网络聊天室C语言（控制台）实测有用，后续继续完善相关内容

这学期学了计算机网络，正好上年租了一台阿里云服务器，然后自己就想做一做基于控制台网络聊天程序。服务器是Linux，客户端是我们的windows。写完程序后。发现客户端总是连接超时（wireshark抓包）。并且自己在服务器那里又抓不到对应端口的包，可是我把端口又全部开放了（服务器和阿里云安全组都开放了）。却总是失败。查找了两天的问题后来在下面这篇博客发现了问题。
https://www.dechenyun.com/768.html

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define BACKLOG 5
#define MAXDATASIZE 1000

int main()
{
        int listenfd,connfd;
        struct sockaddr_in server;
        struct sockaddr_in client;
        int len,val= 1;
        char recvbuf[MAXDATASIZE]={0};
        char senbuf[MAXDATASIZE]={0};

        if((listenfd=socket(AF_INET,SOCK_STREAM,0))==-1)
        {
                perror("socket");
                exit(1);
        }

        setsockopt(listenfd,SOL_SOCKET,SO_REUSEADDR,(char*)&val,sizeof(val));

        bzero(&server,sizeof(server));
		      server.sin_family=AF_INET;
        server.sin_port=htons(27015);
        server.sin_addr.s_addr=htonl(INADDR_ANY);

        printf("-2n");
        if((bind(listenfd,(struct sockaddr *)&server,sizeof(server)))!=0)
        {
                printf("-3");
                close(listenfd);
                perror("bind");
                exit(1);
        }

        printf("-1n");
        if(listen(listenfd,BACKLOG)==-1)
        {
                perror("listen");
                exit(1);
        }

        printf("1n");
        len=sizeof(client);
        if((connfd=accept(listenfd,(struct sockaddr*)&client,&len))==-1)
        {
                perror("accept");
                exit(1);
        }
        if((len=recv(connfd,recvbuf,MAXDATASIZE,0))==-1)
        {
                perror("recv");
              }
        putchar('2');

        recvbuf[len+1]='';

        send(connfd,recvbuf,len+1,0);
        FILE*fp=fopen("1,txt","w+");
        fprintf(fp,"%s",recvbuf);
        printf("%s",recvbuf);
        putchar('3');
        close(connfd);
        close(listenfd);
        fclose(fp);
        return 0;
}
                              

#define _CRT_SECURE_NO_WARNINGS 1
#define _WINSOCK_DEPRECATED_NO_WARNINGS 1

#include 
#include 
#include 
#include 
#pragma comment(lib,"WS2_32.lib")

SOCKET servesocket,connectsocket;
sockaddr_in sockAddr;
char name[15];
char buff[1500]={0};
FILE* fp;

int main()
{
	WSADATA wsadata;
	int isok = WSAStartup(MAKEWORd(2, 2), &wsadata);
	if (isok != 0)
	{
		printf("初始化失败n");
		return -1;
	}
	servesocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	sockAddr.sin_family = AF_INET;
	sockAddr.sin_port = htons(27015);
	sockAddr.sin_addr.S_un.S_addr = inet_addr("xxx.xx.xxx.xx");//填服务器的ip地址
	

	if (connect(servesocket, (SOCKADDR*)&sockAddr, sizeof(SOCKADDR))==SOCKET_ERROR)
	{
		wprintf(L"connect function failed with error: %ldn", WSAGetLastError());
		perror("connect() error!");
		closesocket(servesocket);
		exit(1);
	}
	printf("please input your name ,less 15 charactern");
	scanf("%s", name);
	isok=send(servesocket, name, strlen(name), 0);
	

	isok = recv(servesocket, buff, sizeof(buff), 0);
	
	printf("%s", buff);
	fp=fopen("hello.txt", "a");
	if (fp == NULL)
	{
		fp = fopen("Hello.txt", "w+");
	}
	if (fp == NULL)
	{
		perror("fopen() error!");
		closesocket(servesocket);
		exit(1);
	}
	fprintf(fp, "%s",buff);
	fclose(fp);

	closesocket(servesocket);
	WSACleanup();
	
	return 0;
}