udp server.c

#pragma comment(lib, "ws2_32.lib")
#include<winsock2.h>
#include <WinBase.h>
#include<stdio.h>
#include<WS2tcpip.h>
BOOL InitWinsock();
void main()
{
SOCKET socket1;
InitWinsock();
struct sockaddr_in local;
struct sockaddr_in from;
int fromlen = sizeof(from);
local.sin_family = AF_INET;
local.sin_port = htons(1000);
local.sin_addr.s_addr = INADDR_ANY;
socket1 = socket(AF_INET, SOCK_DGRAM, 0);
bind(socket1, (struct sockaddr*)&local, sizeof(local));
while (1)
{
char buffer[1024] = "\0";
char IPdotdec[20];
inet_ntop(AF_INET, &from.sin_addr, IPdotdec, 16);
printf("waiting for message from others----------\n");
if (recvfrom(socket1, buffer, sizeof(buffer), 0, (struct sockaddr*) &from, &fromlen) != SOCKET_ERROR);
{
printf("Received datagram from %s--%s\n", IPdotdec, buffer);
sendto(socket1, buffer, sizeof(buffer ), 0,(struct sockaddr*)&from, fromlen);
}
Sleep(500);
}
closesocket(socket1);
}
BOOL InitWinsock()
{
int Error;
WORD VersionRequested;
WSADATA WsaData;
VersionRequested = MAKEWORD(2, 2);
Error = WSAStartup(VersionRequested, &WsaData);
if (Error != 0)
return FALSE;
else {
if (LOBYTE(WsaData.wVersion) != 2 || HIBYTE(WsaData.wHighVersion) != 2)
{
WSACleanup();
return FALSE;
}
}
return TRUE;
}