广播通信
广播通信代码框架：1. 协议都是：
SOCKET s = ::socket(AF_INET, SOCK_DGRAM, 0);
2. 服务端设置选项
BOOL bBroadcast = TRUE;
::setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char*)&bBroadcast, sizeof(BOOL));
3. 服务端向255.255.255.255 这个广播地址发内容 客户端收听就可以了
服务端代码：
#include "InitSock.h"
#include <stdio.h>
VOID main()
{
CInitSock initSock;
SOCKET s = ::socket(AF_INET, SOCK_DGRAM, 0);
//设置广播就是设置这个选项
BOOL bBroadcast = TRUE;
::setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char*)&bBroadcast, sizeof(BOOL));
//设置广播地址
SOCKADDR_IN bcast;
bcast.sin_family = AF_INET;
bcast.sin_port = htons(4567);
bcast.sin_addr.S_un.S_addr = INADDR_BROADCAST; //::inet_addr("255.255.255.255");
printf("begin send the data:\r\n");
char sz[] = "this is the broadcast data";
while(TRUE)
{
::sendto(s, sz, sizeof(sz), 0, (sockaddr*)&bcast, sizeof(bcast));
::Sleep(5000);
}
}
客户端代码：
#include "InitSock.h"
#include <stdio.h>
VOID main()
{
CInitSock initSock;
SOCKET s = ::socket(AF_INET, SOCK_DGRAM, 0);
SOCKADDR_IN sin;
sin.sin_family = AF_INET;
sin.sin_port = ::htons(4567);
sin.sin_addr.S_un.S_addr = INADDR_ANY;
if (::bind(s, (sockaddr*)&sin, sizeof(sin)) == SOCKET_ERROR)
{
printf("bind error");
return;
}
printf("begin recv the broadcast data:\r\n");
char sz = {0};
SOCKADDR_IN addrRemote;
int nLen = sizeof(SOCKADDR_IN); //这里必须设置成这个大小
while (TRUE)
{
int nRet = ::recvfrom(s, sz, sizeof(sz), 0, (sockaddr*)&addrRemote, &nLen);
if (nRet > 0)
{
sz = '\0';
printf(sz);
}
}
}
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