linux c UDP编程实现双向通信（学习记录）

linux c 编程学习记录

程序说明:用linuxc网络编程的UDP套接字编程,实现内网中不同ip之间服务端和客户端的双向通信

Service端：

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define PORTNO 60000
#define PORTS  56666
#define MSGSIZE 128
int main( void )
{ 
        int sfd,ret,len,sfd1;
        struct sockaddr_in st, cst;
        char msg[MSGSIZE];
        len = sizeof(struct sockaddr);
        sfd = socket( AF_INET, SOCK_DGRAM, 0);
        memset( &st, 0x0, len );
        st.sin_family = AF_INET;    //IPV4协议族
        st.sin_addr.s_addr = inet_addr("192.168.36.129");
        st.sin_port = htons(PORTNO);
        ret = bind( sfd, (struct sockaddr *)&st, len );
        len = sizeof(struct sockaddr);
        sfd1 = socket( AF_INET, SOCK_DGRAM, 0);
        memset( &cst, 0x0, len );
        cst.sin_family = AF_INET;    //IPV4协议族
        cst.sin_addr.s_addr = inet_addr("192.168.36.129");//ip地址
        cst.sin_port = htons(PORTS);   //设定端口号
        //接受客户端的数据
        while(1){
        ret = recvfrom( sfd, msg, MSGSIZE, 0, (struct sockaddr *)&st, (socklen_t *)&len );
        msg[ret]=0x0;
        printf("服务器从客户端接收的数据为:[%s]\n", msg);
        //发送服务端的数据
        char BUFF;
        scanf("%s",&BUFF);
        strcpy(msg,&BUFF);
        sendto( sfd1, msg, strlen(msg),0, (struct sockaddr *)&cst, (socklen_t)len );
        }
        return 0;
}

client端：

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define PORTNO 60000
#define PORTS  56666
#define MSGSIZE 128
int main( void )
{
        int sfd,sfd1,ret,ret1;
        struct sockaddr_in st,cst;
        size_t len;
        char msg[MSGSIZE];
        len = sizeof(struct sockaddr);
        sfd = socket( AF_INET, SOCK_DGRAM, 0);
        memset( &st, 0x0, len );
        st.sin_family = AF_INET;    //IPV4协议族
        st.sin_addr.s_addr = inet_addr("192.168.36.129");
        st.sin_port = htons(PORTNO);   //设定端口号
        len = sizeof(struct sockaddr);
        sfd1 = socket( AF_INET, SOCK_DGRAM, 0);
        memset( &cst, 0x0, len );
        cst.sin_family = AF_INET;    //IPV4协议族
        cst.sin_addr.s_addr = inet_addr("192.168.36.129");
        cst.sin_port = htons(PORTS);
        ret = bind( sfd1, (struct sockaddr *)&cst, len );
        char BUFF;
		while(1){
        scanf("%s",&BUFF);
        strcpy(msg,&BUFF);
        sendto( sfd, msg, strlen(msg),0, (struct sockaddr *)&st, (socklen_t)len );
        ret = recvfrom( sfd1, msg, MSGSIZE, 0, (struct sockaddr *)&cst, (socklen_t *)&len );
        msg[ret]=0x0;
        printf("服务器从客户端接收的数据为:[%s]\n", msg);
        }
        return 0;
}

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