【C++】开源：数据序列化库protobuf配置与使用

# 安装
sudo apt-get install libprotobuf-dev protobuf-compiler
# 卸载
sudo apt-get autoremove --purge libprotobuf-dev protobuf-compiler

sudo apt-get install autoconf automake libtool curl make g++ unzip

https://github.com/protocolbuffers/protobuf/releases

cd protobuf
./autogen.sh
./configure
make
make check
sudo make install
sudo ldconfig

protoc –-version
pkg-config --cflags --libs protobuf

protoc test.proto --cpp_out=./	# 精简版
protoc -I=$SRC_DIR --cpp_out=$DST_DIR $SRC_DIR/test.proto	# 完整版 

message Example1 {
    optional string stringVal = 1;
    optional bytes bytesVal = 2;
    message EmbeddedMessage {
        int32 int32Val = 1;
        string stringVal = 2;
    }
    optional EmbeddedMessage embeddedExample1 = 3;
    repeated int32 repeatedInt32Val = 4;
    repeated string repeatedStringVal = 5;
}

bool,		布尔类型
double,		64位浮点数
float,		32位浮点数
int32,		32位整数
int64,		64位整数
uint64,		64位无符号整数
sint32,		32位整数，处理负数效率更高
sint64,		64位整数，处理负数效率更高
string,		只能处理ASCII字符
bytes,		用于处理多字节的语言字符
enum,		枚举类型

// $SRC_DIR: .proto 所在的源目录
// --cpp_out: 生成 c++ 代码
// $DST_DIR: 生成代码的目标目录
// xxx.proto: 要针对哪个 proto 文件生成接口代码
protoc -I=$SRC_DIR --cpp_out=$DST_DIR $SRC_DIR/xxx.proto
如：protoc student.proto --cpp_out=./

#include <iostream>
#include <fstream>
#include <string>
#include "single_length_delimited_all.pb.h"
 
int main() {
    Example1 example1;
    example1.set_stringval("hello,world");
    example1.set_bytesval("are you ok?");
 
    Example1_EmbeddedMessage *embeddedExample2 = new Example1_EmbeddedMessage();
 
    embeddedExample2->set_int32val(1);
    embeddedExample2->set_stringval("embeddedInfo");
    example1.set_allocated_embeddedexample1(embeddedExample2);
 
    example1.add_repeatedint32val(2);
    example1.add_repeatedint32val(3);
    example1.add_repeatedstringval("repeated1");
    example1.add_repeatedstringval("repeated2");
 
    std::string filename = "single_length_delimited_all_example1_val_result";
    std::fstream output(filename, std::ios::out | std::ios::trunc | std::ios::binary);
    if (!example1.SerializeToOstream(&output)) {
        std::cerr << "Failed to write example1." << std::endl;
        exit(-1);
    }
 
    return 0;
}

g++ main.cpp  student.pb.cc `pkg-config --cflags --libs protobuf` -lpthread -std=c++11

g++ -c main.cpp & g++ -c student.pb.cc -std=c++11
g++ ./main.o student.pb.o -o main_test.out `pkg-config --cflags --libs protobuf`

cmake_minimum_required(VERSION 3.5)

project(agv_cmake LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -lprotobuf  -std=c++11  -lpthread ")  
#设置编译带的参数

find_package(Protobuf REQUIRED)  #查找protobuf包

include_directories(${Protobuf_INCLUDE_DIRS})  #添加头文件
include_directories(${CMAKE_CURRENT_BINARY_DIR})  #添加头文件

include_directories(/usr/local/include)  
link_directories(/usr/local/lib)    #链接库文件

# Depend on custom defined lib

add_executable(agv_cmake main.cpp
                         nebulalink.servercwaveii.pb.cc)
target_link_libraries(agv_cmake  ${PROTOBUF_LIBRARIES})  #一定要连接库文件！！！！
qmake编译：
TEMPLATE = app
CONFIG += console c++11
CONFIG -= app_bundle
CONFIG -= qt

INCLUDEPATH += \
    /opt/ros/kinetic/include \  #ros的头文件
    /usr/local/include \        #proto所在头文件
    /usr/include/google/protobuf \

LIBS += -L/opt/ros/kinetic/lib \
        -L/usr/lib \     #proto所在库
        -L/usr/local/lib \  #proto所在库
        -L/usr/lib/x86_64-linux-gnu \
        -lpthread \
        -lprotobuf \   #proto所在库
        -lroscpp -lrospack -lrosconsole -lroscpp_serialization \
        -lrostime -lroslib -lrosconsole_log4cxx -ltf -ltf2 -ltf2_ros -lactionlib \
        -ldynamic_reconfigure_config_init_mutex -limage_transport -lcv_bridge -lclass_loader \
        -lboost_system -lboost_filesystem -lboost_thread -lboost_timer -lboost_date_time \

SOURCES += \
        main.cpp \
        student.pb.cc \