Linux下protobuf的安装过程&简单使用。 protobuf是google开发的一个灵活的、高效的用于序列化数据的协议。相比较XML和JSON格式，protobuf更小、更快、更便捷。
安装
下载链接：https://github.com/protocolbuffers/protobuf/releases ，我是用c ，所以下载protobuf-cpp就行了。
tar -xzvf protobuf-*.tar.gz
cd protobuf-*
./configure –prefix=/usr/local/protobuf
make (可能会等好一段时间)
make check
make install
vim /etc/profile
代码语言：javascript复制export PATH=$PATH:/usr/local/protobuf/bin/
export PKG_CONFIG_PATH=/usr/local/protobuf/lib/pkgconfig/source /etc/profile
protoc –version #测试是否安装成功
使用方法
代码语言：javascript复制cd ~/testvim address.proto
代码语言：javascript复制package tutorial;
message Persion {
required string name = 1;
required int32 age = 2;
}
message AddressBook {
repeated Persion persion = 1;
}protoc -I=. –cpp_out=. address.proto #在当前文件夹生成cpp的.h和.cc文件
vim write.cpp
代码语言：javascript复制#include <iostream>
#include <fstream>
#include <string>
#include "address.pb.h"
using namespace std;
void PromptForAddress(tutorial::Persion *persion) {
cout << "Enter persion name:" << endl;
string name;
cin >> name;
persion->set_name(name);
int age;
cin >> age;
persion->set_age(age);
}
int main(int argc, char **argv) {
//GOOGLE_PROTOBUF_VERIFY_VERSION;
if (argc != 2) {
cerr << "Usage: " << argv[0] << " ADDRESS_BOOL_FILE" << endl;
return -1;
}
tutorial::AddressBook address_book;
{
fstream input(argv[1], ios::in | ios::binary);
if (!input) {
cout << argv[1] << ": File not found. Creating a new file." << endl;
}
else if (!address_book.ParseFromIstream(&input)) {
cerr << "Filed to parse address book." << endl;
return -1;
}
}
// Add an address
PromptForAddress(address_book.add_persion());
{
fstream output(argv[1], ios::out | ios::trunc | ios::binary);
if (!address_book.SerializeToOstream(&output)) {
cerr << "Failed to write address book." << endl;
return -1;
}
}
// Optional: Delete all global objects allocated by libprotobuf.
//google::protobuf::ShutdownProtobufLibrary();
return 0;
}read.cpp
代码语言：javascript复制#include <iostream>
#include <fstream>
#include <string>
#include "address.pb.h"
using namespace std;
void ListPeople(const tutorial::AddressBook& address_book) {
for (int i = 0; i < address_book.persion_size(); i ) {
const tutorial::Persion& persion = address_book.persion(i);
cout << persion.name() << " " << persion.age() << endl;
}
}
int main(int argc, char **argv) {
//GOOGLE_PROTOBUF_VERIFY_VERSION;
if (argc != 2) {
cerr << "Usage: " << argv[0] << " ADDRESS_BOOL_FILE" << endl;
return -1;
}
tutorial::AddressBook address_book;
{
fstream input(argv[1], ios::in | ios::binary);
if (!address_book.ParseFromIstream(&input)) {
cerr << "Filed to parse address book." << endl;
return -1;
}
input.close();
}
ListPeople(address_book);
// Optional: Delete all global objects allocated by libprotobuf.
//google::protobuf::ShutdownProtobufLibrary();
return 0;
}编译两个文件
代码语言：javascript复制g address.pb.cc write.cpp -o write `pkg-config --cflags --libs protobuf`
g address.pb.cc read.cpp -o read `pkg-config --cflags --libs protobuf`运行
代码语言：javascript复制./write data.txt
aaa 999
./read data.txt
aaa 999问题
运行write时，提示找不到动态链接库
代码语言：javascript复制添加安装路径下的lib路径
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/protobuf/lib编码示例
代码语言：javascript复制package test
message hello {
int32 id = 1;//id=300
string str = 2;//str="hello"
}
key 1 >> 1000|0 >> 1000 >> 08
yield 300 >> 0010 010 1100 >> 010 1100 000 0010 >> 1010 1100 0000 0010 >> ac 02
key 2 >> 10000|10 >> 0001 0010 >> 12
yield hello 长度05
>> 68 65 6c 6c 6f
>> 01101000 01100101 01101100 01101100 01101111
>>
result: 08 ac 02 12 05 68 65 6c 6c 6f参考
- https://www.ibm.com/developerworks/cn/linux/l-cn-gpb/
- https://www.cnblogs.com/luoxn28/p/5303517.html
- https://developers.google.com/protocol-buffers/docs/cpptutorial
- https://www.cnblogs.com/silvermagic/p/9087593.html
- Protobuf通信协议详解：代码演示、详细原理介绍等
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