Yeap.finally I found out that the service keyword is not implemented by the 
protobuf but by the grpc.I should install the plugin first . Thanks. @Feng 
Xiao

On Thursday, July 9, 2015 at 5:18:01 AM UTC+8, Feng Xiao wrote:
>
>
>
> On Wed, Jul 8, 2015 at 5:22 AM, cilen <cile...@gmail.com <javascript:>> 
> wrote:
>
>> syntax = "proto3";
>>
>> package helloworld;
>>
>> option java_multiple_files = true;
>> option java_package = "io.grpc.examples.helloworld";
>> option java_outer_classname = "HelloWorldProto";
>>
>> // The greeting service definition.
>> service Greeter {
>>   rpc SayHello (HelloRequest) returns (HelloResponse) {}
>> }
>>
>> // The request message containing the user's name.
>> message HelloRequest {
>>   string name = 1;
>> }
>>
>> // The response message containing the greetings
>> message HelloResponse {
>>   string message = 1;
>> }
>>
>>
>> I save the above file into the helloworld.proto
>> then I do the compiling,
>>  --- the output files contains all the information about HelloRequest 
>> HelloResponse
>> But without any useful interface information about the Greeter.
>>
>>
>> Should I do the interface coding myself in Proto3(libprotoc 3.0.0) ,or 
>> something is wrong for my config or protoc installation
>>
> Sorry, I just realized you are actually compiling the grpc example proto 
> file so you are already using grpc.
>
> The protoc compiler itself does not produce grpc outputs for service. You 
> need to install the grpc plugins for the language you are using and invoke 
> protoc with the plugin. For example, you may invoke protoc like this:
>
> $ protoc -I ../../protos/ --grpc_out=. 
> --plugin=protoc-gen-grpc=grpc_cpp_plugin ../../protos/helloworld.proto
>
>
> See the grpc example in C++: http://www.grpc.io/docs/installation/c.html
>  
>
>>  
>>
>>
>>
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