How to compare ip address

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 CString  ip_start = ctlList.GetItemText(row, s_cnIpFilterRangeStart);
     
 CString ip_end = ctlList.GetItemText(row, s_cnIpFilterRangeEnd);
here i am getting ip address and storing into strings.
when i am giving like below i should through some waringing
ip_start = 11.1.1.1
ip_end  = 1.1.1.1
could you please suggest me here

What I have tried:

rightnow i have checked only ip validation it means when user gives IP address as 111111 then i am thorwing as error
but now my request is need compare both

for validation i did below one

ValidateIP(CString input)
{
    int retVal = FALSE;
    CString m_LocalIPaddress("0.0.0.0");
    CString m_BroadCastIPaddress("255.255.255.255");
    std::string s_input(CW2A(input.GetString()));
    std::regex pattern("[0-9][0-9a-zA-Z_!@#$%^&*()+=,.<>':;]*");
    if ((input.Compare(m_LocalIPaddress) == 0) || (input.Compare(m_BroadCastIPaddress) == 0))
    {
        return EParseResult::ENUM_NOT_SUPPORTED;
    }
    else if (std::regex_match(s_input, pattern) || (input.Find(_T(":"), 0) != RET_FAILURE))
    {
        if (input.Find(_T(".")) != RET_FAILURE)
        {
            struct sockaddr_in sa;
            retVal = InetPton(AF_INET, input, &(sa.sin_addr));
            if (retVal == RET_VALID_IP)
            {
                return EParseResult::ENUM_VALID_IPV4;
            }
        }
        else if (input.Find(_T(":")) != RET_FAILURE)
        {
            struct sockaddr_in6 sa;
            retVal = InetPton(AF_INET6, input, &(sa.sin6_addr));
            if (retVal == RET_VALID_IP)
            {
                return EParseResult::ENUM_VALID_IPV6;
            }
        }
    }
    else
    {
       return EParseResult::ENUM_IS_FQDN;
    }

so same way i ave to cck start sould is less tan end ip

Posted 13-Jul-17 0:40am

Member 13089825

Updated 29-Aug-17 20:58pm

v2

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Comments

Afzaal Ahmad Zeeshan 13-Jul-17 7:42am

How are you comparing, or for what purpose? Plus 11.1.1.1 will only be stored in a string, you cannot store this in float (it can hold one decimal place, right?). Can you be more specific than this?

Member 13089825 13-Jul-17 7:48am

it will stored as "11.1.1.1" because ctlList.GetItemText(row, s_cnIpFilterRangeEnd);will be rturn cstring
i want to compare for less than or greater than purpose

Richard MacCutchan 13-Jul-17 8:44am

Parse the string into its four component values and then compare them one by one.

Member 13089825 14-Jul-17 6:47am

if possible could you please provide some example for ip address parsing

Richard MacCutchan 14-Jul-17 7:12am

mfc ip address control - Google Search[^]

Member 13089825 17-Jul-17 3:22am

hi thank you for quick reply.
the link you have provide is for ip address control but in my case im storing ip address in to strings so i have to parse the sting and need to compare.
if you have any example on this could you please help me.

Richard MacCutchan 17-Jul-17 3:51am

Just split it into tokens, convert each token to an integer and test each one for consistency.

Member 13089825 18-Jul-17 2:03am

thank you its working now

2 solutions

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forest-321 · Answer 1 · 2017-08-29T18:04:00

It can be compared with dword type.
For example, you can use follow macros.

C++

#define str2dword(sip, ip) { \
	DWORD _2, _3, _4; \
	_stscanf_s(sip, _T("%d.%d.%d.%d"), &ip, &_2, &_3, &_4);	\
	ip = ip | (_2 << 8);			\
	ip = ip | (_3 << 16);			\
	ip = ip | (_4 << 24);			\
}
#define I4V2IP(a, b, c, d) ((DWORD)(a) | ((DWORD)(b)<<8) | ((DWORD)(c)<<16) | ((DWORD)(d)<<24))

CPallini · Answer 2 · 2017-08-29T20:58:00

Solution 2

Extract the octects (bytes) from the IP strings (you may find many examples just Googling[^]) and then compare them.

Posted 29-Aug-17 20:58pm

CPallini