C++ shared_pointer::getSubField方法代码示例

void copy_DBR_CTRL(const void * dbr, unsigned count, PVStructure::shared_pointer const & pvStructure)
{
    const T* data = static_cast<const T*>(dbr);

    PVStructure::shared_pointer alarm = pvStructure->getSubField<PVStructure>("alarm");
    alarm->getSubField<PVInt>("status")->put(0);
    alarm->getSubField<PVInt>("severity")->put(data->severity);
    alarm->getSubField<PVString>("message")->put(dbrStatus2alarmMessage[data->status]);

    PVStructure::shared_pointer disp = pvStructure->getSubField<PVStructure>("display");
    disp->getSubField<PVString>("units")->put(std::string(data->units));
    disp->getSubField<PVDouble>("limitHigh")->put(data->upper_disp_limit);
    disp->getSubField<PVDouble>("limitLow")->put(data->lower_disp_limit);

    copy_format<T>(dbr, disp);

    PVStructure::shared_pointer va = pvStructure->getSubField<PVStructure>("valueAlarm");
    std::tr1::static_pointer_cast<sF>(va->getSubField("highAlarmLimit"))->put(data->upper_alarm_limit);
    std::tr1::static_pointer_cast<sF>(va->getSubField("highWarningLimit"))->put(data->upper_warning_limit);
    std::tr1::static_pointer_cast<sF>(va->getSubField("lowWarningLimit"))->put(data->lower_warning_limit);
    std::tr1::static_pointer_cast<sF>(va->getSubField("lowAlarmLimit"))->put(data->lower_alarm_limit);

    PVStructure::shared_pointer ctrl = pvStructure->getSubField<PVStructure>("control");
    ctrl->getSubField<PVDouble>("limitHigh")->put(data->upper_ctrl_limit);
    ctrl->getSubField<PVDouble>("limitLow")->put(data->lower_ctrl_limit);

    copy_DBR<pT, sT, sF, aF>(&data->value, count, pvStructure);
}

static chtype getDBRType(PVStructure::shared_pointer const & pvRequest, chtype nativeType)
{
    // get "field" sub-structure
    PVStructure::shared_pointer fieldSubField =
            std::tr1::dynamic_pointer_cast<PVStructure>(pvRequest->getSubField("field"));
    if (!fieldSubField)
        fieldSubField = pvRequest;
    Structure::const_shared_pointer fieldStructure = fieldSubField->getStructure();

    // no fields or control -> DBR_CTRL_<type>
    if (fieldStructure->getNumberFields() == 0 ||
          fieldStructure->getField("control"))
        return static_cast<chtype>(static_cast<int>(nativeType) + DBR_CTRL_STRING);

    // display/valueAlarm -> DBR_GR_<type>
    if (fieldStructure->getField("display") || fieldStructure->getField("valueAlarm"))
        return static_cast<chtype>(static_cast<int>(nativeType) + DBR_GR_STRING);

    // timeStamp -> DBR_TIME_<type>
    // NOTE: that only DBR_TIME_<type> type holds timestamp, therefore if you request for
    // the fields above, you will never get timestamp
    if (fieldStructure->getField("timeStamp"))
        return static_cast<chtype>(static_cast<int>(nativeType) + DBR_TIME_STRING);

    // alarm -> DBR_STS_<type>
    if (fieldStructure->getField("alarm"))
        return static_cast<chtype>(static_cast<int>(nativeType) + DBR_STS_STRING);

    return nativeType;
}

int doPut_pvStructure<dbr_enum_t, pvString, PVString, PVStringArray>(CAChannel::shared_pointer const & channel, void *usrArg, PVStructure::shared_pointer const & pvStructure)
{
    bool isScalarValue = pvStructure->getStructure()->getField("value")->getType() == structure;

    if (isScalarValue)
    {
        std::tr1::shared_ptr<PVInt> value = std::tr1::static_pointer_cast<PVInt>(pvStructure->getSubField("value.index"));

        dbr_enum_t val = value->get();
        int result = ca_array_put_callback(channel->getNativeType(), 1,
                                           channel->getChannelID(), &val,
                                           ca_put_handler, usrArg);

        if (result == ECA_NORMAL)
        {
            ca_flush_io();
        }

        return result;
    }
    else
    {
        // no enum arrays in V3
        return ECA_NOSUPPORT;
    }
}

void printValue(std::string const & channelName, PVStructure::shared_pointer const & pv)
{
    if (mode == ValueOnlyMode)
    {
        PVField::shared_pointer value = pv->getSubField("value");
        if (value.get() == 0)
        {
            std::cerr << "no 'value' field" << std::endl;
            //std::cout << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
            pvutil_ostream myos(std::cout.rdbuf());
            myos << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
        }
        else
        {
            Type valueType = value->getField()->getType();
            if (valueType != scalar && valueType != scalarArray)
            {
                // switch to structure mode, unless it's T-type
                if (valueType == structure && isTType(static_pointer_cast<PVStructure>(value)))
                {
                    std::cout << std::setw(30) << std::left << channelName;
                    std::cout << fieldSeparator;
                    formatTType(std::cout, static_pointer_cast<PVStructure>(value));
                    std::cout << std::endl;
                }
                else
                {
                    //std::cout << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
                    pvutil_ostream myos(std::cout.rdbuf());
                    myos << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
                }
            }
            else
            {
                if (fieldSeparator == ' ' && value->getField()->getType() == scalar)
                    std::cout << std::setw(30) << std::left << channelName;
                else
                    std::cout << channelName;

                std::cout << fieldSeparator;

                terse(std::cout, value) << std::endl;
            }
        }
    }
    else if (mode == TerseMode)
        terseStructure(std::cout, pv) << std::endl;
    else
    {
        //std::cout << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
        pvutil_ostream myos(std::cout.rdbuf());
        myos << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
    }
}

