UDP通信程序（客戶端）

/*===========================================================================
 Name        : Client.c
 Author      : Haier
 Version     : 1.0
 Copyright   : Your copyright notice
 Description : Client in C, Ansi-style,Compile by Gcc
 ============================================================================*/

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

#define SERVERADDR ("127.0.0.1")
#define SERVERPORT (6000)
#define BUFSIZE    (1024)

int main(int argc,char *argv[])
{
	int ClientSocket;
	struct sockaddr_in ServerAddr;
	char Text[80],Buf[BUFSIZE];
	int TextLen;

	ClientSocket=socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP);
	if(ClientSocket<0)
	{
		printf("Socket Failed !\n");
		exit(0);
	}

	memset(&ServerAddr,0,sizeof(ServerAddr));
	ServerAddr.sin_family=AF_INET;
	ServerAddr.sin_addr.s_addr=inet_addr(SERVERADDR);
	ServerAddr.sin_port=htons((unsigned short)SERVERPORT);

	while(1)
	{
		printf("Please input some text: ");
		scanf("%s",&Text);

		if(strcmp(Text,"quit")==0)
		{
			break;
		}

		strcpy(Buf,Text);
		TextLen=strlen(Text);

		sendto(ClientSocket,Buf,TextLen,0,(struct sockaddr *)&ServerAddr,sizeof(ServerAddr));

	}

	close(ClientSocket);
	return 0;
}