udpclient.c

一个简单的udp通讯程序

// udp.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
//#include <windows.h>
#include <winsock2.h>
#include <stdio.h>
#pragma comment(lib,"WS2_32.lib")


int _tmain(int argc, _TCHAR* argv[])
{
	Sleep(3000);
	
	WSADATA wasdata;
	::WSAStartup (MAKEWORD(2,2),&wasdata);
	SOCKET sock;
	sock=socket(AF_INET,SOCK_DGRAM,0);
	//////////////////////////////////////////////////////////////
	struct sockaddr_in client;
	::ZeroMemory (&client,sizeof(client));
	client.sin_family =AF_INET;
	client.sin_port =htons(9990);
    client.sin_addr.S_un .S_addr =inet_addr("10.1.0.45");
	bind(sock,(struct sockaddr*)&client,sizeof(client));
	struct sockaddr_in server;
	::ZeroMemory (&server,sizeof(server));
	server.sin_family =AF_INET;
	server.sin_port =htons(atoi(argv[2]));
	server.sin_addr .S_un .S_addr =inet_addr(argv[1]);
	connect(sock,(struct sockaddr*)&server,sizeof(struct sockaddr));	
	while(1)
	{
		char sendbuf[100]="\0";
		if(fgets(sendbuf,sizeof(sendbuf),stdin))
		{
			if(strncmp(sendbuf,"exit",4)==0)
				break;
            send(sock,sendbuf,sizeof(sendbuf),0);
			char recvbuf[100]="\0";
		    recv(sock,recvbuf,sizeof(recvbuf),0);
			printf("recv is %s\n",recvbuf);
		}	  
	}	
	closesocket(sock);
	WSACleanup( );
	//////////////////////////////////////////////////////////////

	//char buf[100]="test";
	//struct sockaddr_in server;
	//::ZeroMemory (&server,sizeof(server));
	//server.sin_family =AF_INET;
	//server.sin_port =htons(atoi(argv[2]));
	//server.sin_addr .S_un .S_addr =inet_addr(argv[1]);
	//while(1)
	//{
	//	char sendbuf[100]="\0";
	//	if(fgets(sendbuf,sizeof(sendbuf),stdin))
	//	{ 
	//		printf("sendbuf is %s\n",sendbuf);
	//		if(strncmp(sendbuf,"exit",4)==0)
	//			break;
 //           sendto(sock,sendbuf,sizeof(sendbuf),0,(struct sockaddr*)&server,sizeof(struct sockaddr));
	//		char recvbuf[100]="\0";
	//	    struct sockaddr test;
	//	    struct sockaddr_in *test1;
	//        int addrlen=sizeof(struct sockaddr);
	//        recvfrom(sock,recvbuf,sizeof(buf),0,&test,&addrlen);
	//	    test1=(struct sockaddr_in*)&test;
	//	    printf("receive is %s,ip=%s\n",recvbuf,inet_ntoa(test1->sin_addr ));	
	//		printf("recv is %s\n",recvbuf);
	//	}	 		  	 	     
	//}
	//closesocket(sock);
	//WSACleanup( );
	////////////////////////////////////////////////////////////////////////
	return 0;
}