Linux下socket編程（可簡單實現聊天的服務端與客戶端）

server.cpp

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define  BUF_SIZE 100

int main()
{
	//創建套接字
	int serv_sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	//將套接字和ip、端口綁定
	struct sockaddr_in serv_addr;
	memset(&serv_addr,0,sizeof(serv_addr));//每個字節都用0填充
	serv_addr.sin_family=AF_INET;//使用ipv4地址
	serv_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
	serv_addr.sin_port=htons(9000);
	bind(serv_sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr));

	//進入監聽狀態，等待用戶發起請求
	listen(serv_sock,20);

	//接收客戶端請求
	struct sockaddr_in clnt_addr;
	socklen_t clnt_addr_size=sizeof(clnt_addr);
	char bufferrecv[BUF_SIZE]={0};
	char buffersend[BUF_SIZE]={0};
	while(1)
	{
		int clnt_sock=accept(serv_sock,(struct sockaddr*)
					&clnt_addr,&clnt_addr_size);
	
		read(clnt_sock,bufferrecv,sizeof(bufferrecv));
		printf("服務器端接收到的消息：%s\n",bufferrecv);

		//向客戶端發送消息
		printf("輸入發送信息：\n");
		fgets(buffersend,100,stdin);
		write(clnt_sock,buffersend,sizeof(buffersend));
	
		close(clnt_sock); //關閉套接字
		memset(bufferrecv,0,BUF_SIZE);//重置緩衝區
	}
	close(serv_sock);
	
	return 0;
}

client.cpp

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define  BUF_SIZE 100

int main()
{

	//向服務器發起請求
	struct sockaddr_in serv_addr;
	memset(&serv_addr,0,sizeof(serv_addr));
	serv_addr.sin_family=AF_INET;
	serv_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
	serv_addr.sin_port=htons(9000);

	char buffersend[BUF_SIZE]={0};
	char bufferrecv[BUF_SIZE]={0};
	while(1)
	{
		//創建套接字
		int sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
		connect(sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr));

		//向服務器發送數據
		printf("輸入發送信息：\n");
		fgets(buffersend,100,stdin);
		write(sock,buffersend,sizeof(buffersend));
		//讀取服務器返回的數據
		read(sock,bufferrecv,sizeof(bufferrecv)-1);
		//輸出接收到的消息
		printf("接收到的消息：%s\n",bufferrecv);

		memset(buffersend,0,BUF_SIZE);
		memset(bufferrecv,0,BUF_SIZE);
		//關閉套接字
		close(sock);
	}
	return 0;
}