C++ IP和int值之间的转换

C++ IP和int值之间的转换

正常可见IP 为 127.0.0.1
实际存储为整形就是将IP的四个整数放到整形对应的四个字节上

#define _IP_MARK "."//IP转换成int
unsigned int IPtoINT(const string & strIP)
{unsigned int nRet = 0;char chBuf[16] = "";memcpy_s(chBuf, 15, strIP.c_str(), 15);char* szBufTemp = NULL;char* szBuf = strtok_s(chBuf,_IP_MARK,&szBufTemp);int i = 0;//计数while(NULL != szBuf)//取一个{nRet += atoi(szBuf)<<((3-i)*8);szBuf = strtok_s(NULL,_IP_MARK,&szBufTemp);i++;}return nRet;
}//int转换成IP
string INTtoIP(uint32_t num)
{  string strRet = "";  for (int i=0;i<4;i++)  {  uint32_t tmp=(num>>((3-i)*8))&0xFF;  char chBuf[8] = "";_itoa_s(tmp, chBuf, 10);strRet += chBuf;if (i < 3){strRet += _IP_MARK;}}  return strRet;  
}