/*** @file* IP address API (common IPv4 and IPv6)*/

 

1、u32_t ipaddr_addr(const char *cp);

　　把一个 字符串的 IP 地址转换成  ip4_addr_t 类型的IP。

1 /** 2  * Ascii internet address interpretation routine. 3  * The value returned is in network order. 4  * 5  * @param cp IP address in ascii representation (e.g. "127.0.0.1") 6  * @return ip address in network order 7  */ 8 u32_t 9 ipaddr_addr(const char *cp)10 {11   ip4_addr_t val;12 13   if (ip4addr_aton(cp, &val)) {14     return ip4_addr_get_u32(&val);15   }16   return (IPADDR_NONE);17 }

2、char *ip4addr_ntoa(const ip4_addr_t *addr);

　　把一个 ip4_addr_t 类型 的IP地址 转换 成 字符串形式！

1 /** 2  * Convert numeric IP address into decimal dotted ASCII representation. 3  * returns ptr to static buffer; not reentrant! 4  * 5  * @param addr ip address in network order to convert 6  * @return pointer to a global static (!) buffer that holds the ASCII 7  *         representation of addr 8  */ 9 char*10 ip4addr_ntoa(const ip4_addr_t *addr)11 {12   static char str[IP4ADDR_STRLEN_MAX];13   return ip4addr_ntoa_r(addr, str, IP4ADDR_STRLEN_MAX);14 }