VC 获取本机路由表 相当于命令route print

PMIB_IPFORWARDTABLE MyGetIpForwardTable(BOOL bOrder)
{
 PMIB_IPFORWARDTABLE pIpRouteTab = NULL;
 DWORD dwActualSize = 0;

 // 查询所需缓冲区的大小
 if(::GetIpForwardTable(pIpRouteTab, &dwActualSize, bOrder) == ERROR_INSUFFICIENT_BUFFER)
 {
  // 为MIB_IPFORWARDTABLE结构申请内存
  pIpRouteTab = (PMIB_IPFORWARDTABLE)::GlobalAlloc(GPTR, dwActualSize);
  // 获取路由表
  if(::GetIpForwardTable(pIpRouteTab, &dwActualSize, bOrder) == NO_ERROR)
   return pIpRouteTab;
  ::GlobalFree(pIpRouteTab);
 }
 return NULL;
}
void PrintIpForwardTable()
{
 PMIB_IPFORWARDTABLE pIpRouteTable = MyGetIpForwardTable(TRUE);
 if(pIpRouteTable != NULL)
 {
  DWORD i, dwCurrIndex;
  struct in_addr inadDest;
  struct in_addr inadMask;
  struct in_addr inadGateway; 
  PMIB_IPADDRTABLE pIpAddrTable = NULL;

  char szDestIp[128];
  char szMaskIp[128];
  char szGatewayIp[128];

  printf("Active Routes:\n\n");

  printf("  Network Address          Netmask  Gateway Address        Interface  Metric\n");
  for (i = 0; i < pIpRouteTable->dwNumEntries; i++)
  {
   dwCurrIndex = pIpRouteTable->table[i].dwForwardIfIndex;

   // 目的地址
   inadDest.s_addr = pIpRouteTable->table[i].dwForwardDest;
   // 子网掩码
   inadMask.s_addr = pIpRouteTable->table[i].dwForwardMask;
   // 网关地址
   inadGateway.s_addr = pIpRouteTable->table[i].dwForwardNextHop;

   strcpy(szDestIp, inet_ntoa(inadDest));
   strcpy(szMaskIp, inet_ntoa(inadMask));
   strcpy(szGatewayIp, inet_ntoa(inadGateway));
   printf("  %15s %16s %16s %16d %7d\n",
    szDestIp,
    szMaskIp,
    szGatewayIp,
    pIpRouteTable->table[i].dwForwardIfIndex,    // 可以在此调用GetIpAddrTable获取索引对应的IP地址
    pIpRouteTable->table[i].dwForwardMetric1);
  }
  //MyFreeIpForwardTable(pIpRouteTable);
 }
}