请问谁知道用C怎么编一个udp通信程序

[fatglasses]

大家知道源码吗？？或者介绍一个网站也行哦！！！！急用！！！

[zichuanxiu]

建议买本socket编程的书看看，

[fatglasses]

哦！！网上有吗？？？我不想买书！！！

[Mypiger]

http://msdn.microsoft.com/library/
搜索socket，sendto,recvfrom,bind 就有原代码的了

[zhousqy]

电子书网上多的是

[jiongdy]

#include<Winsock2.h>
#include<stdio.h>
#define SERVPORT 3333
#define BACKLOG 10
void main()
{int sockfd;
struct sockaddr_in serv_addr;
struct sockaddr_in remote_addr;
//initial
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2,0),&wsaData)!=0)
printf("initial error\n");
else
printf("initial ok\n");

serv_addr.sin_family=AF_INET;
serv_addr.sin_port=htons(SERVPORT);
serv_addr.sin_addr.s_addr=INADDR_ANY;
//serv_addr.sin_addr.s_addr=inet_addr("192.168.1.22");

remote_addr.sin_family=AF_INET;
remote_addr.sin_port=htons(SERVPORT);
//serv_addr.sin_addr.s_addr=INADDR_ANY;
remote_addr.sin_addr.s_addr=inet_addr("192.168.1.150");

//socket
if((sockfd=socket(AF_INET,SOCK_DGRAM,0))==-1)
printf("socket error\n");
else
printf("socket ok\n");

//bind
if(bind(sockfd,(struct sockaddr * )&serv_addr,sizeof(struct sockaddr))<0)
{
printf("bind error\n");
int i;
i=WSAGetLastError ();
printf("i=%d\n",i);
}
else
printf("bind ok\n");



//sendto and recv/测试用


while(1)
{ /*先发送数据*/
if (sendto(sockfd, "Hello, you are connected!\n",
25, 0,(struct sockaddr *)&remote_addr,sizeof(struct sockaddr)) == -1)
printf("sendto error\n");
else
printf("sendto ok\n");
/*再接收数据，若没有数据则阻塞*/

int fromlen=sizeof(struct sockaddr);
char PkMsg[26];
if (recvfrom(sockfd,(char *)&PkMsg,25,0,(struct sockaddr *)&remote_addr,(int *)&fromlen) == -1)
printf("recvfrom error\n");
else
printf("recvfrom ok\n");
printf("%s\n",PkMsg);

}
closesocket(sockfd);
//}


}

[fatglasses]

谢谢楼上的兄弟！还差一个客户端的程序哦！！！能一起发出来吗？？

[jixingzhong]

论坛中的：

服务器:

#include "stdafx.h"
#include<stdio.h>
#include<Winsock2.h>
#include<string.h>
#pragma comment(lib, "WS2_32.LIB")
void main()
{
char buffrecv[100];
memset(buffrecv,0,100);
SOCKET serversocket;
SOCKET newsocket;
struct sockaddr_in serveraddr;
struct sockaddr_in clientaddr;
WSADATA wsaData;

WSAStartup(MAKEWORD(2,2),&wsaData);
serversocket=socket(AF_INET,SOCK_STREAM,0);

serveraddr.sin_family=AF_INET;
serveraddr.sin_port=htons(5555);
serveraddr.sin_addr.s_addr=htonl(INADDR_ANY);

bind(serversocket,(sockaddr *)&serveraddr,sizeof(struct sockaddr_in));
listen(serversocket,5);

int size=sizeof(struct sockaddr_in);
newsocket=accept(serversocket,(sockaddr *) &clientaddr,&size);
recv(newsocket,buffrecv,100,0);

printf("receive:\n");
printf("%s",buffrecv);
}

客户端:

#include "stdafx.h"
#include<stdio.h>
#include<Winsock2.h>
#include<string.h>
#pragma comment(lib, "WS2_32.LIB")
void main()
{
/*
char buffsend[100];
char *p=buffsend;
for(;((*p)=getchar())!='\n';)
{
p++;
}
p=buffsend;
*/
char buffsend[100]="有只小鸟掉下水";
SOCKET clientsocket;
SOCKADDR_IN serveraddr;
WSADATA wsaData;
WSAStartup(MAKEWORD(2,2),&wsaData);
clientsocket=socket(AF_INET,SOCK_STREAM,0);
Sleep(2000);
if(clientsocket==INVALID_SOCKET)
{
printf("create clientsocket failed\n");
exit(0);
}
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(5555);
serveraddr.sin_addr.s_addr = inet_addr("127.0.0.1");
int result=connect(clientsocket,(SOCKADDR *)&serveraddr,sizeof(serveraddr));
Sleep(2000);
if(result==-1)
{
printf("connect server failed\n");
exit(0);
}
result=send(clientsocket,buffsend,100,0);
if(result==-1)
{
printf("send message failed\n");
}
Sleep(2000);
}

[fatglasses]

谢谢哦！！！

[caiyujie87]

up

[yiliao]

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