一：序列化

        1.fstream

// Write the new address book back to disk.

fstream output(argv[1], ios::out | ios::trunc | ios::binary);

if (!address_book.SerializeToOstream(&output)) {

cerr << "Failed to write address book." << endl;

    return -1;

}

        2.char*

方法二：

int size = address_book.ByteSize();

void *buffer = malloc(size);

address_book.SerializeToArray(buffer, size);


方法三：

使用ostringstream ，

std::ostringstream stream;

address_book.SerializeToOstream(&stream);

string text = stream.str();

char* ctext = string.c_str();

二：反序列化

        1.fstream

    // Read the existing 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 << "Failed to parse address book." << endl;

      return -1;

    }

        2.char*

address_book.ParseFromArray(char*)

三：repeated 使用

        1.添加数据

        

    mLocationInfo = mLocation.add_data();
    if(!mLocationInfo)
    {
        return;
    }

    mLocationInfo->set_cardid(cardID);
    mLocationInfo->set_sleep(speed);
    mLocationInfo->set_longitude(longitude);
    mLocationInfo->set_latitude(latitude);
    mLocationInfo->set_datatime(time);

        2.解析数据      

message LocationInfo{
    uint32 CardID=1;        
    double Longitude=2;    
    double Latitude=3;      
    float Sleep =4;  
    string Datatime=5;      
}
message Location{
    string CMD=1;   
    uint32 CarID=2; 
    repeated LocationInfo Data=3;
}

    Card::Location mLocation;
    if (mLocation.ParseFromArray(data, len) == false)//反序列化
    {
        return "ParseFromArray fail";
    }

    for (int nLoop = 0; nLoop < mLocation.data_size(); nLoop++)
    {
        Card::LocationInfo mInfo = mLocation.data(nLoop);//获取对应LocationInfo数据
    }