把10进制的ip地址转换为16进制

把10进制的ip地址转换为16进制，如可以把"192.168.2.33"转换为0xC0A80221...

int converIntAddToHexAdd(string &intIP,char *buffer)
{
	int temp = 0;
	if(intIP.empty())
	{
		cout << "The int IP address is empty." << endl;
		return -1;
	}
	for(string::iterator iter = intIP.begin();iter != intIP.end();iter ++)
	{
		if(*iter == '.')temp++;
	}
	if(temp != 3)
	{
		cout << "wrong format int IP address." << endl;
		return -1;
	}
	string newStr = intIP + '.';
	int beginMark = 0,midInt,offset = 0;
	for(int num =0;num < 4;num ++)
	{
		temp = newStr.find_first_of('.',beginMark);
		string tempStr = newStr.substr(beginMark,temp);
		beginMark = temp +1;
		midInt = atoi(tempStr.c_str());
		if((midInt < 0)||(midInt > 255))return -1;
		if(midInt >= 16)
			sprintf(buffer + offset,"%x",midInt);
		else
			sprintf(buffer + offset,"0%x",midInt);
		offset += 2;
	}
	return 0;
}