathCAD/CoolPropMathcad.cpp:660–687

this code executes the user function CP_get_mixture_binary_pair_data, which is a wrapper for the CoolProp.get_mixture_binary_pair_data() function, used to get the requested binary pair interaction parameter (always returned as a string).

// the CoolProp.get_mixture_binary_pair_data() function, used to get the requested binary pair
// interaction parameter (always returned as a string).
static LRESULT CP_get_mixture_binary_pair_data(LPMCSTRING Value,  // output string (string contains value of parameter)
                                               LPCMCSTRING CAS1,  // First component
                                               LPCMCSTRING CAS2,  // Second component
                                               LPCMCSTRING Key)   // name of the binary pair parameter (string) to retrieve
{
    std::string s;
    // Invoke the std::string form of get_global_param_string() function, save result to a new string s
    try {
        s = CoolProp::get_mixture_binary_pair_data(CAS1->str, CAS2->str, Key->str);
    } catch (const CoolProp::ValueError& e) {
        std::string emsg(e.what());
        CoolProp::set_error_string(emsg);
        if (emsg.find("parameter") != std::string::npos)
            return MAKELRESULT(BAD_PARAMETER, 3);
        else if (emsg.find("binary pair") != std::string::npos)
            return MAKELRESULT(BAD_BINARY_PAIR, 1);
        else
            return MAKELRESULT(UNKNOWN, 1);
    }

    // Must use MathcadAllocate(size) so Mathcad can track and release, using Helper routine above
    char* c = AllocMathcadString(s);
    // assign the string to the function's output parameter
    Value->str = c;

    // normal return
    return 0;
}

// Helper: centralize check for predefined-mixture-not-found error messages
static inline bool PredefinedMixtureNotFound(const std::string& emsg) {