c - function with struct parameter and its inside objects -

I searched with my problem but no success

I do not know how the proper function is implemented IFhost () .

Well I have a file library file in which I store the variable and the function iphost () .

There is another file called main.c where I play the function iphost (...) .

I do not really know how to fix my problem.

I got the error adr_srvr not the element sin_addr .

 / home / user / desktop / pap_lab2 / 2 /biblioteka.h|23 Terror: request for member ???? Sin_addrâ ???? Some do not have structure or association.  
 Maybe I have declared strong logic with that star signs and empires  Can anyone help me?  
   & Amp; Amp; * Arg & lt; = (Four) '9') {printf ("Paradopodobny Viprovodozono IP:% s \ n", RGR); Inet_aton (arg, and adr_srvr.sin_addr); // here ERROR srvr_addr = inet_ntoa (adr_srvr.sin_addr); }}   
 main.c  
  iphost (argv [2], and adr_srvr); // Fine ?   
 Very little support to reduce the code: 
 I can not go to adr_srvr.sin_addr. 
 char * arg is the argument to input by me, 4 example: "127.0.0.1". 
 adr_srvr.sin_addr This store is 127.0.0.1 
 srvr_addr char * 
  
 The normal code that works fine (without functon) is in main.c: 
 < / P> 
  int main (int argc, char * argv []) {int z; Int x; Char * srvr_addr; Struct sockaddr_in adr_srvr; Struct sockaddr_in adr; Host Host * He; Int len_inet; Ints; Four Degrams [512]; Struct in_addr ** addr_list; Four buff [512]; // USTV ENE POLSENIA // CGE YPISANO IP if (RGR [1] [0]> gt (=) '0' and ampv; [1] [0] & lt; = (four) '9') {printf (" Paradeopodobany Viprovodozono IP:% s \ n ", RGR [1]); Inet_aton (argv [1], and adr_srvr.sin_addr); Srvr_addr = inet_ntoa (adr_srvr.sin_addr); } And {} ...}   
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 I have such a question, so I edit here. How do I implement it in the function?  
  else {if (get = gethostbyname (arg)) == NULL) // // Get host information header ("gethostbyname"); Return 2; } // Print information about this host: printf ("wiki HOST: '% s'", arg); Printf ("IP:"); Addr_list = (Straight in_ADD **) that-> H_ADR_list; Printf ("% s", srvr_addr = inet_ntoa (* addr_list [0])); Printf ("\ n"); }    
 
 
  adr_srvr  is an indicator to access your fields For, you need to use  adr_srvr.sin_addr  instead of  adr_srvr-> sin_addr . In general, use  a. Field  when  a  is a straight, and  a-> field  when  a  is an indicator for a structure.