ProtoBuf 常用序列化/反序列化API

1、C数组的序列化和反序列化API

//C数组的序列化和序列化API
bool ParseFromArray(const void* data, int size);
bool SerializeToArray(void* data, int size) const;
//使用
void set_people()             
{
    wp.set_name("sealyao");   
    wp.set_id(123456);        
    wp.set_email("[e-mail]");
    wp.SerializeToArray(parray,256);
}

void get_people()             
{
    rap.ParseFromArray(parray,256);
    cout << "Get People from Array:" << endl;
    cout << "\t Name : " <<rap.name() << endl;
    cout << "\t Id : " << rap.id() << endl;
    cout << "\t email : " << rap.email() << endl;
}

2、C++ String的序列化和反序列化API

//C++string序列化和序列化API
bool SerializeToString(string* output) const;
bool ParseFromString(const string& data);
//使用：
void set_people()             
{
    wp.set_name("sealyao");   
    wp.set_id(123456);        
    wp.set_email("[e-mail]");
    wp.SerializeToString(&pstring);
}

void get_people()             
{
    rsp.ParseFromString(pstring);  
    cout << "Get People from String:" << endl;
    cout << "\t Name : " <<rsp.name() << endl;
    cout << "\t Id : " << rsp.id() << endl;
    cout << "\t email : " << rsp.email() << endl;
}

3、文件描述符序列化和反序列化API

 //文件描述符的序列化和序列化API
 bool SerializeToFileDescriptor(int file_descriptor) const;
 bool ParseFromFileDescriptor(int file_descriptor);

 //使用:
void set_people()
{
    fd = open(path,O_CREAT|O_TRUNC|O_RDWR,0644);
    if(fd <= 0){
        perror("open");
        exit(0); 
    }   
    wp.set_name("sealyaog");
    wp.set_id(123456);
    wp.set_email("[e-mail]");
    wp.SerializeToFileDescriptor(fd);   
    close(fd);
}

void get_people()
{
    fd = open(path,O_RDONLY);
    if(fd <= 0){
        perror("open");
        exit(0);
    }
    rp.ParseFromFileDescriptor(fd);
    std::cout << "Get People from FD:" << endl;
    std::cout << "\t Name : " <<rp.name() << endl;
    std::cout << "\t Id : " << rp.id() << endl;
    std::cout << "\t email : " << rp.email() << endl;
    close(fd);
}

4、C++  stream 序列化和反序列化API

//C++ stream 序列化/反序列化API
bool SerializeToOstream(ostream* output) const;
bool ParseFromIstream(istream* input);

//使用：
void set_people()
{
    fstream fs(path,ios::out|ios::trunc|ios::binary);
    wp.set_name("sealyaog");
    wp.set_id(123456);
    wp.set_email("[e-mail]");
    wp.SerializeToOstream(&fs);    
    fs.close();
    fs.clear();
}

void get_people()
{
    fstream fs(path,ios::in|ios::binary);
    rp.ParseFromIstream(&fs);
    std::cout << "\t Name : " <<rp.name() << endl;
    std::cout << "\t Id : " << rp.id() << endl; 
    std::cout << "\t email : " << rp.email() << endl;   
    fs.close();
    fs.clear();
}