简易TCP通信案例-优快云博客

本文介绍了一个简单的TCP通信案例，包括服务器端和客户端的实现过程。服务器端负责接收客户端发来的商品信息并计算含税价格，然后将处理后的信息返回给客户端；客户端则发送商品信息并显示服务器端返回的数据。

Server端：

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



int serverPort = 8000;

int main()
{
	struct sockaddr_in listeningSockAddr;
	struct sockaddr_in clientSockAddr;
	int clientAddrSize;

	int listeningSock;
	int comunicateSock;


	char clientStr[100],str1[20],str2[20],str3[20];
	char toClientBuf[100];
	int clientStrLen,toClientBufLen;
	float c;
	//建立socket
	listeningSock =socket(AF_INET,SOCK_STREAM,0);
	if(listeningSock == -1){
		perror("socket failed");
		exit(1);
	}

	//建立IPv4地址
	bzero(&listeningSockAddr,sizeof(listeningSockAddr));
	listeningSockAddr.sin_family = AF_INET;
	listeningSockAddr.sin_addr.s_addr = htonl(INADDR_ANY);//监听所有ip地址
	listeningSockAddr.sin_port = htons(serverPort);

	//绑定socket
	if(bind(listeningSock,(struct sockaddr *)&listeningSockAddr,sizeof(listeningSockAddr)) == -1){
		perror("bind failed");
		exit(1);
	}

	//监听client端
	if(listen(listeningSock,20) == -1){
		perror("call to listen");
		exit(1);
	}
	
	
	while(1){
		printf("Accepting connections ... \n");
		//接受Client端连接
		comunicateSock = accept(listeningSock,(struct sockaddr*)&clientSockAddr,&clientAddrSize);//如果不再乎客户端的ip，那第二，三个参数可设为NULL

		if(comunicateSock == -1){
			perror("accept failed");
			exit(1);
		}

		printf("客户端的ip：%s,端口号：%d\n",inet_ntoa(clientSockAddr.sin_addr),clientSockAddr.sin_port);


		//接收client端传来的信息
		clientStrLen = recv(comunicateSock,clientStr,100,0);
		clientStr[clientStrLen] = '\0';

		printf("Received %d characters from client,the string is:%s\n",clientStrLen,clientStr);

		//分析处理Client端传来的信息
		if(clientStrLen > 0){
			strcpy(str1,strtok(clientStr," "));
			printf("第1个字符串为：%s\n",str1);
			strcpy(str2,strtok(NULL," "));
			printf("第2个字符串为：%s\n",str2);
			strcpy(str3,strtok(NULL," "));
			printf("第3个字符串为：%s\n",str3);
			c = atof(str3)*1.05;
			sprintf(toClientBuf,"商 品 号 为  %s \n商 品 名 为  %s\n含 税 价 为  %.2f\n",str1,str2,c);
		}
		//将处理过的信息返回给Client端
		toClientBufLen = strlen(toClientBuf);
		if(send(comunicateSock,toClientBuf,toClientBufLen,0) == -1){
			perror("call to send");
			exit(1);
		}
		//关闭与Client端的连接
		close(comunicateSock);
	}
	return 0;
}

client端：

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

int serverPort = 8000;

int main(int argc,char *argv[])
{
	struct sockaddr_in serverSock;
	int bindingServerAddrSock;
	char buf[8192];
	char *str = "A001 电视机 20000.00";

	printf("使用方法:client 字符串\n");

	if(argc < 2){
		printf("argc < 2,使用默认字符串\n");
	}
	else{
		str = argv[1];
	}

	/*建立Server IPv4地址 */
	bzero(&serverSock,sizeof(serverSock));
	serverSock.sin_family = AF_INET;
	serverSock.sin_addr.s_addr = inet_addr("127.0.0.1");
	serverSock.sin_port = htons(serverPort);

	/* 建立Socket */
	bindingServerAddrSock = socket(AF_INET,SOCK_STREAM,0);
	if(bindingServerAddrSock == -1){
		perror("socket failed");
		exit(1);
	}

	/*连接Server */
	if(connect(bindingServerAddrSock,(void *)&serverSock,sizeof(serverSock)) == -1){
		perror("connect failed");
		exit(1);
	}
	/*将str字符串传给 Server */
	printf("Sending message %s to server ...\n",str);

	if(send(bindingServerAddrSock,str,strlen(str),0) == -1){
	perror("error in sending\n");
	exit(1);
	}
	
	/*接收Server回传的信息 */
	if(recv(bindingServerAddrSock,buf,8192,0) == -1){
	perror("Error in receiving");
	exit(1);
	}

	printf("\nResponse these from server :%s\n",buf);
	close(bindingServerAddrSock);
 	return 0;
}