Linux Socket 入門
在兩臺LINUX系統下使用socket進行傳輸。
首先介紹client端:
既然要使用socket那麼當然要先include它的函式庫
#include <sys/socket.h>
#include <netinet/in.h>
client的程式碼
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <strings.h>
#include <string.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <iostream>
#include <unistd.h>
using namespace std;
int main()
{
char ip[32] = "127.0.0.1";
struct sockaddr_in dest;
char buffer[256];
char res[256] = "client-res";
//初始
bzero(&dest, sizeof(dest));
dest.sin_family = PF_INET;
dest.sin_port = htons(8889);//port
dest.sin_addr.s_addr = inet_addr(ip);//ip
printf("--------initial!--------\n");
int sockfd;
//建立
sockfd = socket(PF_INET, SOCK_STREAM, 0);
//連線
connect(sockfd, (struct sockaddr*)&dest, sizeof(dest));
printf("---connection success---\n");
//發送訊息
send(sockfd, res, sizeof(res), 0);
//接收回傳訊息
bzero(buffer, 256);//清除
recv(sockfd, buffer, sizeof(buffer), 0);//接收
printf("server: %s\n", buffer);
close(sockfd);
return 0;
}
server的程式碼
#include <iostream>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdlib.h>
#include <netdb.h>
#include <strings.h>
#include <unistd.h>
using namespace std;
int main()
{
int sockfd, res;
struct sockaddr_in dest;
char Hello[256] = "Hello client!";
char buffer[256];
//建立
sockfd = socket(PF_INET, SOCK_STREAM, 0);
//初始化
bzero(&dest, sizeof(dest));
dest.sin_family = AF_INET;
dest.sin_port = htons(8889);//port
dest.sin_addr.s_addr = INADDR_ANY;
bind(sockfd, (struct sockaddr*)&dest, sizeof(struct sockaddr));
listen(sockfd, 20);
printf("--------initial!--------\n");
int clientfd;
struct sockaddr_in client_addr;
socklen_t addrlen = sizeof(client_addr);
//等待連線
printf("wait..\n");
clientfd = accept(sockfd, (struct sockaddr*)&client_addr, &addrlen);
printf("---connection success---\n");
//接收
res = recv(clientfd, buffer, sizeof(buffer), 0);
printf("client: %s, %d bytes\n", buffer, res);
//回傳
send(clientfd, Hello, sizeof(Hello), 0);
//close(clientfd);
close(sockfd);
return 0;
}
執行結果
client端:
--------initial!--------
---connection success---
server: Hello client!
Server端:
--------initial!--------
wait..
---connection success---
client: client-res, 256 bytes