Библиотека для работы с LAN

 
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Delphi, Kylix and Pascal
ava
Alex | 06.11.2004, 18:57

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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