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根据IP和Mask获得子网地址
unsigned int IPToUInt(const char *pIp) { int a,b,c,d; unsigned int addr=0; if( sscanf(pIp,"%d.%d.%d.%d",&a,&b,&c,&d)!=4 ) return 0; addr=a<<24; addr|=b<<16; addr|=c<<8; addr|=d; return addr; }
char* pIp,char *pMask
。。。
unsigned int ip = IPToUInt(pIp);
unsigned int mask= IPToUInt(pMask);
unsigned int net_lower=( ip & mask );
unsigned int net_upper=( net_lower | (~mask) );
unsigned long m_lsubnet=net_upper;
。。。
struct sockaddr_in subnet_addr;
subnet_addr.sin_family=AF_INET;
subnet_addr.sin_addr.s_addr=pLSearch->m_lsubnet;//inet_addr("255.255.255.255");//inet_addr(pLSearch->m_subip);
subnet_addr.sin_port=htons(BROADCAST_SEND_PORT_L);
根据IP和Mask获得子网地址,布布扣,bubuko.com
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原文地址:http://www.cnblogs.com/tiancun/p/3868329.html