#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
int main(int argc, char *argv[])
{
int sock;
//sendto中使用的对方地址
struct sockaddr_in toAddr;
//在recvfrom中使用的对方主机地址
struct sockaddr_in fromAddr;
int nRecvLen;
unsigned int addrLen;
char szRrecvBuffer[128];
char szSendBuffer[128];
sock = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
if(sock < 0)
{
printf("创建套接字失败了.\r\n");
exit(0);
}
memset(&fromAddr,0,sizeof(fromAddr));
fromAddr.sin_family=AF_INET;
fromAddr.sin_addr.s_addr=htonl(INADDR_ANY);
fromAddr.sin_port = htons(4000);
if(bind(sock,(struct sockaddr*)&fromAddr,sizeof(fromAddr))<0)
{
printf("bind() 函数使用失败了.\r\n");
close(sock);
exit(1);
}
while(1){
addrLen = sizeof(toAddr);
if((nRecvLen = recvfrom(sock,szRrecvBuffer,128,0,(struct sockaddr*)&toAddr,&addrLen))<0)
{
printf("()recvfrom()函数使用失败了.\r\n");
close(sock);
exit(1);
}
printf("对方说:%s\r\n",szRrecvBuffer);
printf("请输入需要发送的内容:");
scanf("%s",szSendBuffer);
if(sendto(sock,szSendBuffer,strlen(szSendBuffer),0,(struct sockaddr*)&toAddr,sizeof(toAddr))<0){
printf("sendto fail\r\n");
close(sock);
exit(0);
}
if (0==strcmp(szSendBuffer,"quit")||0==strcmp(szRrecvBuffer,"quit"))
{
break;
}
}
close(sock);
return 0;
}
//客户端
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
int main(int argc, char *argv[])
{
int sock;
//sendto中使用的对方地址
struct sockaddr_in toAddr;
//在recvfrom中使用的对方主机地址
struct sockaddr_in fromAddr;
unsigned int fromLen;
char szRecvBuffer[128];
char szRrecvBuffer[128];
sock = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
if(sock < 0)
{
printf("创建套接字失败了.\r\n");
exit(1);
}
memset(&toAddr,0,sizeof(toAddr));
toAddr.sin_family=AF_INET;
toAddr.sin_addr.s_addr=inet_addr("127.0.0.1");
toAddr.sin_port = htons(4000);
while (1)
{
printf("请输入需要发送的内容并以回车结束: ");
scanf("%s",szRrecvBuffer);
if(sendto(sock,szRrecvBuffer,strlen(szRrecvBuffer),0,(struct sockaddr*)&toAddr,sizeof(toAddr)) != strlen(szRrecvBuffer))
{
printf("sendto() 函数使用失败了.\r\n");
close(sock);
exit(1);
}
fromLen = sizeof(fromAddr);
if(recvfrom(sock,szRecvBuffer,128,0,(struct sockaddr*)&fromAddr,&fromLen)<0)
{
printf("()recvfrom()函数使用失败了.\r\n");
close(sock);
exit(1);
}
printf("对方说:%s\r\n",szRecvBuffer);
if (0==strcmp(szRrecvBuffer,"quit")||0==strcmp(szRecvBuffer,"quit"))
{
break;
}
}
close(sock);
}