#include <iostream>
#include <fstream>
#include <istream>
#include <string>#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>
#include <google/protobuf/util/json_util.h>#include <fcntl.h>
#include <unistd.h>#include "game.pb.h"void serializeToString(pt::rsp_login& rsp)
{//序列化到字符串和从字符串解析数据std::string str{};rsp.SerializeToString(&str);std::cout << "serialize to string:" << str << std::endl;pt::rsp_login rsp2{};rsp2.ParseFromString(str);std::cout << "parse from string size:" << rsp2.ByteSize() << std::endl;auto temp_str = rsp.SerializeAsString();std::cout << "serialize as string:" << temp_str << std::endl;
}void serializeToArray(pt::rsp_login& rsp)
{//序列化到数组和从数组解析数据std::vector<uint8_t> buff;buff.resize(rsp.ByteSize());rsp.SerializeToArray(buff.data(), buff.size());pt::rsp_login rsp2{};if (!rsp2.ParseFromArray(buff.data(), (int)buff.size())) {std::cout << "parse error\n";}std::cout << "parse from array size:" << rsp2.ByteSize() << std::endl;
}void serializeToCodeStream(pt::rsp_login& rsp)
{using namespace google::protobuf::io;int fd1 = open("myfile", O_CREAT | O_RDWR);if (fd1 == -1) {return;}ZeroCopyOutputStream *raw_output = new FileOutputStream(fd1);google::protobuf::io::CodedOutputStream coded_output(raw_output);rsp.SerializeToCodedStream(&coded_output);delete raw_output;close(fd1);pt::rsp_login rsp2{};int fd2 = open("myfile", O_RDONLY);if (fd2 == -1) {return;}ZeroCopyInputStream *raw_input = new FileInputStream(fd2);google::protobuf::io::CodedInputStream coded_input(raw_input);rsp2.ParseFromCodedStream(&coded_input);delete raw_input;close(fd2);
}void serializeToStream(pt::rsp_login& rsp)
{std::fstream fs1("stream.info", std::ios::out | std::ios::binary);rsp.SerializeToOstream(&fs1);fs1.close();pt::rsp_login rsp2{};std::fstream fs2("stream.info", std::ios::in | std::ios::binary);rsp2.ParseFromIstream(&fs2);fs2.close();std::cout << "parse in stream:" << rsp2.ByteSize() << std::endl;
}void serializeToFile(pt::rsp_login& rsp)
{//序列化到文件
    std::ofstream ofile;auto fd = open("game.info", O_CREAT | O_TRUNC | O_RDWR, 0644);if (fd <= 0) {std::cout << "open file error" << std::endl;return;}rsp.SerializeToFileDescriptor(fd);close(fd);pt::rsp_login rsp2{};fd = open("game.info", O_RDONLY);if (fd <= 0) {std::cout << "serialize to file error" << std::endl;return;}rsp2.ParseFromFileDescriptor(fd);close(fd);std::cout << "parse from file rsp2.size:" << rsp2.ByteSize() << std::endl;
}void jsonMessageConvent(pt::rsp_login& rsp)
{//如果字段值=protobuf中的类型默认值,则此字段不会转换到Json字符串中std::string json{};google::protobuf::util::MessageToJsonString(rsp, &json);std::cout << "message to json:" << json << std::endl;//json字符串中字段的值=protobuf中字段类型默认值,则此json字段不会转换到protobuf消息中
    pt::rsp_login rsp2{};google::protobuf::util::JsonStringToMessage(json, &rsp2);std::cout << "json to message size:" << rsp2.ByteSize() << std::endl;
}int main()
{pt::rsp_login rsp{};rsp.set_ret(pt::rsp_login_RET_SUCCESS);auto user_info = rsp.mutable_user_info();user_info->set_nickname("dsw");user_info->set_icon("345DS55GF34D774S");user_info->set_coin(2000);user_info->set_location("zh");for (int i = 0; i < 5; i++) {auto record = rsp.add_record();record->set_time("2017/4/13 12:22:11");record->set_kill(i * 4);record->set_dead(i * 2);record->set_assist(i * 5);}serializeToString(rsp);serializeToArray(rsp);serializeToCodeStream(rsp);serializeToStream(rsp);serializeToFile(rsp);jsonMessageConvent(rsp);return 0;
}