Sword protobuf学习三

#include <iostream>
#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "test.pb.h"   /* 这是proto文件生成的头文件 */

#include "include/google/protobuf/map.h"/* protobuf提供的map数据结构 */

using namespace std;

int connect_server()
{
    int fd = 0;
    struct sockaddr_in addr;
    int len = 0;
    char *pcData = NULL;
    long fileSize = 0;

    fd = socket(AF_INET, SOCK_STREAM, 0);
    if (fd < 0)
    {
        printf("socket() failed .
");
        return -1;
    }

    memset(&addr, 0, sizeof(struct sockaddr_in));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(8888);
    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    if (connect(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)))
    {
        printf("connect() failed .
");
        return -1;
    }

    commun::Say msg;
    
    //基本类型参数的赋值
    msg.set_code(13);    //数值型
    msg.set_data("this is the last chance, go ,do not hesitate .
");  //字符串类型

    //读一个音频文件
    readAudio("../audio/test.wav", &pcData,&fileSize);
    //非字符串型字符数据赋值(例如音频文件)
    //注意需要加size,不然传过去就是字符串,字符串是以0结尾的
    msg.set_audio(pcData, fileSize);
    msg.set_filesize(fileSize);

    //数组类型参数的赋值--proto文件中repeated修饰的变量
    msg.add_name("feng");
    msg.add_name("yu");
    msg.add_name("lei");
    msg.add_name("dian");

    //map类型参数的赋值
    using MapPair = google::protobuf::MapPair<google::protobuf::int32, string>;

    msg.mutable_projects()->insert(MapPair(0, "tom"));
    msg.mutable_projects()->insert(MapPair(1, "jack"));
    msg.mutable_projects()->insert(MapPair(2, "dong"));


    len = htonl(msg.ByteSize());

    //msg.ByteSize()获取消息结构的大小
    char *buffer = (char *)malloc(msg.ByteSize()+4);
    memset(buffer, 0, msg.ByteSize() + 4);
    //存放消息结构的大小
    memcpy(buffer, &len, sizeof(int));
    //将消息msg序列化到buffer中
    //也可以使用SerializeToString()函数来序列化字符串,但是估计没啥应用场景
    //ParseFromString()反序列化字符串
    //ParseFromArray()反序列化字符数组
    msg.SerializeToArray(buffer + 4, msg.ByteSize());

    send(fd, buffer, msg.ByteSize()+4, 0);

    free(buffer);

    sleep(30);

    close(fd);

    return 0;

}
原文地址:https://www.cnblogs.com/zhanggaofeng/p/9689581.html