socket udp

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "winsock2.h"




typedef struct tagSOCKET_SERVER_INFO_S
{
int port;
char ip[32];
}SOCKET_SERVER_INFO_S;


int clientSendThread(void* pv)
{
SOCKET sendSocket;
sockaddr_in serverAddr;
SOCKET_SERVER_INFO_S *serverInfo = (SOCKET_SERVER_INFO_S *)pv;
int ret = 0;


sendSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(serverInfo->port);
serverAddr.sin_addr.s_addr = inet_addr(serverInfo->ip);


while(TRUE)
{
char buf[64];


_snprintf(buf, sizeof(buf), "client(%d)'s message, last ret(%d)", GetCurrentThreadId(), ret);


 ret = sendto(sendSocket, buf, sizeof(buf), 0, (SOCKADDR *) &serverAddr, sizeof(serverAddr));
srand( (unsigned)GetTickCount());
Sleep((rand()%2 == 0)? 3000:1000);
}


closesocket(sendSocket);
return 0;
}


void runClient(SOCKET_SERVER_INFO_S *serverInfo)
{
HANDLE clientThreadHandle1 = NULL;
HANDLE clientThreadHandle2 = NULL;


clientThreadHandle1 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)clientSendThread, serverInfo, 0, NULL);
clientThreadHandle2 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)clientSendThread, serverInfo, CREATE_SUSPENDED, NULL);


Sleep(500);
ResumeThread (clientThreadHandle2);


CloseHandle(clientThreadHandle1);
CloseHandle(clientThreadHandle2);
}


int serverRecvThread(void* pv)
{
SOCKET recvSocket;
sockaddr_in serverAddr;
SOCKET_SERVER_INFO_S *serverInfo = (SOCKET_SERVER_INFO_S *)pv;
int serverAddrSize = sizeof(serverAddr);


recvSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(serverInfo->port);
serverAddr.sin_addr.s_addr  = htonl(INADDR_ANY);


  bind(recvSocket, (SOCKADDR *) &serverAddr, sizeof(serverAddr));


while(TRUE)
{
char buf[64] = {0};


int ret = 0;
 ret = recvfrom(recvSocket, buf, sizeof(buf), 0, (SOCKADDR *) &serverAddr, &serverAddrSize);


 printf("recv: [%s] ret(%d)\n", buf, ret);


}


closesocket(recvSocket);


return 0;
}


void runServer(SOCKET_SERVER_INFO_S *serverInfo)
{
HANDLE serverThreadHandle = NULL;


serverThreadHandle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)serverRecvThread, serverInfo, 0, NULL);


CloseHandle(serverThreadHandle);
}


void initApp(SOCKET_SERVER_INFO_S *serverInfo)
{
WSADATA wsaData;
WSAStartup(MAKEWORD(2,2), &wsaData);


memset(serverInfo, 0, sizeof(SOCKET_SERVER_INFO_S));


serverInfo->port = 9527;
strncpy(serverInfo->ip, "127.127.0.1", sizeof(serverInfo->ip));


printf("init app, ip(%s) port(%d)\n", serverInfo->ip, serverInfo->port);
}


void destroyApp()
{
printf("bye\n");
WSACleanup();
}


int main(int a, char** b)
{
static SOCKET_SERVER_INFO_S serverInfo;


initApp(&serverInfo);




runServer(&serverInfo);
runClient(&serverInfo);


getchar();


destroyApp();


return 0;
}