void copy_DBR<dbr_long_t, pvInt, PVInt, PVIntArray>(const void * dbr, unsigned count, PVStructure::shared_pointer const & pvStructure)
{
    if (count == 1)
    {
        std::tr1::shared_ptr<PVInt> value = std::tr1::static_pointer_cast<PVInt>(pvStructure->getSubField("value"));
        value->put(static_cast<const int32*>(dbr)[0]);
    }
    else
    {
        std::tr1::shared_ptr<PVIntArray> value =
                std::tr1::static_pointer_cast<PVIntArray>(pvStructure->getScalarArrayField("value", pvInt));
        PVIntArray::svector temp(value->reuse());
        temp.resize(count);
        std::copy(static_cast<const int32*>(dbr), static_cast<const int32*>(dbr) + count, temp.begin());
        value->replace(freeze(temp));
    }
}

void copy_DBR(const void * dbr, unsigned count, PVStructure::shared_pointer const & pvStructure)
{
    if (count == 1)
    {
        std::tr1::shared_ptr<sF> value = std::tr1::static_pointer_cast<sF>(pvStructure->getSubField("value"));
        value->put(static_cast<const pT*>(dbr)[0]);
    }
    else
    {
        std::tr1::shared_ptr<aF> value =
                std::tr1::static_pointer_cast<aF>(pvStructure->getScalarArrayField("value", sT));
        typename aF::svector temp(value->reuse());
        temp.resize(count);
        std::copy(static_cast<const pT*>(dbr), static_cast<const pT*>(dbr) + count, temp.begin());
        value->replace(freeze(temp));
    }
}

int doPut_pvStructure(CAChannel::shared_pointer const & channel, void *usrArg, PVStructure::shared_pointer const & pvStructure)
{
    bool isScalarValue = pvStructure->getStructure()->getField("value")->getType() == scalar;

    if (isScalarValue)
    {
        std::tr1::shared_ptr<sF> value = std::tr1::static_pointer_cast<sF>(pvStructure->getSubField("value"));

        pT val = value->get();
        int result = ca_array_put_callback(channel->getNativeType(), 1,
                                           channel->getChannelID(), &val,
                                           ca_put_handler, usrArg);

        if (result == ECA_NORMAL)
        {
            ca_flush_io();
        }

        return result;
    }
    else
    {
        std::tr1::shared_ptr<aF> value =
                std::tr1::static_pointer_cast<aF>(pvStructure->getScalarArrayField("value", sT));

        const pT* val = value->view().data();
        int result = ca_array_put_callback(channel->getNativeType(), static_cast<unsigned long>(value->getLength()),
                                           channel->getChannelID(), val,
                                           ca_put_handler, usrArg);

        if (result == ECA_NORMAL)
        {
            ca_flush_io();
        }

        return result;
    }
}

void copy_DBR<string, pvString, PVString, PVStringArray>(const void * dbr, unsigned count, PVStructure::shared_pointer const & pvStructure)
{
    if (count == 1)
    {
        std::tr1::shared_ptr<PVString> value = std::tr1::static_pointer_cast<PVString>(pvStructure->getSubField("value"));
        value->put(std::string(static_cast<const char*>(dbr)));
    }
    else
    {
        std::tr1::shared_ptr<PVStringArray> value =
                std::tr1::static_pointer_cast<PVStringArray>(pvStructure->getScalarArrayField("value", pvString));
        const dbr_string_t* dbrStrings = static_cast<const dbr_string_t*>(dbr);
        PVStringArray::svector sA(value->reuse());
        sA.resize(count);
        std::copy(dbrStrings, dbrStrings + count, sA.begin());
        value->replace(freeze(sA));
    }
}

int doPut_pvStructure<string, pvString, PVString, PVStringArray>(CAChannel::shared_pointer const & channel, void *usrArg, PVStructure::shared_pointer const & pvStructure)
{
    bool isScalarValue = pvStructure->getStructure()->getField("value")->getType() == scalar;

    if (isScalarValue)
    {
        std::tr1::shared_ptr<PVString> value = std::tr1::static_pointer_cast<PVString>(pvStructure->getSubField("value"));

        string val = value->get();
        int result = ca_array_put_callback(channel->getNativeType(), 1,
                                           channel->getChannelID(), val.c_str(),
                                           ca_put_handler, usrArg);

        if (result == ECA_NORMAL)
        {
            ca_flush_io();
        }

        return result;
    }
    else
    {
        std::tr1::shared_ptr<PVStringArray> value =
                std::tr1::static_pointer_cast<PVStringArray>(pvStructure->getScalarArrayField("value", pvString));

        PVStringArray::const_svector stringArray(value->view());

        size_t arraySize = stringArray.size();
        size_t ca_stringBufferSize = arraySize * MAX_STRING_SIZE;
        char* ca_stringBuffer = new char[ca_stringBufferSize];
        memset(ca_stringBuffer, 0, ca_stringBufferSize);

        char *p = ca_stringBuffer;
        for(size_t i = 0; i < arraySize; i++)
        {
            string value = stringArray[i];
            size_t len = value.length();
            if (len >= MAX_STRING_SIZE)
                len = MAX_STRING_SIZE - 1;
            memcpy(p, value.c_str(), len);
            p += MAX_STRING_SIZE;
        }


        int result = ca_array_put_callback(channel->getNativeType(), arraySize,
                                           channel->getChannelID(), ca_stringBuffer,
                                           ca_put_handler, usrArg);
        delete[] ca_stringBuffer;

        if (result == ECA_NORMAL)
        {
            ca_flush_io();
        }

        return result;
    }
}