Статьи Королевства Дельфи


Библиотека для работы с LAN.


Раздел Сокровищница Alex, 09 апреля 2001г.

unit NetProcs; interface uses Classes, Windows; type TAdapterStatus = record adapter_address: array [0..5] of Char; filler: array [1..4*SizeOf(Char)+19*SizeOf(Word) +3*SizeOf(DWORD)] of Byte; end; THostInfo = record username: PWideChar; logon_domain: PWideChar; oth_domains: PWideChar; logon_server: PWideChar; end;{record} function IsNetConnect : Boolean; {Возвращает TRUE если компьютер подключен к сети, иначе - FALSE} function AdapterToString(Adapter: TAdapterStatus): string; {Преобразует MAC адес в привычный xx-xx-xx-xx} function GetMacAddresses(const Machine: string; const Addresses: TStrings): Integer; {Заполняет Addresses MAC-адресами компьютера с сетевым именем Machine. Возвращает число МАС адресов на компьютере} function GetNetUser(HostName: WideString): THostInfo; {Возвращает LOGIN текущего пользователя на HOSTNAME компьютере} implementation uses NB30, SysUtils; function IsNetConnect : Boolean; begin if GetSystemMetrics(SM_NETWORK) AND $01 = $01 then Result:= True else Result:= False; end;{function} function AdapterToString(Adapter: TAdapterStatus): string; begin with Adapter do Result := Format('%2.2x-%2.2x-%2.2x-%2.2x-%2.2x-%2.2x', [ Integer(adapter_address[0]), Integer(adapter_address[1]), Integer(adapter_address[2]), Integer(adapter_address[3]), Integer(adapter_address[4]), Integer(adapter_address[5])]); end;{function} function GetMacAddresses(const Machine: string; const Addresses: TStrings): Integer; const NCBNAMSZ = 16; // absolute length of a net name MAX_LANA = 254; // lana's in range 0 to MAX_LANA inclusive NRC_GOODRET = $00; // good return NCBASTAT = $33; // NCB ADAPTER STATUS NCBRESET = $32; // NCB RESET NCBENUM = $37; // NCB ENUMERATE LANA NUMBERS type PNCB = ^TNCB; TNCBPostProc = procedure (P: PNCB); stdcall; TNCB = record ncb_command: Byte; ncb_retcode: Byte; ncb_lsn: Byte; ncb_num: Byte; ncb_buffer: PChar; ncb_length: Word; ncb_callname: array [0..NCBNAMSZ - 1] of Char; ncb_name: array [0..NCBNAMSZ - 1] of Char; ncb_rto: Byte; ncb_sto: Byte; ncb_post: TNCBPostProc; ncb_lana_num: Byte; ncb_cmd_cplt: Byte; ncb_reserve: array [0..9] of Char; ncb_event: THandle; end; PLanaEnum = ^TLanaEnum; TLanaEnum = record length: Byte; lana: array [0..MAX_LANA] of Byte; end; ASTAT = record adapt: TAdapterStatus; namebuf: array [0..29] of TNameBuffer; end; var NCB: TNCB; Enum: TLanaEnum; I: Integer; Adapter: ASTAT; MachineName: string; begin Result := -1; Addresses.Clear; MachineName := UpperCase(Machine); if MachineName = '' then MachineName := '*'; FillChar(NCB, SizeOf(NCB), #0); NCB.ncb_command := NCBENUM; NCB.ncb_buffer := Pointer(@Enum); NCB.ncb_length := SizeOf(Enum); if Word(NetBios(@NCB)) = NRC_GOODRET then begin Result := Enum.Length; for I := 0 to Ord(Enum.Length) - 1 do begin FillChar(NCB, SizeOf(TNCB), #0); NCB.ncb_command := NCBRESET; NCB.ncb_lana_num := Enum.lana[I]; if Word(NetBios(@NCB)) = NRC_GOODRET then begin FillChar(NCB, SizeOf(TNCB), #0); NCB.ncb_command := NCBASTAT; NCB.ncb_lana_num := Enum.lana[i]; StrLCopy(NCB.ncb_callname, PChar(MachineName),NCBNAMSZ); StrPCopy(@NCB.ncb_callname[Length(MachineName)], StringOfChar(' ', NCBNAMSZ - Length(MachineName))); NCB.ncb_buffer := PChar(@Adapter); NCB.ncb_length := SizeOf(Adapter); if Word(NetBios(@NCB)) = NRC_GOODRET then Addresses.Add(AdapterToString(Adapter.adapt)); end; end; end; end;{function} function NetWkstaUserEnum(servername: PWideChar; level : DWord; var bufptr: Pointer; prefmaxlen: DWord; var entriesread: PDWord; var totalentries: PDWord; var resumehandle: PDWord ): LongInt ; stdcall; external 'netapi32.dll' name 'NetWkstaUserEnum'; function GetNetUser(HostName: WideString): THostInfo; var Info: Pointer; ElTotal: PDWord; ElCount: PDWord; Resume: PDWord; Error: LongInt; begin Resume:=0; NetWkstaUserEnum(PWideChar(HostName),1, Info,0, ElCount,ElTotal,Resume); Error:=NetWkstaUserEnum(PWideChar(HostName),1,Info,256*Integer(ElTotal), ElCount,ElTotal,Resume); case Error of ERROR_ACCESS_DENIED: Result.UserName:= 'ERROR - ACCESS DENIED'; ERROR_MORE_DATA: Result.UserName:= 'ERROR - MORE DATA'; ERROR_INVALID_LEVEL: Result.UserName:= 'ERROR - INVALID LEVEL'; else if Info <> nil then Result:=THostInfo(info^) else begin Result.username:= '???'; Result.logon_domain:= '???'; Result.oth_domains:= '???'; Result.logon_server:= '???'; end;{if} end;{case} end; {function} end.




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