如何用scoket发送结构体

服务器端：  server.c

//
//  server.c
//  Socket
//
//  Created by zlwx on 13-11-5.
//  Copyright (c) 2013年 zlwx. All rights reserved.
//
#include <string.h>
#include<stdarg.h>
#include<sys/types.h>
#include<ctype.h>
#include<strings.h>
#include<unistd.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netdb.h>
#include<arpa/inet.h>
#include<errno.h>
#include<sys/time.h>
#include<stdio.h>
#include<string.h>
#include<sys/select.h>
#include<stdlib.h>
#include<sys/ioctl.h>
#include<syslog.h>
#include<signal.h>
#include<pthread.h>
#define SERVPORT 3333 /*服务器监听端口号 */
#define BACKLOG 10 /* 最大同时连接请求数 */

struct  TextPacket{
    int  flag;
    char fromID[24];
    char toID[24];
    char content[800];
};

int main(int argc, const char * argv[])
{
    int sockfd,client_fd; /*sock_fd：监听socket；client_fd：数据传输socket */
    pthread_t recv_thread;
    int sin_size;
    int  bufferSize=sizeof(struct TextPacket);
    struct  TextPacket recvInfo;
    char  buffer[bufferSize];
    struct sockaddr_in my_addr; /* 本机地址信息 */
    struct sockaddr_in remote_addr; /* 客户端地址信息 */
    struct sockaddr_in client_remote_addrs[100];
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket创建出错！");
        exit(1);
    }else{
        perror("socket OK!");
    }
    my_addr.sin_family=AF_INET;
    my_addr.sin_port=htons(SERVPORT);
    my_addr.sin_addr.s_addr = INADDR_ANY;
    bzero(&(my_addr.sin_zero),8);
    if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {
        perror("bind出错！");
        exit(1);
    }
    if (listen(sockfd, BACKLOG) == -1) {
        perror("listen出错！");
        exit(1);
    }  
    struct TextPacket  sendInfo;
    sendInfo.flag=1;
    memcpy(sendInfo.fromID,"ID_1",sizeof("ID_2"));
    memcpy(sendInfo.toID,"ID_ME",sizeof("ID_ME"));
    memcpy(sendInfo.content,"you are talking with me!",sizeof("you are talking with me!"));
 
        sin_size = sizeof(struct sockaddr_in);
        
    client_fd = accept(sockfd, (struct sockaddr *)(&remote_addr), &sin_size);
        if(-1 == client_fd)
        {
            printf("accept fail !\r\n");
            return -1;
        }

    while(1)
    {

        sleep(2);
        printf("accept ok!\r\nServer start get connect from %s :%u\r\n",inet_ntoa(remote_addr.sin_addr),ntohs(remote_addr.sin_port));
        if(-1 == send(client_fd,(char*)&sendInfo,sizeof(struct TextPacket),0))
        {
            printf("write fail!\r\n");
            return -1;
        }
        printf("write ok!\r\n");      
    }
    close(client_fd);
    return 0;
}

客服端：client.c

//
//  client.c
//  Client
//
//  Created by zlwx on 13-11-5.
//  Copyright (c) 2013年 zlwx. All rights reserved.
//
#include<stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>

#define SERVPORT 3333
#define MAXDATASIZE 100 /*每次最大数据传输量*/
struct  TextPacket{
       int  flag;
    char fromID[24];
    char toID[24];
    char content[800];
};


int main(int argc, const char * argv[])
{
    int sockfd, recvbytes;
    int  bufferSize=sizeof(struct TextPacket);
    char  buffer[bufferSize];
    struct  TextPacket recvInfo;
    struct hostent *host;
    struct sockaddr_in serv_addr;
    if (argc < 2) {
        fprintf(stderr,"Please enter the servers hostname! ");
        exit(1);
    }
    if((host=gethostbyname(argv[1]))==NULL) {
        herror("gethostbyname出错！");
        exit(1);
    }
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1){
        perror("socket创建出错！");
        exit(1);
    }
    serv_addr.sin_family=AF_INET;
    serv_addr.sin_port=htons(SERVPORT);
    serv_addr.sin_addr = *((struct in_addr *)host->h_addr);
    bzero(&(serv_addr.sin_zero),8);
    
        if (connect(sockfd, (struct sockaddr *)&serv_addr,sizeof(struct sockaddr)) == -1) {
            perror("connect出错！");
            exit(1);
        }
     while (1) {
        if ((recvbytes=recv(sockfd, buffer, sizeof(buffer), 0)) ==-1) {
            perror("recv出错！");
            exit(1);
        }
        memcpy(&recvInfo,buffer,sizeof(buffer));
        printf("Received: %d\n",recvInfo.flag);
        printf("recvbytes:%d-----%s",recvbytes,buffer);
    }
    close(sockfd);
    return 0;
}

测试命令：
 

       服务器端：gcc server.c -o server
                      ./server
        客户端: gcc client.c -o client
                   ./client 192.168.2.11   
注意： 192.168.2.11 是我的本机IP地址，请根据你的IP地址进行修改