socket编程的有关问题，为什么运行失败呢

socket编程的问题，为什么运行失败呢？
server端：

C/C++ code

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <memory>
#include <arpa/inet.h>
#include "error.h"
int main()
{
    int sockfd,client_fd;/*sockfd:  monitor socket;  client_fd:data transmission socket*/
    struct sockaddr_in my_addr;/*local host address  message*/
    struct sockaddr_in remote_addr;/*client address message*/
    int ret;
    do
    {
        if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
        {
            ret=SOCKER_GREAT_ERROR;
            break;
        }
    my_addr.sin_family=AF_INET;
    my_addr.sin_port=htons(SERVERPORT);
    my_addr.sin_addr.s_addr = INADDR_ANY;
    memset(my_addr.sin_zero,0,sizeof(my_addr.sin_zero));

        if(bind(sockfd,(struct sockaddr*)&my_addr,sizeof(struct sockaddr))==-1)
        {
            ret=BIND_ERROR;
            break;
        }

        if(listen(sockfd,BACKLOG)==-1)
        {
            ret=LISTEN_ERROR;
            break;
        }

        while(1)
        {
            socklen_t  sin_size=sizeof(struct sockaddr);
            if((client_fd=accept(sockfd,(struct sockaddr*)&remote_addr,&sin_size))==-1)
            {
                ret=ACCEPT_ERROR;
                break;
            }

            printf("received a connection from %s\n", inet_ntoa(remote_addr.sin_addr));
            if (!fork()) 
            { 
                if (send(client_fd, "Hello, you are connected!\n", 26, 0) == -1)
                {
                    ret=SEND_ERROR;
                }
                close(client_fd);
                exit(0);
            }

        }
        
    }while(0);
    if(0!=ret)
        printf("run error with %d\n",ret);
    return ret;
}

client端：

C/C++ code

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <memory>
#include <arpa/

为什么运行client端程序时会报内存错误呢？运行方式为 ./client <hostname>
有什么问题吗？

------解决方案--------------------
好像没看见你初始化
------解决方案--------------------
if((host=gethostbyname(argv[1]))=NULL)
编码归范呀，
if((host=gethostbyname(argv[1]))==NULL)

------解决方案--------------------
Windows下需要初始化
The following code fragment demonstrates how an application that supports only version 2.2 of Windows Sockets makes a WSAStartup call:

WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD( 2, 2 );

err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
/* Tell the user that we could not find a usable */
/* WinSock DLL. */
return;
}

/* Confirm that the WinSock DLL supports 2.2.*/
/* Note that if the DLL supports versions greater */
/* than 2.2 in addition to 2.2, it will still return */
/* 2.2 in wVersion since that is the version we */
/* requested. */

if ( LOBYTE( wsaData.wVersion ) != 2 ||
HIBYTE( wsaData.wVersion ) != 2 ) {
/* Tell the user that we could not find a usable */
/* WinSock DLL. */
WSACleanup( );
return;
}

socket编程的有关问题，为什么运行失败呢

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