C/C++下利用UDP实现通信（windows10,vs2010）

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udp客户端代码

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <string.h>

#include<WS2tcpip.h>

#include <windows.h>

#pragma comment(lib,'ws2_32.lib')

int main(){

WSADATA data;

WORD version = MAKEWORD(2, 2);

WSAStartup(version, &data);

int sockets=0;

sockets=socket(AF_INET,SOCK_DGRAM,0);

if(sockets<0){

printf('socket connect failed');

return -1;

}

printf('socket initialize success ');

while(1){

int tolen=0;

int ret=0;

char buf[1024]={0};

gets(buf);

struct sockaddr_in client;

memset(&client, 0, sizeof(client));

client.sin_family = AF_INET;

client.sin_port = htons(8888);

client.sin_addr.s_addr = inet_addr('192.168.132.1');

ret=sendto(sockets,(char *)&buf, sizeof(buf),0,(struct sockaddr *) &client, sizeof(client));

if(ret<0){

printf('sendto failed');

return -1;

}

printf('sendto success ');

ret=recvfrom(sockets,(char *)&buf, sizeof(buf),0,(struct sockaddr *) &client,(socklen_t *)&client);

if(ret<0){

printf('recvfrom failed');

return -1;

}

printf('IP=%s,port=%d ',inet_ntoa(client.sin_addr),ntohs(client.sin_port));

printf('recvfrom success ');

printf('receive: %s ',buf);

closesocket(sockets);

WSACleanup();

}

}

服务器端代码

#include <stdio.h>

#include <stdlib.h>#include <time.h>

#include <string.h>

#include<WS2tcpip.h>

#include <windows.h>

#pragma comment(lib,'ws2_32.lib')

int main(){

WSADATA data;

WORD version = MAKEWORD(2, 2);

WSAStartup(version, &data);

int sockets=0;

sockets=socket(AF_INET,SOCK_DGRAM,0);

if(sockets<0){

printf('socket connect failed');

return -1;

}

printf('socket initialize success ');

int ret=0;

struct sockaddr_in server;

memset(&server, 0, sizeof(server));

server.sin_family = AF_INET;

server.sin_port = htons(8888);

server.sin_addr.s_addr = inet_addr('192.168.132.1');

ret=bind(sockets,(struct sockaddr *)&server,sizeof(server));

if(ret<0){

printf('bind failed');

return -1;

}

printf('bind success ');

while(1){

int addrlen=0;

char buf[1024]={0};

struct sockaddr_in clientaddr={0};

addrlen=sizeof(clientaddr);

ret=recvfrom(sockets,(char *)&buf, sizeof(buf),0,(struct sockaddr *) &clientaddr,(socklen_t *)&addrlen);

if(ret<0){

printf('recvfrom failed');

return -1;

}

printf('IP=%s,port=%d ',inet_ntoa(clientaddr.sin_addr),ntohs(clientaddr.sin_port));

printf('recvfrom success ');

printf('receive: %s ',buf);

memset(buf,0,sizeof(buf));

gets(buf);

ret=sendto(sockets,(char *)&buf, sizeof(buf),0,(struct sockaddr *) &server, sizeof(server));

if(ret<0){

printf('sendto failed');

return -1;

}

printf('sendto success ');

closesocket(sockets);

WSACleanup();

}

}

运行效果: