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 > 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
>> 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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