lisatado de los servidores disponibles en mi red
 

Como bien dice el titulo me gustaria obtener un listado de los servidres sql disponibles en mi red.......no se, parece algo tan sencillo pero..........no caigo como hacerlo....gracias.

Bueno es un código antiguo, pero puedes probarlo. Coloca un Form, con un TButton y un Memo. El código de la Unit es el siguiente; Luego sólo te queda asignar el evento OnClick del TButton.

Código Delphi [-]
 unit Unit1_SQLServers;
 
 interface
 
 uses
   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
   Dialogs,
   Winsock, StdCtrls;
 
 // Put this constant in the start of your unit!
 Const
   Socket_WM_Hook = WM_User + 100;
 
 type
   TForm1 = class(TForm)
     Memo1: TMemo;
     Button1: TButton;
     procedure Button1Click(Sender: TObject);
   private
     { Private declarations }
     Procedure TCPSocket_WM_Hook(Var Msg: TMessage); Message Socket_WM_Hook;
     Procedure GetIPAddresses(List: TStrings);
     Procedure ListSQLServers(SQLList: TStrings);
   public
     { Public declarations }
   end;
 
 var
   Form1: TForm1;
 
 
 
 
 // This variable should be put inside your TForm class, but is not necessary!
 ConnectionStatus : Integer;
 
 
   Function WSAIoctl(s: TSocket; cmd: DWORD; lpInBuffer: PCHAR; dwInBufferLen:
     DWORD;
     lpOutBuffer: PCHAR; dwOutBufferLen: DWORD;
     lpdwOutBytesReturned: LPDWORD;
     lpOverLapped: POINTER;
     lpOverLappedRoutine: POINTER): Integer; stdcall; external 'WS2_32.DLL';
 
 implementation
 
 {$R *.dfm}
 
 Procedure TForm1.TCPSocket_WM_Hook(Var Msg: TMessage);
 Var
   InputSocket : TSocket;
   Selectevent : Word;
 
 Begin
    InputSocket := Msg.wParam;
    IF InputSocket <> Invalid_Socket Then
    Begin
       Selectevent := WSAGetSelectEvent(Msg.lParam);
 
       Case Selectevent of
         FD_READ    : ;
         FD_CONNECT : ConnectionStatus := 1;
         FD_CLOSE   : ConnectionStatus := 2;
       End;
    End;
 End;
 
 Procedure TForm1.GetIPAddresses(List: TStrings);
 Type
   sockaddr_gen = packed Record
                            AddressIn : sockaddr_in;
                            filler    : packed Array[0..7] of char;
                         End;
 
   INTERFACE_INFO = packed Record
                              iiFlags            : u_long; // Interface flags
                              iiAddress          : sockaddr_gen; // Interface address
                              iiBroadcastAddress : sockaddr_gen; // Broadcast address
                              iiNetmask          : sockaddr_gen; // Network mask
                           End;
 
 
 Const
   SIO_GET_INTERFACE_LIST = $4004747F;
 
 Var
   ErrorCode     : Integer;
   WSAData       : TWSAData;
   Sock          : TSocket;
   PtrA          : Pointer;
   Buffer        : Array[0..20] of INTERFACE_INFO;
   BytesReturned : U_Long;
   I             : Integer;
   NumInterfaces : Integer;
   pAddrInet     : SOCKADDR_IN;
   pAddrString   : pChar;
   S             : String;
 
 Begin
    List.Clear;
 
    ErrorCode := WSAStartup($0101, WSAData);
    IF (ErrorCode = 0) Then
    Begin
       Sock := Socket(AF_INET, SOCK_STREAM, 0);         // Open a socket
       IF (Sock <> INVALID_SOCKET) Then
       Begin
          PtrA := @bytesReturned;
          IF (WSAIoCtl(Sock, SIO_GET_INTERFACE_LIST, NIL, 0, @Buffer, 1024, PtrA, NIL, NIL) <> SOCKET_ERROR) Then
          Begin
             NumInterfaces := BytesReturned div SizeOf(INTERFACE_INFO);
             For I := 0 to NumInterfaces - 1 do        // For every interface
             Begin
                S := '';
 
                pAddrInet := Buffer[i].iiAddress.addressIn;           // IP ADDRESS
                pAddrString := inet_ntoa(pAddrInet.sin_addr);
                IF (StrPas(pAddrString) <> '127.0.0.1') Then
                Begin
                   S := S + pAddrString + ',';
 
                   pAddrInet := Buffer[i].iiNetMask.addressIn;           // SUBNET MASK
                   pAddrString := inet_ntoa(pAddrInet.sin_addr);
                   S := S + pAddrString;
 
                   List.Add(S);
                End;
             End;
          End;
          CloseSocket(Sock);
       End;
 
       WSACleanup;
    End;
 End;
 
 Procedure TForm1.ListSQLServers(SQLList: TStrings);
 
 
 
     Function GetNumber(S: String; Nr: Byte) : Word;
     Var
       T : Integer;
 
