Enumerate hidden network shares

Which WinApi function do I use to enumerate hidden network shares, ie those suffixed $.

I use WNetOpenEnum and WNetEnumResource, but this only finds the visible shares.
JohnStevensonAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

DaFoxCommented:
Hi John,

NetShareEnum() does the trick. The WNet*() APIs don't show hidden devices, NetShareEnum() does. See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/netmgmt/netmgmt/netshareenum.asp

"You can also use the WNetEnumResource function to retrieve resource information. However, WNetEnumResource does not enumerate hidden shares or users connected to a share."

Regards,
Markus
0
JohnStevensonAuthor Commented:
Thanks Markus, that's what I need. I think I was put off by the following from the Windows SDK that ships with Delphi 7:

"The NetShareEnum function is obsolete. It is provided only for compatibility with LAN Manager and 16-bit versions of Windows. Win32-based applications should use the WNetEnumResource function."

I'll know in future to always look on the website.

Have you got a quick Delphi sample? Don't worry, I'll give you the points anyway. Thanks again.

Regards

John
0
DaFoxCommented:
John,

Below is an example I found on the net (it's not mine!). Basically:
- You have to link NetShareEnum() dynamically, since on 9x it is placed in svrapi.dll, on NT platform it's netapi32.dll
- There are several SHARE_INFO_* structs. Watch out that you take the right one, share_info_50 is for 9x use only, all the other structs are available on NT platform only
- SHI50F_SYSTEM ($0200) indicates a hidden share (share_info_50.shi50_flags) on 9x, a $ indicates a hidden share on NT

The code shows these differences in 9x/NT quite nice. It works fine on my Windows 2000, but once again: This code was not made by me, I just put all of it together (http://www.delphimaster.ru/articles/netmon/)

type
  TShareInfo2 = packed record
    shi2_netname      : PWChar;
    shi2_type            : DWORD;
    shi2_remark       : PWChar;
    shi2_permissions      : DWORD;
    shi2_max_uses         : DWORD;
    shi2_current_uses      : DWORD;
    shi2_path               : PWChar;
    shi2_passwd       : PWChar;
  end;
  PShareInfo2 = ^TShareInfo2;
  TShareInfo2Array = array [0..512] of TShareInfo2;
  PShareInfo2Array = ^TShareInfo2Array;

  TShareInfo50 = packed record
    shi50_netname       : array [0..12] of Char;
    shi50_type             : Byte;
    shi50_flags       : Word;
    shi50_remark       : PChar;
    shi50_path             : PChar;
    shi50_rw_password       : array [0..8] of Char;
    shi50_ro_password       : array [0..8] of Char;
  end;

// ...

  NetShareEnum: function(pszServer: PChar; sLevel: Cardinal; pbBuffer: PChar;
                         cbBuffer: Cardinal; pcEntriesRead,
                         pcTotalAvail: Pointer): DWord; stdcall;

  NetShareEnumNT: function(ServerName: PWChar; Level: DWord; Bufptr: Pointer;
                           Prefmaxlen: DWord; EntriesRead, TotalEntries,
                           resume_handle: LPDWord): DWord; stdcall;

// ...

procedure TForm1.Button1Click(Sender: TObject);

  function IsNT(var Value: Boolean): Boolean;
  var
    Ver: TOSVersionInfo;
    BRes: Boolean;
  begin
    Ver.dwOSVersionInfoSize := SizeOf(TOSVersionInfo);
    BRes := GetVersionEx(Ver);
    if not BRes then
    begin
      Result := False;
      Exit;
    end else
      Result := True;
    case Ver.dwPlatformId of
      VER_PLATFORM_WIN32_NT      : Value := True;   // Windows NT
      VER_PLATFORM_WIN32_WINDOWS : Value := False;  // Windows 9x-Me
      VER_PLATFORM_WIN32s        : Result := False; // Windows 3.x
    end;
  end;

var
  i: Integer;
  FLibHandle: THandle;
  ShareNT: PShareInfo2Array;
  entriesRead, totalEntries: DWord;
  Share: array [0..512] of TShareInfo50;
  pcEntriesRead,pcTotalAvail: Word;
  OS: Boolean;
begin
  ListBox.Items.Clear;
  if not IsNT(OS) then Close;

  if OS then begin // NT
    FLibHandle := LoadLibrary('NETAPI32.DLL');
    if FLibHandle = 0 then Exit;
    @NetShareEnumNT := GetProcAddress(FLibHandle,'NetShareEnum');
    if not Assigned(NetShareEnumNT) then
    begin
      FreeLibrary(FLibHandle);
      Exit;
    end;
    ShareNT := nil;
    if NetShareEnumNT(nil,2,@ShareNT,DWORD(-1),
             @entriesread,@totalentries,nil) <> 0 then
    begin
      FreeLibrary(FLibHandle);
      Exit;
    end;
    if entriesRead > 0 then
    for i:= 0 to entriesread - 1 do
            ListBox.Items.Add(String(ShareNT^[i].shi2_netname));

  end else
  begin //9x
    FLibHandle := LoadLibrary('SVRAPI.DLL');
    if FLibHandle = 0 then Exit;
    @NetShareEnum := GetProcAddress(FLibHandle,'NetShareEnum');
    if not Assigned(NetShareEnum) then
    begin
      FreeLibrary(FLibHandle);
      Exit;
    end;
    if NetShareEnum(nil,50,@Share,SizeOf(Share),
            @pcEntriesRead,@pcTotalAvail) <> 0 then
    begin
      FreeLibrary(FLibHandle);
      Exit;
    end;
    if pcEntriesRead > 0 then
    for i:= 0 to pcEntriesRead - 1 do
            ListBox.Items.Add(String(Share[i].shi50_netname));
  end;
  FreeLibrary(FLibHandle);
end;

Markus
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Delphi

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.