Knowledge Base Nr: 00033 ping.cpp - http://www.swe-kaiser.de

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Win32: 'ping'en von name oder ip-nummer mit timeout
achtung: icmp.lib, ipexport.h, icmpapi.h von microsoft müssen aus dem internet nachgeladen werden!

  
#include <stdafx.h>
#include <ras.h>
#include <winsock.h>

#pragma comment(lib, "C:/Program Files/Microsoft Visual Studio/VC98/Lib/RASAPI32.LIB")

extern "C" {
#include "icmp\ipexport.h"
#include "icmp\icmpapi.h"
}

#pragma comment(lib, "/projects/msvc60/cpp_classes/icmp/icmp.lib")

int Ping(const char* szHostAddr, int nTimeOut)
{
  IPAddr ip;

  hostent* phostent;
  if( szHostAddr[0] <= '9')
    ip = (IPAddr)inet_addr(szHostAddr);
  else
  {
    phostent = gethostbyname(szHostAddr); //may take serveral seconds!
    if (!phostent)
    return -1;

  ip = *(DWORD*)(*phostent->h_addr_list);
  }

  HANDLE icmphandle = IcmpCreateFile();
  if (!icmphandle)
    return -2;

  char reply[sizeof(icmp_echo_reply)+8];

  icmp_echo_reply* iep = (icmp_echo_reply*)&reply;
  iep->RoundTripTime = 0xffffffff;

  IcmpSendEcho(icmphandle,ip,0,0,NULL,reply,sizeof(icmp_echo_reply)+8, nTimeOut);
  int nErr = ::GetLastError();

  IcmpCloseHandle(icmphandle);

  return nErr ? -3 : iep->RoundTripTime;
}