How can I get IP Addressess and machine names of all the machines in LAN

uses
  Winsock;

{...}

function getIPs: Tstrings;
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 := TstringList.Create;
  Result.Clear;
  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.Add(inet_ntoa(pptr^[I]^));
    Inc(I);
  end;
  WSACleanup;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  Memo1.Lines := GetIps;
end;

Check out the API function NetServerEnum();

HTH
DragonSlayer

listening...

Hi Akazukin,

I tried out your code which returns only one ip that's of my machine in which I am executing the code.

Let me explain you the situation.

1.  I have 5 work groups.
2.  And in each of the group there are atleast 5 machines.
3.  In my work group there are 5 machines.

I need all the machines in LAN which are up.
It's very urgent can ne one please help me ???

Kiran.

Hi DragonSlayer,

I tryied out the API function NetServerEnum();
I don't know how to execute that I read the help fro that, but there is no example for that also.

Could you please help me by giving the syntax and execution procedure that helpful.

Regards,
Kiran.

you need a socket component that supports broadcast.

if you have for example a class c network, eg 192.168.0.X,
then the netmask is 255.255.255.0, same for the broadcast mask. If you set the broadcast mask to 255.255.255.128, then you will only broadcast to the upper half of the network for example. The whole point of broadcast is you don't need to know who is listening, maybe no-one is. Like a radio station will still broadcast, even if every radio receiver is turned off, and they don't know/care who is 'out there'

Mark

Hi mullet_attack,

That is precisely why I want to know that how many machines are switched on.
If the machines are switched on and logged on my exe containing the Server socket will be up then what ever message I send across through the client socket only those machine will receive it.

The problem now is I don't know whether the machine is on or not I am sending the message and the error Asynchronous socket error 10060, Which I am trying to avoid. So, I have a point there.

P.S. You cannot use socket component to broadcast by using netmask. You can talk to only one machine at a time.

Regards,
Kiran.

I'm missing something here, i think...

is this right : ?

you have a PC, with your exe running, that exposes a server socket. Other machines (clients) connect to this server. you want to send a message from the server to all the client machines that are currently connected.

BTW, which socket component/s are you using?

Mark

and here's the source for the form

object Form1: TForm1
  Left = 192
  Top = 103
  Width = 338
  Height = 258
  Caption = 'Server Enum'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object Label1: TLabel
    Left = 126
    Top = 16
    Width = 24
    Height = 13
    Caption = 'Total'
  end
  object Label2: TLabel
    Left = 126
    Top = 32
    Width = 26
    Height = 13
    Caption = 'Read'
  end
  object lblTotal: TLabel
    Left = 166
    Top = 16
    Width = 6
    Height = 13
    Caption = '0'
  end
  object lblRead: TLabel
    Left = 166
    Top = 32
    Width = 6
    Height = 13
    Caption = '0'
  end
  object Button1: TButton
    Left = 14
    Top = 16
    Width = 75
    Height = 25
    Caption = 'Refresh'
    TabOrder = 0
    OnClick = Button1Click
  end
  object ListView1: TListView
    Left = 14
    Top = 64
    Width = 301
    Height = 150
    Columns = <
      item
        Caption = 'Name'
        Width = 130
      end
      item
        Caption = 'Comments'
        Width = 150
      end>
    ReadOnly = True
    TabOrder = 1
    ViewStyle = vsReport
  end
end

Oh, for the NetServerEnum function to work you need to download the Lan Manager translation from the Project JEDI site... get it from http://www.delphi-jedi.org/Jedi:APILIBRARY:41609



HTH
DragonSlayer.

This program uses one ClientSocket,Label,Button,EditBox components . Type the name of Computer in EditBox and program will show you IP Address of this Computer in Label .

unit UnitIP;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ScktComp, WinSock;

type
  TForm1 = class(TForm)
    ClientSocket1: TClientSocket;
    Button1: TButton;
    Label1: TLabel;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
function HostToIP(Name: string; var Ip: string): Boolean;
var
  wsdata : TWSAData;
  hostName : array [0..255] of char;
  hostEnt : PHostEnt;
  addr : PChar;
begin
  WSAStartup ($0101, wsdata);
  try
    gethostname (hostName, sizeof (hostName));
    StrPCopy(hostName, Name);
    hostEnt := gethostbyname (hostName);
    if Assigned (hostEnt) then
      if Assigned (hostEnt^.h_addr_list) then begin
        addr := hostEnt^.h_addr_list^;
        if Assigned (addr) then begin
          IP := Format ('%d.%d.%d.%d', [byte (addr [0]),
          byte (addr [1]), byte (addr [2]), byte (addr [3])]);
          Result := True;
        end
        else
          Result := False;
      end
      else
        Result := False
    else begin
      Result := False;
    end;
  finally
    WSACleanup;
  end
end;
procedure TForm1.Button1Click(Sender: TObject);
var IP: string;
begin
 if HostToIp(Edit1.Text, IP) then Label1.Caption := IP
end;

end.


Hope it will help you .
Best Regards Ferhad

kiranramesh:
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