How to read an array of values from json file to c++ array

Question

I have a sample.json with values and an array of values. I'm currently using Json library to parse the json file and read the contents into C++ code. I know how to read a value but not sure about reading an array

Below is the content of sample.json file.

"steering_facts" :
{
    "SteerPolynomial": [0.0, 0.0, -0.0006148, 0.025, 16.24, -0.3823],
    "SteerRatio"     : 0.0
}

Here i can read "SteerRatio" with the help of below code.

static Json::Value  jsonValues;
if (jsonValues.isMember("steering_facts")){
    float steerRatio = jsonValues["steering_facts"]["SteerRatio"].asFloat();
}

But not sure how to read SteerPolynomial array.

mahbubcseju · Accepted Answer · 2019-06-19 04:30:50Z

5

You can write through the following way.

static Json::Value  jsonValues;
if (jsonValues.isMember("steering_facts")){
    float steerRatio = jsonValues["steering_facts"]["SteerRatio"].asFloat();
    const Json::Value mynames = jsonValues["steering_facts"]["SteerPolynomial"];
    for ( int index = 0; index < mynames.size(); ++index )
    {
        float poli = mynames[index].asFloat();
    }
}

answered Jun 19, 2019 at 4:30

mahbubcseju

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1 Comment

RandomGuy Over a year ago

you got it right, i implemented a similar solution and worked for me. Thank you

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