protobuf反射

#include <iostream>
#include <google/protobuf/compiler/importer.h>
#include <google/protobuf/dynamic_message.h>

class MyErrorCollector: public google::protobuf::compiler::MultiFileErrorCollector
{
    virtual void AddError(const std::string & filename, int line, int column, const std::string & message){
        // define import error collector
        printf("%s, %d, %d, %s\n", filename.c_str(), line, column, message.c_str());
    }
};

int main()
{
	google::protobuf::compiler::DiskSourceTree sourceTree;
	MyErrorCollector errorCollector;

	sourceTree.MapPath("","/usr/local/include/");//test.proto中有可能引用其他庫
	sourceTree.MapPath("","./");
	google::protobuf::compiler::Importer importer(&sourceTree, &errorCollector);
	importer.Import("test.proto");
	auto descriptor1 = importer.pool()->FindMessageTypeByName("T.Test");
	if(descriptor1 == nullptr)
	{
		std::cout << "descriptor1 is null" << std::endl;
		return 0;
	}
	google::protobuf::DynamicMessageFactory factory;
	auto proto1 = factory.GetPrototype(descriptor1);
	auto message1= proto1->New();
	auto reflection1 = message1->GetReflection();
	
	auto filed1 = descriptor1->FindFieldByName("id");
	reflection1->SetInt32(message1,filed1,1);
	std::cout << message1->DebugString();
	
	auto filed2 = descriptor1->FindFieldByName("name");
	reflection1->SetString(message1,filed2,"adfafafdafaf");
	std::cout << message1->DebugString();


	delete message1 ;
	return 0 ;
}
//g++ -g -std=c++0x -o a.out reflect.cpp -lpthread -lprotobuf 

/*
syntax = "proto2";

package T;
message Test
{
    optional int32 id = 1;
}
*/

原文：https://blog.csdn.net/cchd0001/article/details/52452204