C/C++下TCP, 服务器/客户端 "多人聊天室"

原文地址：https://www.cnblogs.com/imwtr/p/4072452.html

本次实验利用TCP/IP, 语言环境为 C/C++

利用套接字Socket编程，以及线程处理，

实现Server/CLient 之间多人的聊天系统的基本功能。

结果大致如：

 

 

下面贴上代码（参考参考...)

Server 部分：

 

/* TCPdtd.cpp - main, TCPdaytimed */

#include 
#include 
#include 
#include 
#include "conio.h"
#include 
#include 
#include 

#define QLEN       5
#define    WSVERS    MAKEWORD(2, 0)
#define    BUFLEN    2000             // 缓冲区大小
#pragma comment(lib,"ws2_32.lib")  //winsock 2.2 library

    SOCKET    msock, ssock;            /* master & slave sockets           */
    SOCKET    sockets[100] = {NULL};
     
     int cc;
     char    *pts;                    /* pointer to time string           */
     time_t    now;                    /* current time                       */
     char buf[2000];                      /* buffer                          */
     char *input;
     HANDLE hThread1,hThread[100] = {NULL};
    unsigned int threadID,ThreadID[100],number;

    struct    sockaddr_in fsin;
    struct    sockaddr_in Sin;

unsigned int __stdcall Chat(PVOID PM) 
{    
        char buf1[2000];
        char buf2[2000];
        char buf3[2000];
        char buf4[2000];
        (void) time(&now);
        pts = ctime(&now);
        sockets[number] = ssock;
        SOCKET    sock = ssock;
        ThreadID[number] = threadID;
        unsigned int threadid = threadID;
        sprintf(buf1," 时间： %s  \t【我的线程号： %d 】\n",pts,threadid);
        (void) send(sock,buf1, sizeof(buf1), 0); 
        sprintf(buf2," 线程号 <%d> 客户  enter  \n",threadid,inet_ntoa(fsin.sin_addr),fsin.sin_port);
        printf("%s ",buf2);        
        printf("\t将自动把此数据发送给所有客户！ \n");
        for(int i=0;i<=number;i++)
        {            
            if(sockets[i] != NULL && sockets[i] != sock)
            {
            (void) send(sockets[i],buf2, sizeof(buf2), 0); 
            printf(" 发送至线程号<%d>成功！\n",ThreadID[i]);
            }
        }
        printf(" \n");


flag1:cc = recv(sock, buf3, BUFLEN, 0);   //cc为接收的字符数
    if(cc == SOCKET_ERROR|| cc == 0)
    {
        (void) time(&now);
        pts = ctime(&now);
        sprintf( buf3," 线程号 <%d> 客户  leave !  \n \t\t时间： %s",threadid,inet_ntoa(fsin.sin_addr),fsin.sin_port,pts);
        sock = NULL;    
        sockets[number] = NULL;
        CloseHandle(hThread[number]);
        printf("%s ", buf3);        
        printf("\t将自动把此数据发送给所有客户！ \n");
        for(int i=0;i<=number;i++)
        {            
            if(sockets[i] != NULL && sockets[i] != sock)
            {
            (void) send(sockets[i], buf3, sizeof(buf3), 0);     
            printf(" 发送至线程号<%d>成功！\n",ThreadID[i]);
            }            
        }
    printf(" \n");
    }

    else if(cc > 0) 
    {
        (void) time(&now);
        pts = ctime(&now);
    sprintf(buf4," 线程号 <%d> 客户说 ：%s  \n \t\t时间 ： %s",threadid,inet_ntoa(fsin.sin_addr),fsin.sin_port,buf3,pts);
    
        printf("%s ",buf4);
        printf("\t将自动把此数据发送给所有客户！ \n");
        for(int i=0;i<=number;i++)
        {            
            if(sockets[i] != NULL && sockets[i] != sock)
            {
            (void) send(sockets[i],buf4, sizeof(buf4), 0);         
            printf(" 发送至线程号<%d>成功！\n",ThreadID[i]);
            }            
        }
        printf(" \n");

        goto flag1;
    }
        (void) closesocket(sock);
    
        return 0;
        }


/*------------------------------------------------------------------------
 * main - Iterative TCP server for DAYTIME service
 *------------------------------------------------------------------------
 */
void main(int argc, char *argv[]) 
/* argc: 命令行参数个数， 例如：C:\> TCPdaytimed 8080 
                     argc=2 argv[0]="TCPdaytimed",argv[1]="8080" */
{
    int     alen;                    /* from-address length               */    
    WSADATA wsadata; 
    char    *service = "5050";    
    WSAStartup(WSVERS, &wsadata);                         //加载 winsock 2.2 library
    msock = socket(PF_INET, SOCK_STREAM, 0);              //生成套接字。TCP协议号=6， UDP协议号=17
    memset(&Sin, 0, sizeof(Sin));
    Sin.sin_family = AF_INET;
    Sin.sin_addr.s_addr = INADDR_ANY;                    //指定绑定接口的IP地址。INADDR_ANY表示绑定(监听)所有的接口。
    Sin.sin_port = htons((u_short)atoi(service));        //atoi--把ascii转化为int，htons - 主机序(host)转化为网络序(network), s(short) 
    bind(msock, (struct sockaddr *)&Sin, sizeof(Sin));   // 绑定端口号（和IP地址)
    listen(msock, 5);                                    //队列长度为5

