Thread: GetHostByName

Code:

#include <windows.h>
#include <cctype>
#include <iostream>
int main(){
//----------------------
// Declare and initialize variables
hostent* remoteHost;
char* host_name;
unsigned int addr;

//----------------------
// User inputs name of host
printf("Input name of host: ");

//----------------------
// Allocate 64 byte char string for host name
host_name = (char*) malloc(sizeof(char)*64);
fgets(host_name, 64, stdin);

// If the user input is an alpha name for the host, use gethostbyname()
// If not, get host by addr (assume IPv4)
if (isalpha(host_name[0])) {   /* host address is a name */
  // if hostname terminated with newline '\n', remove and zero-terminate 
  if (host_name[strlen(host_name)-1] == '\n') 
    host_name[strlen(host_name)-1] = '\0'; 
  remoteHost = gethostbyname(host_name);
}
else  { 
  addr = inet_addr(host_name);
  remoteHost = gethostbyaddr((char *)&addr, 4, AF_INET);
}

if (WSAGetLastError() != 0) {
  if (WSAGetLastError() == 11001)
  printf("Host not found...\nExiting.\n");
}
else{
  printf("error#:%ld\n", WSAGetLastError());
}
std::cout<<remoteHost.h_addr;
system("PAUSE");
// The remoteHost structure can now be used to
// access information about the host
}

Errors:

Code:

Kompilaator: Consoles
Building Makefile: "C:\Programs\Dev-Cpp\Makefile.win"
 make... käivitus
make.exe -f "C:\Programs\Dev-Cpp\Makefile.win" all
g++.exe -c Templates/solaris2.cpp -o Templates/solaris2.o -I"C:/PROGRAMS/DEV-CPP/lib/gcc/mingw32/3.4.2/include"  -I"C:/PROGRAMS/DEV-CPP/include/c++/3.4.2/backward"  -I"C:/PROGRAMS/DEV-CPP/include/c++/3.4.2/mingw32"  -I"C:/PROGRAMS/DEV-CPP/include/c++/3.4.2"  -I"C:/PROGRAMS/DEV-CPP/include"    -fno-access-control

Templates/solaris2.cpp: In function `int main()':
Templates/solaris2.cpp:40: error: `h_addr_list' has not been declared

Templates/solaris2.cpp:40: error: request for member of non-aggregate type before '[' token

Käivitus peatatud

The part of the winsock.h header file:

Code:

struct  hostent {
	char	*h_name;
	char	**h_aliases;
	short	h_addrtype;
	short	h_length;
	char	**h_addr_list;
#define h_addr h_addr_list[0]
};

the program has two problems.
1. it does not include winsock.h. you have to include that in addition to windows.h

2. remostHost is a pointer, so use pointer operator, not the dot operator.

Code:

std::cout<<remoteHost->h_addr;

Thanks

Well, I get illegal operation message :P