     Begin
        While (Nr > 1) do
        Begin
           T := Pos('.', S);
           IF (T = 0) Then T := Length(S)+1;
           Delete(S, 1, T);
 
           Dec(Nr);
        End;
 
        T := Pos('.', S);
        IF (T = 0) Then T := Length(S)+1;
        Result := StrtointDef(Copy(S, 1, T-1), 0);
        Delete(S, 1, T);
     End;
 
     Function IPOk(CurrentIP, SrvIP, SrvMask: String) : Boolean;
     Var
       T         : Integer;
       I, M, Num : Integer;
 
     Begin
        Result := True;
        For T := 1 to 4 do
        Begin
           I   := GetNumber(SrvIP, T);
           M   := GetNumber(SrvMask, T);
           Num := GetNumber(CurrentIP, T);
 
           IF (Num < (I and M)) or (Num > ((I and M)+(255-M))) Then Result := False;
        End;
     End;
 
     Function IsSQLServer(IP: String; var SQLName: String) : Boolean;
     Var
       Sock              : TSocket;
       SockAddr          : SockAddr_In;
       IP_Address_Array  : Array[0..32] of Char; // Don't need more than 15 though... ;)
       Error             : Integer;
       Timer             : TDateTime;
       HostEnt           : PHostEnt;
 
     Begin
        Result := False;
 
 
        Sock := Socket(PF_INET, SOCK_STREAM, 0);         // Open a socket
        IF (Sock <> INVALID_SOCKET) Then
        Begin
           Strpcopy(IP_Address_Array, IP);
 
           // ms-sql-s
           // 1433
           SockAddr.Sin_Addr.S_addr := Inet_Addr(IP_Address_Array);
           SockAddr.Sin_Port    := HtoNS(1433); // Service: 'ms-sql-s' ???
           SockAddr.Sin_Zero[0] := Char(0);
           SockAddr.Sin_Family  := AF_INET;
        End;
 
 
        // Set the socket into asynchronous mode, so it will trigger the wMsg
        //   event in the hWnd window when the connection has been made
        WSAAsyncSelect(Sock, self.Handle, Socket_WM_Hook, FD_READ or FD_CONNECT or FD_CLOSE);
 
 
        Error := Connect(Sock, TSockaddr(SockAddr), Sizeof(SockAddr));
        IF (Error = SOCKET_ERROR) Then
        Begin
           IF (WSAGetLastError = WSAEWOULDBLOCK) Then Error := 0;
        End
         Else Error := 0;
 
        IF (Error = 0) Then
        Begin
           ConnectionStatus := 0;
 
 
           // Set your own timeout value. I've had success with as low as 0.01 (10ms) ...
           // 0.1 = 100ms   0.2 = 200ms ...
           Timer := Now;
           While (ConnectionStatus = 0) and (Timer+(0.01/86400) > Now) do Application.ProcessMessages;
           Result := (ConnectionStatus = 1);
 
 
           IF (Result) Then
           Begin
              HostEnt := GetHostByAddr(@SockAddr.sin_addr.S_addr, 4, PF_INET);
              IF (Assigned(HostEnt)) Then
              Begin
                 SQLName := HostEnt.h_name;
              End
               Else SQLName := IP;
           End;
        End;
        CloseSocket(Sock);
     End;
 
 
 
 Var
   I, T    : Integer;
   BaseIP  : String;
   CurIP   : String;
   S       : String;
   IP      : String;
   Mask    : String;
   Error   : Integer;
   WSAData : TWSAData;
   SQLName : String;
   IPAddresses : TStringList;
 
 Begin
    IPAddresses := TStringList.Create;
 //   IPAddresses.Add('139.117.69.80,255.255.255.0');
    GetIPAddresses(IPAddresses);
 
 
    Error := WSAStartup($0101, WSAData);
    IF (Error = 0) Then
    Begin
       For I := 0 to IPAddresses.Count-1 do
       Begin
          S := IPAddresses.Strings[i];
          IP := Copy(S, 1, Pos(',', S)-1);
          Mask := Copy(S, Pos(',', S)+1, Length(S));
 
          // Create base IP address (first 3 numbers)...
          BaseIP := '';
          For T := 1 to 3 do BaseIP := BaseIP + IntToStr(GetNumber(IP, T))+'.';
 
          For T := 1 to 254 do // 0 & 255 is not valid IP addresses...
          Begin
             CurIP := BaseIP+IntToStr(T);
 
             IF (IPOk(CurIP, IP, Mask)) Then
             Begin
                IF (IsSQLServer(CurIP, SQLName)) Then
                Begin
                   SQLList.Add(SQLName);
                End;
             End;
             Application.ProcessMessages;
          End;
       End;
       WSACleanup;
    End;
 
    IPAddresses.Free;
 End;
 
 
 
 procedure TForm1.Button1Click(Sender: TObject);
 begin
   GetIPAddresses(Memo1.Lines);
   ListSQLServers(Memo1.Lines);
 MessageDlg('Done', mtInformation, [mbOK], 0);
 end;
 
 end.