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我尝试使用protobuf编译器解析.proto文件。但是,这是一个令人困惑的问题,我无法获得方法的选项。如何从protobuf描述符中获取方法选项?
看来我的选项被视为“未知字段”而不是选项。
有什么办法可以解决这个问题吗?谢谢。
(我讨厌在这里贴了很多代码,但我认为这是必要的,充分说明问题很抱歉的说。)
(ENV:G ++ 4.7,Ubuntu的16.04,的Protobuf 3.0.0)
#include <google/protobuf/descriptor.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/dynamic_message.h>
#include <google/protobuf/compiler/importer.h>
using namespace std;
using namespace google::protobuf;
using namespace google::protobuf::compiler;
#define print(x) std::cout << x << std::endl
#define input(x) std::cin >> x
int main() {
DiskSourceTree sourceTree;
sourceTree.MapPath("", "./");
sourceTree.MapPath("", "./protobuf/include/");
Importer importer(&sourceTree, NULL);
auto fd = importer.Import("example.proto");
assert(fd);
int service_count = fd->service_count();
for (int i = 0; i < service_count; i++) {
auto service_d = fd->service(i);
int method_count = service_d->method_count();
for (int j = 0; j < method_count; j++) {
auto method_d = service_d->method(j);
print(method_d->options().unknown_fields().field_count());$
print(">> " << method_d->options().uninterpreted_option_size());
}
}
return 0;
}
// lrpc.proto
syntax = "proto3";
package lrpc;
import "google/protobuf/descriptor.proto";
extend google.protobuf.MethodOptions {
int32 CmdID = 50000;
string OptString = 50001;
string Usage = 50002;
}
// example.proto
syntax = "proto3";
package foobar;
import "google/protobuf/wrappers.proto";
import "google/protobuf/empty.proto";
import "lrpc.proto";
message SearchRequest {
// ...
}
message SearchResponse {
// ...
}
service SearchService {
rpc Search(SearchRequest) returns(SearchResponse) {
option(lrpc.CmdID) = 1;
}
}