var
Computer: array[1..500] of string[25];
ComputerCount: Integer;

procedure FindAllComputers(Workgroup: string);
var
EnumHandle: THandle;
WorkgroupRS: TNetResource;
Buf: array[1..500] of TNetResource;
BufSize: Integer;
Entries: Integer;
Result: Integer;
begin
ComputerCount := 0;
Workgroup := Workgroup + #0;
FillChar(WorkgroupRS, SizeOf(WorkgroupRS), 0);
with WorkgroupRS do
begin
dwScope := 2;
dwType := 3;
dwDisplayType := 1;
dwUsage := 2;
lpRemoteName := @Workgroup[1];
end;
WNetOpenEnum(RESOURCE_GLOBALNET,
RESOURCETYPE_ANY,
0,
@WorkgroupRS,
EnumHandle);
repeat
Entries := 1;
BufSize := SizeOf(Buf);
Result :=
WNetEnumResource(EnumHandle,
Entries,
@Buf,
BufSize);
if (Result = NO_ERROR) and (Entries = 1) then
begin
Inc(ComputerCount);
Computer[ComputerCount] := StrPas(Buf[1].lpRemoteName);
end;
until (Entries <> 1) or (Result <> NO_ERROR);
WNetCloseEnum(EnumHandle);
end; { Find All Computers }

////////////////////////////////////////////////////////////////////////////////
//
// Демонстрационная программа сканирования сети на основе
// WNetOpenEnum, WNetEnumResource, WNetCloseEnum
//
// Автор: Александр (Rouse_) Багель
// mailto:rouse79@yandex.ru
//
//

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ComCtrls, Winsock, ImgList, ShellAPI;

const
STR_START = 'Начать сканирование';
STR_STOP = 'Остановить сканирование';
STR_STARTED = ' Идет сканирование ...';
STR_STOPPED = ' Сканирование завершено ...';
STR_END = ' Завершение потока ...';
STR_FIELD = ' Поле не выбрано ...';

type
TDemoThread = class(TThread)
private
TreeNetWrk: TTreeNode;
TreeDomain: TTreeNode;
TreeServer: TTreeNode;
TreeShares: TTreeNode;
Param_dwType: Byte;
Param_dwDisplayType: Byte;
Param_lpRemoteName: String;
Param_lpIP: String;
protected
procedure Execute; override;
procedure Scan(Res: TNetResource; Root: boolean);
procedure AddElement;
procedure Stop;
end;

TForm1 = class(TForm)
Button1: TButton;
TreeView1: TTreeView;
StatusBar1: TStatusBar;
ImageList1: TImageList;
procedure Button1Click(Sender: TObject);
procedure TreeView1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure TreeView1DblClick(Sender: TObject);
private
Thread: TDemoThread;
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

function GetIPAddress(NetworkName: String): String;
var
Error: DWORD;
HostEntry: PHostEnt;
Data: WSAData;
Address: In_Addr;
begin
Delete(NetworkName, 1, 2);
Error:=WSAStartup(MakeWord(1, 1), Data);
if Error = 0 then
begin
HostEntry:=gethostbyname(PChar(NetworkName));
Error:=GetLastError;
if Error = 0 then
begin
Address:=PInAddr(HostEntry^.h_addr_list^)^;
Result:=inet_ntoa(Address);
end
else
Result:='Unknown';
end
else
Result:='Error';
WSACleanup;
end;

{ TDemoThread }

procedure TDemoThread.Execute;
var
R:TNetResource;
begin
inherited;
Priority := tpIdle;
FreeOnTerminate := True;
Resume;
Scan(R, True);
TreeDomain := nil;
TreeServer := nil;
Synchronize(Stop);
end;

procedure TDemoThread.Scan(Res: TNetResource; Root: boolean);
var
hEnum: Cardinal;
nrResource: array[0..512] of TNetResource;
dwSize: DWORD;
numEntries: DWORD;
I: DWORD;
dwResult: DWORD;
begin
if Root then
dwResult := WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_ANY,
0, nil, hEnum)
else
dwResult := WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_ANY,
0, @Res, hEnum);
if dwResult = NO_ERROR then
begin
dwSize := SizeOf(nrResource);
numEntries := DWORD(-1); // ERROR_NO_MORE_ITEMS
if WNetEnumResource(hEnum, numEntries, @nrResource, dwSize) = NO_ERROR then
begin
for i := 0 to numEntries - 1 do
begin
if Terminated then Break;
with nrResource[i] do
begin
Param_dwType := dwType;
Param_dwDisplayType := dwDisplayType;
Param_lpRemoteName := lpRemoteName;
if Param_dwDisplayType = RESOURCEDISPLAYTYPE_SERVER then
Param_lpIP := GetIPAddress(Param_lpRemoteName);
end;
if Assigned(nrResource[i].lpRemoteName) then
Synchronize(AddElement);
Scan(nrResource[i], false);
end;
WNetCloseEnum(hEnum);
end;
end;
end;

procedure TDemoThread.AddElement;
begin
Application.ProcessMessages;
case Param_dwDisplayType of
RESOURCEDISPLAYTYPE_NETWORK:
begin
TreeNetWrk := Form1.TreeView1.Items.Add(nil, Param_lpRemoteName);
TreeNetWrk.StateIndex := 1;
end;
RESOURCEDISPLAYTYPE_DOMAIN:
begin
TreeDomain := Form1.TreeView1.Items.AddChild(TreeNetWrk, Param_lpRemoteName);
TreeDomain.StateIndex := 2;
end;
RESOURCEDISPLAYTYPE_SERVER:
begin
TreeServer := Form1.TreeView1.Items.AddChild(TreeDomain, Param_lpRemoteName + ' IP: ' + Param_lpIP);
TreeServer.StateIndex := 3;
end;
RESOURCEDISPLAYTYPE_SHARE:
begin
TreeShares := Form1.TreeView1.Items.AddChild(TreeServer, Param_lpRemoteName);
TreeShares.StateIndex := 3 + Param_dwType;
end;
end;
end;

procedure TDemoThread.Stop;
begin
Form1.StatusBar1.Panels[1].Text := STR_STOPPED;
Form1.Button1.Caption := STR_START;
Form1.Button1.Enabled := True;
Form1.Tag := 0;
end;

{ TForm1 }

procedure TForm1.FormCreate(Sender: TObject);
begin
Tag := 0;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
Tag := Tag + 1;
if (Tag mod 2) = 1 then
begin
TreeView1.Items.Clear;
StatusBar1.Panels[1].Text := STR_STARTED;
Button1.Caption := STR_STOP;
Thread := TDemoThread.Create(False);
end
else
begin
StatusBar1.Panels[1].Text := STR_END;
Button1.Enabled := False;
Thread.Terminate;
end;
end;

procedure TForm1.TreeView1Click(Sender: TObject);
begin
if Assigned(TreeView1.Selected) then
StatusBar1.Panels[0].Text := ' ' + TreeView1.Selected.Text
else
StatusBar1.Panels[0].Text := STR_FIELD;
end;

procedure TForm1.TreeView1DblClick(Sender: TObject);
var
Str: String;
begin
if Assigned(TreeView1.Selected) then
begin
Str := TreeView1.Selected.Text;
if Copy(Str, 1, 2) <> '\\' then Exit;
if Pos(' IP:', Str) <> 0 then
ShellExecute(Handle, 'explore', PChar(Copy(Str, 1, Pos(' IP:', Str))), nil, nil, SW_SHOW)
else
ShellExecute(Handle, 'explore', PChar(Str), nil, nil, SW_SHOW);
end;
end;

end.