How to convert string to IP address and vice versa

Question

how can I convert a string ipAddress  struct in addr  and vice versa  and how do I turn in unsigned long ipAddress  thanks

User · Answer

I m not sure if I understood the question properly   Anyway  are you looking for this   std  string ip   192 168 1 54   std  stringstream s ip   int a b c d    to store the 4 ints char ch    to temporarily store the     s  gt  gt  a  gt  gt  ch  gt  gt  b  gt  gt  ch  gt  gt  c  gt  gt  ch  gt  gt  d  std  cout  lt  lt  a  lt  lt        lt  lt  b  lt  lt        lt  lt  c  lt  lt       lt  lt  d    Output   192  168  1  54

User · Answer

To convert string to in-addr   in addr maskAddr  inet aton netMaskStr   amp maskAddr     To convert in addr to string   char saddr INET ADDRSTRLEN   inet ntop AF INET   amp inaddr  saddr  INET ADDRSTRLEN

User · Answer

I was able to convert string to DWORD and back with this code   char strAddr      127 0 0 1  DWORD ip   inet addr strAddr      ip contains 16777343  0x0100007f in hex   struct in addr paddr  paddr S un S addr   ip   char  strAdd2   inet ntoa paddr      strAdd2 contains the same string as strAdd   I am working in a maintenance project of old MFC code  so converting deprecated functions calls is not applicable

User · Answer

inet ntoa   converts a in addr to string      The inet ntoa function converts an    Ipv4  Internet network address into   an ASCII string in Internet standard   dotted-decimal format    inet addr   does the reverse job     The inet addr function converts a   string containing an IPv4   dotted-decimal address into a proper   address for the IN ADDR structure   PS this the first result googling  in addr to string

User · Answer

This example shows how to convert from string to ip  and viceversa   struct sockaddr in sa  char ip saver INET ADDRSTRLEN       store this IP address in sa  inet pton AF INET   192 0 1 10    amp  sa sin addr        now get it back  sprintf ip saver    s   sa sin addr        prints  192 0 2 10  printf   s n   ip saver

User · Answer

The third inet pton parameter is a pointer to an in addr structure   After a successful inet pton call  the in addr structure will be populated with the address information   The structure s S addr field contains the IP address in network byte order  reverse order    Example      include  lt arpa inet h gt  uint32 t NodeIpAddress  getIPv4AddressInteger std  string IPv4Address        int result      uint32 t IPv4Identifier   0      struct in addr addr         store this IP address in sa      result   inet pton AF INET  IPv4Address c str     amp  addr        if  result    -1             gpLogFile- gt Write LOGPREFIX  LogFile  LOGLEVEL ERROR   T  Failed to convert IP  hs to IPv4 Address  Due to invalid family of  d  WSA Error of  d    IPv4Address c str    AF INET  result             else if  result    0            gpLogFile- gt Write LOGPREFIX  LogFile  LOGLEVEL ERROR   T  Failed to convert IP  hs to IPv4    IPv4Address c str               else           IPv4Identifier   ntohl    uint32 t    amp  addr               return IPv4Identifier

User · Answer

Use inet ntop   and inet pton   if you need it other way around  Do not use inet ntoa    inet aton   and similar as they are deprecated and don t support ipv6  Here is a nice guide with quite a few examples     IPv4 demo of inet ntop   and inet pton    struct sockaddr in sa  char str INET ADDRSTRLEN       store this IP address in sa  inet pton AF INET   quot 192 0 2 33 quot    amp  sa sin addr        now get it back and print it inet ntop AF INET   amp  sa sin addr   str  INET ADDRSTRLEN    printf  quot  s n quot   str      prints  quot 192 0 2 33 quot

User · Answer

Hexadecimal IP Address to String IP   include  lt iostream gt   include  lt sstream gt  using namespace std   int main         uint32 t ip   0x0AA40001      string ip str         int temp   0      for  int i   0  i  lt  8  i             if  i   2    0                        temp    ip  amp  15              ip   ip  gt  gt  4                    else                       stringstream ss              temp     ip  amp  15    16              ip   ip  gt  gt  4              ss  lt  lt  temp              ip str   ss str         ip str              temp   0                      ip str pop back        cout  lt  lt  ip str      Output 10 164 0 1

User · Answer

here s easy-to-use  thread-safe c   functions to convert uint32 t native-endian to string  and string to native-endian uint32 t     include  lt arpa inet h gt     inet ntop  amp  inet pton  include  lt string h gt     strerror r  include  lt arpa inet h gt     ntohl  amp  htonl using namespace std     im lazy  string ipv4 int to string uint32 t in  bool  const success   nullptr        string ret INET ADDRSTRLEN    0        in   htonl in       const bool  success    NULL    inet ntop AF INET   amp in   amp ret 0   ret size          if  success                 success    success            if   success                ret pop back       remove null-terminator required by inet ntop           else if   success                char buf 200     0           strerror r errno  buf  sizeof buf            throw std  runtime error string  error converting ipv4 int to string      to string errno    string         string buf              return ret       return is native-endian    when an error occurs  if success ptr is given  it s set to false  otherwise a std  runtime error is thrown  uint32 t ipv4 string to int const string  amp in  bool  const success   nullptr        uint32 t ret      const bool  success    1    inet pton AF INET  in c str     amp ret        ret   ntohl ret       if  success                 success    success            else if    success                char buf 200     0           strerror r errno  buf  sizeof buf            throw std  runtime error string  error converting ipv4 string to int      to string errno    string         string buf              return ret      fair warning  as of writing  they re un-tested  but these functions are exactly what i was looking for when i came to this thread

[c++] How to convert string to IP address and vice versa

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