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Delphi source code for Internet/Lan >> Get computer name from IP address


Category: Internet/Lan
Title: Get computer name from IP address
Date added: 15.03.2006
Hits: 27369


uses
  WinSock;


function LocalIP: string;
type
  TaPInAddr = array[0..10] of PInAddr;
  PaPInAddr = ^TaPInAddr;
var
  phe: PHostEnt;
  pptr: PaPInAddr;
  Buffer: array[0..63] of Char;
  I: Integer;
  GInitData: TWSAData;
begin
  WSAStartup($101, GInitData);
  Result := '';
  GetHostName(Buffer, SizeOf(Buffer));
  phe := GetHostByName(buffer);
  if phe = nil then Exit;
  pPtr := PaPInAddr(phe^.h_addr_list);
  I := 0;
  while pPtr^[I] <> nil do
  begin
    Result := inet_ntoa(pptr^[I]^);
    Inc(I);
  end;
  WSACleanup;
end;


function IPAddrToName(IPAddr: string): string;
var
  SockAddrIn: TSockAddrIn;
  HostEnt: PHostEnt;
  WSAData: TWSAData;
begin
  WSAStartup($101, WSAData);
  SockAddrIn.sin_addr.s_addr := inet_addr(PChar(IPAddr));
  HostEnt := gethostbyaddr(@SockAddrIn.sin_addr.S_addr, 4, AF_INET);
  if HostEnt <> nil then
    Result := StrPas(Hostent^.h_name)
  else
    Result := '';
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage(IPAddrToName(LocalIp));
end;


function GetIPFromHost(const HostName: string): string;
type
  TaPInAddr = array[0..10] of PInAddr;
  PaPInAddr = ^TaPInAddr;
var
  phe: PHostEnt;
  pptr: PaPInAddr;
  i: Integer;
  GInitData: TWSAData;
begin
  WSAStartup($101, GInitData);
  Result := '';
  phe := GetHostByName(PChar(HostName));
  if phe = nil then Exit;
  pPtr := PaPInAddr(phe^.h_addr_list);
  i := 0;
  while pPtr^[i] <> nil do
  begin
    Result := inet_ntoa(pptr^[i]^);
    Inc(i);
  end;
  WSACleanup;
end;

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