unit SearchGroupThreadUnit;

interface

uses Windows, Messages, SysUtils, Classes,ComCtrls,Dialogs;
type
  TSearchGroupThread=class(TThread)
  private
    MyHost      : string;
    TemNode     : TTreeNode;  //TemNode is the temp node
  public
    MyGroup     : string;
    MyTree      : TTreeView;
    MyNode      : TTreeNode;
    Terminated  : boolean;
  protected
    procedure Execute; override;
    Procedure AddHost;
    procedure notfind;
    procedure GroupProgress;
  end;

  
implementation
uses main,SearchHostThreadUnit;

procedure TSearchGroupThread.AddHost;
var
  MyItemPtr     : PMyTreeItem;
begin

  with MainForm do
  begin
    //listbox1.Items.Add(myhost);
    //listbox1.TopIndex := listbox1.Items.Count -1;
    Statusbar.Panels[1].Text := '正在搜索:'+MyHost;

    New(MyItemPtr);
    MyItemPtr^.DirName :=MyHost;
    MyItemPtr^.Group :=MyGroup;
    TemNode:=MyTree.Items.AddChild(MyNode,myhost);  //MyNode is group
    TemNode.Data := MyItemPtr;                      // TemNode is host
    MyNode.ImageIndex :=9;
    MyNode.SelectedIndex :=9;
    TemNode.ImageIndex := 12;
    TemNode.SelectedIndex :=9;
    MyNode.expand(false);

  end;
  
end;

procedure TSearchGroupThread.notfind;
begin

     MyNode.ImageIndex :=14;
     MyNode.SelectedIndex :=14;
 
end;

procedure TSearchGroupThread.GroupProgress;
begin
 with MainForm do
 begin
   inc(FinishNum);
   statusbar.Panels[3].Text :='共'+inttostr(groupnum)+
    '個(gè)工作組,已搜索了'+inttostr(FinishNum)+'個(gè)';
 end;
end;

procedure TSearchGroupThread.Execute;
Var
  EnumHandle                : THandle;
  WorkgroupRS               : TNetResource;
  Buf                       : Array[1..500] of TNetResource;
  BufSize                   : DWord;
  Entries                   : DWord;
  Result                    : Integer;
  
  searcher                  : TSearchHostThread;
  EverFound                 : boolean;
begin
  Terminated:=false;
  if stop then exit;
  if terminated then exit;
  EverFound:=false;
  MyGroup := MyGroup + #0;
  FillChar(WorkgroupRS, SizeOf(WorkgroupRS) , 0);
  With WorkgroupRS do begin
    dwScope := 2;
    dwType := 3;
    dwDisplayType := 1;
    dwUsage := 2;
    lpRemoteName := @MyGroup[1];
  end;
  Result:=WNetOpenEnum( RESOURCE_GLOBALNET,
                RESOURCETYPE_ANY,
                0,
                @WorkgroupRS,
                EnumHandle );
  if Result= NO_ERROR then
  Repeat
    Entries := 1;
    BufSize := SizeOf(Buf);
   Result := WNetEnumResource( EnumHandle,Entries,@Buf,BufSize );
   If (Result = NO_ERROR) and (Entries = 1) then begin
      myhost:= StrPas(Buf[1].lpRemoteName);
      Synchronize(AddHost);
      everFound:=true;
      //dir
      if stop then exit;
      if terminated then exit;
      searcher:=TSearchHostThread.create(true);
      searcher.MyTree := MyTree;
      searcher.MyNode := TemNode;
      searcher.MyHost := MyHost;
      searcher.MyGroup := MyGroup;
      searcher.FreeOnTerminate := true;
      searcher.Resume;
      searcher.WaitFor;
      //dir
    end;
  //if stop then exit;
  if terminated then exit;
  Until (Entries <> 1) or (Result <> NO_ERROR);
  WNetCloseEnum( EnumHandle );
  if (not everFound) then  Synchronize(NotFind);
  Synchronize(GroupProgress);
  //if ver>4 then if terminated then exit;
  Terminated:=true;
end;

end.