整数IP↔字符串IP相互转换

整数IP -> 字符串IP

void ip_to_string (ulong y, char *s) { int x = ntohl (y); sprintf (s, "%d.%d.%d.%d", (int) ((x >> 24) & 0xff), (int) ((x >> 16) & 0xff), (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) ); }

字符串IP -> 整数IP

int string_to_ip (const char* s) { char* token = NULL; int nIP = 0; char strIP[16]; memcpy(strIP, s, strlen(s)); strIP[strlen(s)] = '\0'; token = strtok(strIP, "."); if(NULL == token) return 0; nIP |= atoi(token); for(int i=1; i<4; i++) { if(NULL == (token = strtok(NULL, "."))) return 0; nIP |= (atoi(token) << (8*i)); } return nIP; }