【网络编程实例】C++11实现基于TCP的回射服务器和客户端通信

参考《TCP/IP网络编程第四章》

服务器端代码：

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

#include 
#include 

using std::cout;
using std::cin;
using std::string;
using std::endl;

#define BUF_SIZE 1024
#define SERVER_IP "127.0.0.1"    // 指定服务端的IP
#define SERVER_PORT 9190            // 指定服务端的port


int main() {
    int serv_sock, clnt_sock;
    char message[BUF_SIZE];
    int str_len, i;
    struct sockaddr_in serv_adr, clnt_adr;
    socklen_t clnt_adt_sz;

    serv_sock = socket(PF_INET, SOCK_STREAM, 0);
    if(serv_sock == -1) cout <<"Create socket error" << errno << ": " << strerror(errno) << endl;

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

    if(bind(serv_sock, (struct sockaddr *)&serv_adr, sizeof(serv_adr)) == -1) 
        cout << "Bind error" << errno << ": " << strerror(errno) << endl;

    if(listen(serv_sock, 5) == -1) 
         cout << "Listen error" <<  errno << ": " << strerror(errno) << endl;

    clnt_adt_sz = sizeof(clnt_adr);

    //调用 5 次 accept 函数，共为 5 个客户端提供服务
    for(int i = 0; i != 5; ++i) {
        clnt_sock = accept(serv_sock, (struct sockaddr*) &clnt_adr, &clnt_adt_sz);
        if(clnt_sock == -1) 
            cout << "Accept error" << errno << ": " << strerror(errno) << endl;
        else  
            cout << "Connect client" << i + 1 << endl;

        while((str_len = read(clnt_sock, message, BUF_SIZE) != 0))
            write(clnt_sock, message, str_len);
        
        close(clnt_sock);
    }
    close(serv_sock);
    return 0;
}
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客户端代码：

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

#include 
#include 

using std::cout;
using std::cin;
using std::string;
using std::endl;

#define BUFFSIZE 1024
#define SERVER_IP "127.0.0.1"    // 指定服务端的IP
#define SERVER_PORT 9190            // 指定服务端的port


int main()
{
    int sock;
    char message[BUFFSIZE];
    int str_len;
    struct sockaddr_in serv_adr;

    sock = socket(PF_INET, SOCK_STREAM, 0);
    if(sock == -1) cout << "socket() error" << endl;

    bzero(&serv_adr, sizeof(serv_adr));

    serv_adr.sin_family = AF_INET;
    serv_adr.sin_addr.s_addr = inet_addr(SERVER_IP);
    serv_adr.sin_port = htons(SERVER_PORT);

    if(connect(sock, (struct sockaddr *)&serv_adr, sizeof(serv_adr)) == -1)
        cout << "connect() error: " << errno << " " << strerror(errno) << endl;
    else
        cout << "connected............" << endl;

    while(1)
    {
        cout << "Input message(Q to quit): " << endl;
        cin >> message;
        if(!strcmp(message, "q") || !strcmp(message, "Q"))
            break;

        write(sock, message, strlen(message));
        str_len = read(sock, message, BUFFSIZE - 1);
        message[str_len] = 0;
        cout << "Message from server:" << message << endl;
    }
    close(sock);
    return 0;
}
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