Hi Feng,
I just wrote this Github 
issue: https://github.com/google/protobuf/issues/1690
I'll look into doing it too.

-Chad

On Wednesday, June 15, 2016 at 12:57:12 PM UTC-7, Feng Xiao wrote:
>
>
>
> On Wed, Jun 15, 2016 at 8:17 AM, Chad Beaulac <cabe...@gmail.com 
> <javascript:>> wrote:
>
>> I can't find how to serialize a message directly to JSON. It seems that 
>> you have to serialize it to binary first and them to JSON and the same 
>> going in the reverse direction.
>>
>> To serialize a message to JSON I have to serialize it to binary and then 
>> output the binary to a string like this
>>
>>   std::string serialized = startMovie.SerializeAsString(); // startMovie 
>> is a google::protobuf::Message
>>   std::string json_string;
>>   
>>   // Create a TypeResolver used to resolve protobuf message types
>>   google::protobuf::util::JsonOptions options;
>>   options.always_print_primitive_fields = true;
>>   std::unique_ptr<google::protobuf::util::TypeResolver> 
>> resolver(google::protobuf::util::NewTypeResolverForDescriptorPool(
>>     "type.googleapis.com", 
>> google::protobuf::DescriptorPool::generated_pool())); 
>>   
>>   auto status = 
>> google::protobuf::util::BinaryToJsonString(resolver.get(), "
>> type.googleapis.com/movie.pbuf.Movie", serialized, &json_string, 
>> options);
>>    std::cout << "*******\n" << json_string << std::endl;
>>
>>
>> *But what I really want to do is*
>> std::string json_string = 
>> google::protobuf::util::MessageToJsonString(startMove); // startMovie is a 
>> google::protobuf::Message
>>
>>
>> And parsing from a JSON string to a Message is a two-step process also 
>> like
>>   // Turn JSON into serialized protobuf message
>>   std::string movieBin;
>>   google::protobuf::util::JsonToBinaryString(resolver.get(), "
>> type.googleapis.com/movie.pbuf.Movie", json_string, &movieBin);  
>>   
>>   Movie startMovie2;
>>   startMovie2.ParseFromString(movieBin);
>>
>> *But what I really want to do is*
>> Movie startMovie2 = google::protobuf::util::JsonToMessage("
>> type.googleapis.com/movie.pbuf.Movie", json_string);
>>
>>
>> Maybe this exists and I just haven't found it yet?
>>
> Sorry, we definitely should add these methods for convenience but just 
> don't get time for it yet. Could you help file a github issue? Or better 
> help us add these two methods?
>  
>
>>
>> Thanks,
>> Chad
>>
>>
>>
>>
>>
>>
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>
>

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