UDP HelloWord

Client.cpp

#include <stdio.h>

#include <winsock2.h>

#pragma comment (lib,"ws2_32")



//注释的为UDP的代码，方便对比

//流程

//TCP：WSAStarup socket connect recv/send closesocket WSACleanup

int main(int argc,char* argv[])

{

     WSADATA wsaData;

     WSAStartup(MAKEWORD(2,2),&wsaData);



     //SOCKET s = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);

     SOCKET s = socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP);

    

     sockaddr_in addr;

     addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

     addr.sin_family = PF_INET;

     addr.sin_port = htons(827);



     //connect(s,(SOCKADDR*)&addr,sizeof(SOCKADDR));

     sendto(s,"hello world server UDP",strlen("hello world server UDP") + sizeof(char),

                    0,(SOCKADDR*)&addr,sizeof(SOCKADDR));



     sockaddr_in clientAddrUDP;

    char szBuffer[MAXBYTE] = {0};

     int len = sizeof(SOCKADDR);



     //recv(s,szBuffer,MAXBYTE,NULL);

     recvfrom(s,szBuffer,MAXBYTE,0,(SOCKADDR*)&clientAddrUDP,&len);



     printf("szBuffer = %s \r\n",szBuffer);



     closesocket(s);



     WSACleanup();



     return 0;

}

Server.cpp

//注释的为UDP的代码，方便对比

//TCP::WSAStartup socket bind listen accept send/recv closesocket WSACleanup

#include <winsock2.h>

#include <stdio.h>

#pragma comment (lib,"ws2_32")



int main(int argc , char* grgv[])

{

     WSADATA wsaData;

     WSAStartup(MAKEWORD(2,2),&wsaData);



     //SOCKET s = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);

     SOCKET s = socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP);



     sockaddr_in addr;

     addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

     addr.sin_port = htons(827);

     addr.sin_family = PF_INET;



     bind(s,(SOCKADDR*)&addr,sizeof(SOCKADDR));



     //listen(s,1);



     SOCKADDR clientAddr;

     int nSize = sizeof(SOCKADDR);

     //SOCKET clientSock;

     char buf[MAXBYTE] = {0};

     int len = sizeof(SOCKADDR);

     recvfrom(s,buf,MAXBYTE,0,(SOCKADDR*)&clientAddr,&len);

     printf("%s \r\n",buf);



     //clientSock = accept(s,(SOCKADDR*)&clientAddr,&nSize);

     //send(clientSock,"hello client \r\n",strlen("hello client \r\n" + sizeof(char)),NULL);



     sendto(s,"hello world client UDP",strlen("hello world client UDP") + sizeof(char),

          0,(SOCKADDR*)&clientAddr,sizeof(SOCKADDR));

    

     //closesocket(clientSock);

     closesocket(s);



     WSACleanup();

     return 0;

}