Re: gethostbyaddr() does not return any info

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#1961

From: Hans Galema
Date: Tue, 15 May 2007 09:35

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Kris wrote:

> Does anybody know what I'm doing wrong ? 

You forgot to initialise.

The Windows Sockets WSAStartup function initiates use of the Windows Sockets DLL by a process

> char host_name[]="172.16.0.102";

How terrible to call an ip-address a hostname!

Add some code before and afther what you already have:

   WORD wVersionRequested =MAKEWORD( 1,1);
   WSADATA wsaData;
   long res=WSAStartup( wVersionRequested, &wsaData );
   if(res)
      {
      ShowMessage ( "res so return;" );
      return;
      }

   char ipaddr [] = "172.16.0.102";

   unsigned long inaddr = inet_addr ( ipaddr );

   hostent *myhostent =  gethostbyaddr( (const char FAR *)&inaddr, sizeof ( in_addr ), 0 );

   if ( myhostent ) ShowMessage ( ipaddr + AnsiString ( "\n\n" ) + myhostent->h_name );
   else
      ShowMessage ( ipaddr + AnsiString ( "\n\n" ) + "no myhostent" );

   WSACleanup();

Hans.

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