UDP广播

来源：互联网发布：mysql解锁被锁定的表编辑：程序博客网时间：2024/04/27 22:03

发送

#include <Stdio.h>
#include <WinSock.h>

//////////////////////////////////////////////////////////////////////////

struct AfxInitSocket
{
AfxInitSocket()
{
  WSADATA wsaData;
  WSAStartup(MAKEWORD(1, 1), &wsaData);
}
~AfxInitSocket()
{
  WSACleanup();
}
} _AfxInitSocket;

//////////////////////////////////////////////////////////////////////////

int main(int argc, char *argv[])
{
bool bBroadcast = true;
SOCKET hSocket= socket(PF_INET, SOCK_DGRAM, 0);
setsockopt(hSocket, SOL_SOCKET, SO_BROADCAST, (char *) &bBroadcast, sizeof(bBroadcast));

SOCKADDR_IN addrUDP = { 0 };
addrUDP.sin_family  = AF_INET;
addrUDP.sin_port  = htons(0);
addrUDP.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(hSocket, (SOCKADDR *) &addrUDP, sizeof(addrUDP)) != 0) {
  return -1;
}

addrUDP.sin_family = AF_INET;
addrUDP.sin_port = htons(7001);
addrUDP.sin_addr.s_addr = htonl(INADDR_BROADCAST);

char szSendBuffer[] = "Hello, This is Server!";
sendto(hSocket, szSendBuffer, sizeof(szSendBuffer), 0, (SOCKADDR *) &addrUDP, sizeof(SOCKADDR_IN));
return 0;
}

//////////////////////////////////////////////////////////////////////////

接收

#include <Stdio.h>
#include <Conio.h>
#include <WinSock.h>

//////////////////////////////////////////////////////////////////////////

struct AfxInitSocket
{
AfxInitSocket()
{
  WSADATA wsaData;
  WSAStartup(MAKEWORD(1, 1), &wsaData);
}
~AfxInitSocket()
{
  WSACleanup();
}
} _AfxInitSocket;

//////////////////////////////////////////////////////////////////////////

int main(int argc, char *argv[])
{
SOCKADDR_IN addrUDP = { 0 };

addrUDP.sin_port = htons(7001);
addrUDP.sin_family = AF_INET;
addrUDP.sin_addr.s_addr = htonl(INADDR_ANY);

SOCKET hSocket = socket(AF_INET, SOCK_DGRAM, 0);
if (bind(hSocket, (SOCKADDR FAR *) &addrUDP, sizeof(addrUDP)) != 0) {
return -1;
}

int nTimeout = 1000; // 设置超时一秒
setsockopt(hSocket, SOL_SOCKET, SO_RCVTIMEO, (char *) &nTimeout, sizeof(nTimeout));
for (int i=0; i<20; ++i) {
  int nSize = sizeof(SOCKADDR_IN);
  int nRecvLength = 0;
  char szRecvBuffer[1024] = { 0 };

  nRecvLength = recvfrom(hSocket, szRecvBuffer, sizeof(szRecvBuffer), 0, (SOCKADDR *) &addrPeer, &nSize);
  if (nRecvLength != SOCKET_ERROR) {
   szRecvBuffer[nRecvLength] = 0;
   printf("Recv --- %s/n", szRecvBuffer);
  }
  else {
   printf("Timeout/n");
  }
}

return 0;
}

//////////////////////////////////////////////////////////////////////////