Linux平臺下基於TCP/IP協議的C++網絡編程初步

原博文地址：http://blog.csdn.net/nuptboyzhb/article/details/7998066

Linux平臺下基於TCP/IP協議的C++網絡編程初步
實驗平臺：Ubuntu(Linux)
開發工具：Eclipse+CDT

作者：@鄭海波  http://blog.csdn.net/nuptboyzhb/
特點：
1.基於Linux平臺的網絡編程，最重要的特點是要調用Linux的API函數。這是與windows平臺最大的不同。
2.我們將發送的消息封裝成結構體，增添了其傳遞消息的複雜性。

3.我們用的是socket編程，沒有用ACE網絡編程。
服務器：
[c++ code]

 

/*
 * MyMain.cpp
 *
 *  Created on: 2012-9-19
 *      Author: zhb
 */
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <unistd.h>
#define SERVPORT 3333
#define BACKLOG 10
#define MAXSIZE 1024
/*
 *自定義信息
 */
typedef struct MyMessage{
    int ID;
    char info[256];
}MyMessage,*pMyMessage;
int main() {
    int sockfd, client_fd;
    struct sockaddr_in my_addr;
    struct sockaddr_in remote_addr;
    //創建套接字
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket create failed!");
        exit(1);
    }
    //綁定端口地址
    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 error!");
        exit(1);
    }
    //監聽端口
    if (listen(sockfd, BACKLOG) == -1) {
        perror("listen error");
        exit(1);
    }

    while (1) {
        //int sin_size = sizeof(struct sockaddr_in);
        socklen_t sin_size = sizeof(struct sockaddr_in);
        if ((client_fd = accept(sockfd,(struct sockaddr*) &remote_addr,&sin_size)) == -1){
            perror("accept error!");
            continue;
        }
        printf("Received a connection from %s\n", (char*)inet_ntoa(remote_addr.sin_addr));

        //子進程段
        if (!fork()){
            //接受client發送的請示信息
            int rval;
            char buf[MAXSIZE];
            if ((rval = read(client_fd, buf, MAXSIZE)) < 0) {
                perror("reading stream error!");
                continue;
            }
            printf("%s\n", buf);
            //向client發送信息
            //char* msg = "Hello,Mr hqlong, you are connected!\n";
            MyMessage data;
            memset((void *)&data,0,sizeof(MyMessage));
            data.ID=123;
            strcpy(data.info,"This message come from ServSocket!");
            if(send(client_fd,(void*)&data,sizeof(MyMessage),0) == -1){
                perror("send error!");
            }
            close(client_fd);
            exit(0);
        }
        close(client_fd);
    }
    return 0;
}

客戶端：
[c++ code]

/*
 * MyMainClient.cpp
 *
 *  Created on: 2012-9-19
 *      Author: zhb
 */
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <unistd.h>
#define SERVPORT 3333
#define MAXDATASIZE 100
#define SERVER_IP "127.0.0.1"
#define DATA  "this is a client message"
/*
 *自定義信息
 */
typedef struct MyMessage{
    int ID;
    char info[256];
}MyMessage,*pMyMessage;
int main(int argc, char* argv[]) {
    int sockfd, recvbytes;
    //char buf[MAXDATASIZE];
    MyMessage recvData;
    struct sockaddr_in serv_addr;

    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket error!");
        exit(1);
    }
    bzero(&serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(SERVPORT);
    serv_addr.sin_addr.s_addr = inet_addr(SERVER_IP);

    if (connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(struct sockaddr))== -1) {
        perror("connect error!");
        exit(1);
    }
    write(sockfd, DATA, sizeof(DATA));
    memset((void *)&recvData,0,sizeof(MyMessage));
    if ((recvbytes = recv(sockfd, (void *)&recvData,sizeof(MyMessage), 0)) == -1) {
        perror("recv error!");
        exit(1);
    }
    //buf[recvbytes] = '\0';
    printf("Received:ID=%d,Info= %s",recvData.ID,recvData.info);
    close(sockfd);
    return 0;
}

 

不足：服務器沒有進行多線程處理！當多個Client接入時，應考慮多線程編程。以後繼續深入...