MessageToJsonString() throws std::system_error

[A]

I'm trying to dump the protobuf message object using MessageToJsonString() function but encountering an exception. Sample code is as below followed by the output without try{}catch()




ResultRecord* GetSampleData()
{
    auto resultRecord = std::make_unique<ResultRecord>();
    ....
    //Filling resultRecord
    ....
    return resultRecord.release();
}
int main(int, char**) {

    //Getting RecordData through Protobuf
    auto data = GetSampleData();

    if(data){
        std::string str;
        google::protobuf::util::JsonOptions opts;
        opts.add_whitespace = true;
        try{
            google::protobuf::util::MessageToJsonString(*(data), &str, opts);
        }
        catch(std::exception e)
        {
            std::cout<< e.what()<<std::endl;
        }
        std::cout<<str<<std::endl;
    }
    return 0;
}

Output :

terminate called after throwing an instance of 'std::system_error'
  what():  Unknown error -1

I'm not sure what to do to debug this. Can someone point me in right direction ?

[Adam Cozzette]

I replied on your GitHub issue here: https://github.com/protocolbuffers/protobuf/issues/6479

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