...show the 'Choose Domain' dialog?

{
  If you are developing network software for Windows NT,
  you usually need to ask the user to select a computer or domain
  he wants to connect/login.
}

const
  FOCUSDLG_DOMAINS_ONLY = 1;
  FOCUSDLG_SERVERS_ONLY = 2;
  FOCUSDLG_SERVERS_DOMAINS = 3;
  FOCUSDLG_BROWSE_LOGON_DOMAIN = $00010000;
  FOCUSDLG_BROWSE_WKSTA_DOMAIN = $00020000;
  FOCUSDLG_BROWSE_OTHER_DOMAINS = $00040000;
  FOCUSDLG_BROWSE_TRUSTING_DOMAINS = $00080000;
  FOCUSDLG_BROWSE_WORKGROUP_DOMAINS = $00100000;
  FOCUSDLG_BROWSE_ALL_DOMAINS = FOCUSDLG_BROWSE_LOGON_DOMAIN or
    FOCUSDLG_BROWSE_WKSTA_DOMAIN or FOCUSDLG_BROWSE_OTHER_DOMAINS or
    FOCUSDLG_BROWSE_TRUSTING_DOMAINS or FOCUSDLG_BROWSE_WORKGROUP_DOMAINS;


function SystemFocusDialog(hwndOwner: HWND; dwSelectionFlag: UINT;
  wszName: PWideChar; dwBufSize: DWORD; var bOKPressed: Boolean;
  wszHelpFile: PWideChar; dwContextHelpId: DWORD): DWORD; stdcall;
  external 'ntlanman.dll' Name 'I_SystemFocusDialog';

function ComputerBrowser(hWndParent: HWND; wCompName: PWideChar;
  dwBufLen: DWORD): Boolean;
var
  dwError: DWORD;
begin
  Result := False;
  dwError := SystemFocusDialog(hWndParent, FOCUSDLG_SERVERS_DOMAINS or
    FOCUSDLG_BROWSE_ALL_DOMAINS,
    wCompName, dwBufLen, Result, nil, 0);
  if dwError <> NO_ERROR then Exit;
end;


procedure TForm1.Button1Click(Sender: TObject);
var
  wCompName: array [0..MAX_COMPUTERNAME_LENGTH + 1] of WideChar;
begin
  if ComputerBrowser(0, wCompName, MAX_COMPUTERNAME_LENGTH + 1) then
    ShowMessage(wCompName)
  else
    ShowMessage('no computer selected');
end;

{***************************}

// Show the ServerBrowseDialogA0 Dialog

type
  TServerBrowseDialogA0 = function(hwnd: HWND; pchBuffer: Pointer;
    cchBufSize: DWORD): bool;
  stdcall;

function ShowServerDialog(AHandle: THandle): string;
var
  ServerBrowseDialogA0: TServerBrowseDialogA0;
  LANMAN_DLL: DWORD;
  buffer: array[0..1024] of char;
  bLoadLib: Boolean;
begin
  LANMAN_DLL := GetModuleHandle('NTLANMAN.DLL');
  if LANMAN_DLL = 0 then
  begin
    LANMAN_DLL := LoadLibrary('NTLANMAN.DLL');
    bLoadLib := True;
  end;
  if LANMAN_DLL <> 0 then
  begin @ServerBrowseDialogA0 := GetProcAddress(LANMAN_DLL, 'ServerBrowseDialogA0');
    DialogBox(HInstance, MAKEINTRESOURCE(101), AHandle, nil);
    ServerBrowseDialogA0(AHandle, @buffer, 1024);
    if buffer[0] = '\' then
    begin
      Result := buffer;
    end;
    if bLoadLib then
      FreeLibrary(LANMAN_DLL);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  label1.Caption := ShowServerDialog(Form1.Handle);
end;

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