    printf("\t\t\t\t Chat 多人聊天程序 \n");
    printf("\t\t\t\t       (Server) \n");
     (void) time(&now);
      pts = ctime(&now);
    printf("\t\t\t  时间 ：%s",pts);
        number = -1;
    while(1)                                    //检测是否有按键
    {                
        alen = sizeof(struct sockaddr);
        ssock = accept(msock, (struct sockaddr *)&fsin, &alen);
        number ++;
        hThread[number] = (HANDLE)_beginthreadex(NULL, 0,Chat,NULL, 0, &threadID);        
    }
    (void) closesocket(msock);
    WSACleanup();                         //卸载载 winsock 2.2 library
}

Client 部分：

/* TCPClient.cpp  -- 用于传递struct */
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define    BUFLEN        2000                  // 缓冲区大小
#define WSVERS        MAKEWORD(2, 0)        // 指明版本2.0 
#pragma comment(lib,"ws2_32.lib")         // 指明winsock 2.0 Llibrary

/*------------------------------------------------------------------------
 * main - TCP client for DAYTIME service
 *------------------------------------------------------------------------
 */
    
    SOCKET    sock,sockets[100] = {NULL};                          /* socket descriptor            */
//    int    cc;                                /* recv character count            */
    char    *packet = NULL;               /* buffer for one line of text    */
    char *pts,*input;
    HANDLE hThread;
    unsigned threadID;

unsigned int __stdcall Chat(PVOID PM ) 
{
       time_t    now;
      (void) time(&now);
       pts = ctime(&now);
       char buf[2000];

    while(1)
    {
        int cc = recv(sock, buf, BUFLEN, 0);   //cc为接收的字符数
        if(cc == SOCKET_ERROR|| cc == 0)
        {
            printf("Error: %d.----",GetLastError());
            printf("与服务器断开连接！\n");
            CloseHandle(hThread);
            (void)closesocket(sock);
            break;
        }
        else if(cc > 0) 
        {
        //    buf[cc] = '\0';
            printf("%s\n",buf);
        //    printf("输入数据（exit退出):  \n");
        }     
    }
    return 0;
}

int main(int argc, char *argv[])
{
    time_t    now;
     (void) time(&now);
       pts = ctime(&now);
    char    *host = "127.0.0.1";        /* server IP to connect         */
//    char    *host = "172.18.33.155";
//    char    *host = "172.18.33.93";
//    char    *host = "172.18.187.1";
    char *service = "5050";          /* server port to connect       */
//    char *service = "50000";
    struct  sockaddr_in sin;            /* an Internet endpoint address    */
    WSADATA wsadata;
    WSAStartup(WSVERS, &wsadata);       /* 启动某版本Socket的DLL        */        

    memset(&sin, 0, sizeof(sin));
    sin.sin_family = AF_INET;
    sin.sin_port = htons((u_short)atoi(service));    //atoi：把ascii转化为int. htons：主机序(host)转化为网络序(network), s--short
    sin.sin_addr.s_addr = inet_addr(host);           //如果host为域名，需要先用函数gethostbyname把域名转化为IP地址

    sock = socket(PF_INET, SOCK_STREAM,0);

    connect(sock, (struct sockaddr *)&sin, sizeof(sin));

    printf("\t\t\t\tChat 多人聊天程序 \n");
    printf("\t\t\t\t       (Client) \n");
    hThread = (HANDLE)_beginthreadex(NULL, 0,Chat, NULL, 0, &threadID);    
    printf(" \t\t\t\t 【您可以自由发言】\n\n");
    while(1)
    {
        char buf1[2000];
        
        //     scanf("%s",&buf1);
        
             gets_s(buf1);
             if(!strcmp(buf1 ,"exit"))
                 goto end;

            (void) send(sock,buf1, sizeof(buf1), 0);
            (void) time(&now);
            pts = ctime(&now);
           printf(" 发送成功！ ------时间： %s\n",pts);
    }
    
    end:    CloseHandle(hThread);
            closesocket(sock);
            WSACleanup();                     /* 卸载某版本的DLL */  
    
        printf("按回车键继续...");
        getchar();
        return 0;                           /* exit */
}