How make the same hole in two Form's on remote screen (client side), based on area dr

[flashcoder]

How make the same hole in two Form's on remote screen (client side), based on area drawn on server side?

I have the following code and want draw the same hole in two Form's on remote screen (client side), based on area drawn on server side.

I have the same Form (Form3) in both sides (server and client) that is a "mirror" where i'm drawing a area that must stays inside this same Form on client side.

PS: The Form3 in server side have 50% of max AlphaBlend value, this is necessary to see remote screen behind Form3.

Before all, i want say that i'm receiving the remote screen on server side and and mouse click positions works like expected.

The thouble:

https://i.stack.imgur.com/wvxJE.png

The following code produce the result showed on image above. I think that this code is right but is missing align this hole with the Form3. When i draw the area on server side, is created a hole on client side exactly like expected (hole that show Mozilla Firefox icon, see image above). But the other hole of Form3 appear wrong

Someone could help with this?

This is all relevant code:

SERVER SIDE:

Form2 (where i see the remote screen):

Delphi-Quellcode:

unit Unit2;

interface

uses
 Unit1;

type
  TForm2 = class(TForm)
  Panel1: TPanel;
  CheckBox1: TCheckBox;
  ScrollBox1: TScrollBox;
  Image1: TImage;
  PaintBox1: TPaintBox;
  procedure PaintBox1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
  procedure PaintBox1MouseMove(Sender: TObject; Shift: TShiftState;
      X, Y: Integer);
  procedure PaintBox1MouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
  procedure PaintBox1Paint(Sender: TObject);

  private
    { Private declarations }
    FSelecting: Boolean;
    FSelection: TRect;
    pos1, pos2, pos3, pos4: Integer;
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

procedure TForm2.PaintBox1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin

  if CheckBox1.Checked then
  begin
    FSelection.Left := X;
    FSelection.Top := Y;
    FSelecting := true;
  end;

end;

procedure TForm2.PaintBox1MouseMove(Sender: TObject; Shift: TShiftState;
  X, Y: Integer);
begin

  if FSelecting then
  begin
    FSelection.Right := X;
    FSelection.Bottom := Y;
    pbRec.Invalidate;
  end;

end;

procedure TForm2.PaintBox1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin

  if CheckBox1.Checked then
  begin
    FSelecting := false;
    FSelection.Right := X;
    FSelection.Bottom := Y;
    PaintBox1.Invalidate;

    FSelection.NormalizeRect;
    if FSelection.IsEmpty then
    begin
      // None selection was made on PaintBox
    end
    else
    begin
      pos1 := FSelection.Left;
      pos2 := FSelection.Top;
      pos3 := X;
      pos4 := Y;
    end;
  end;

end;

procedure TForm2.PaintBox1Paint(Sender: TObject);
begin
  if CheckBox1.Checked then
  begin
    PaintBox1.Canvas.Brush.Style := bsClear;
    PaintBox1.Canvas.Pen.Style := psSolid;
    PaintBox1.Canvas.Pen.Color := clRed;
    PaintBox1.Canvas.Rectangle(FSelection);
  end;
end;

procedure TForm2.Button1Click(Sender: TObject);
var
  Socket: TCustomWinSocket;
begin
  Socket := TCustomWinSocket(Form1.LV1.Selected.SubItems.Objects[0]);
  if CheckBox1.Checked then
  begin
      Socket.SendText(intToStr(pos1) + ';' + intToStr(pos2) + ';' +
        intToStr(pos3) + ';' + intToStr(pos4));
  end;
end;

procedure TForm2.Button2Click(Sender: TObject);
begin
  Form3 := TForm3.Create(Self);
  Form3.Show;
end;

Form2 .DFM:

Delphi-Quellcode:

object Panel1: TPanel
    Left = -1
    Top = 0
    Width = 773
    Height = 89
    Anchors = [akTop]
    BevelEdges = [beLeft, beRight]
    ParentDoubleBuffered = False
    TabOrder = 0
    end

object ScrollBox1: TScrollBox
    Left = 0
    Top = 0
    Width = 765
    Height = 472
    HorzScrollBar.Smooth = True
    HorzScrollBar.Tracking = True
    VertScrollBar.Smooth = True
    VertScrollBar.Tracking = True
    Align = alClient
    TabOrder = 1
    object Image1: TImage
      Left = 0
      Top = 0
      Width = 1362
      Height = 621
      AutoSize = True
    end

object PaintBox1: TPaintBox
      Left = 0
      Top = 0
      Width = 1362
      Height = 621
      Align = alClient
      OnMouseDown = PaintBox1MouseDown
      OnMouseMove = PaintBox1MouseMove
      OnMouseUp = PaintBox1MouseUp
      OnPaint = PaintBox1Paint
      ExplicitWidth = 1364
      ExplicitHeight = 622
    end

Form3 (the "mirror" Form that also is the same on client side), this Form is centralized according of remote screen resolution:

Delphi-Quellcode:

unit Unit3;

interface

uses
 ...

type
  TForm3 = class(TForm)
    Panel1: TPanel;
    Image1: TImage;
    Label1: TLabel;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
    procedure CreateParams(var pr: TCreateParams); override;
  public
    { Public declarations }
  end;

var
  Form3: TForm3;

implementation

uses 
 Unit1;

{$R *.dfm}

procedure TForm3.FormCreate(Sender: TObject);
var
  MyString: String;
  Splitted: TArray<String>;
begin
  MyString := Form1.LV1.Selected.SubItems[6]; // Resolution of remote screen
  Splitted := MyString.Split(['x']);

  Self.Left := (Integer(Splitted[0]) - Self.Width) div 2;
  Self.Top := (Integer(Splitted[1]) - Self.Height) div 2;
end;

procedure TForm3.CreateParams(var pr: TCreateParams);
begin
  inherited;
  pr.WndParent := Form2.Handle;
  pr.ExStyle := pr.ExStyle or WS_EX_TOPMOST or WS_EX_TRANSPARENT;
  pr.ExStyle := WS_EX_TRANSPARENT or WS_EX_TOPMOST;
end;

Form3 .DFM:

Delphi-Quellcode:

object Form3: TForm3
  Left = 328
  Top = 143
  BorderStyle = bsNone
  ClientHeight = 567
  ClientWidth = 526
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  Position = poScreenCenter
  OnCreate = FormCreate
  PixelsPerInch = 96
  TextHeight = 13
  object Panel1: TPanel
    Left = 0
    Top = 0
    Width = 801
    Height = 569
    TabOrder = 0
    object Image1: TImage
      Left = 1
      Top = 1
      Width = 799
      Height = 567
      Align = alClient
      ExplicitLeft = 2
      ExplicitTop = 0
      ExplicitHeight = 447
    end

    object Label1: TLabel
      Left = 92
      Top = 69
      Width = 28
      Height = 13
      Caption = 'Nome'
      Color = clBtnFace
      Font.Charset = DEFAULT_CHARSET
      Font.Color = clBlack
      Font.Height = -11
      Font.Name = 'MS Sans Serif'
      Font.Style = []
      ParentColor = False
      ParentFont = False
    end

CLIENT SIDE:

Form2 ("locker" Form):

Delphi-Quellcode:

unit Unit2;

private
    { Private declarations }
    procedure CreateParams(var Params: TCreateParams); override;

  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

procedure TForm2.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  Params.WndParent := Application.Handle;
  Params.ExStyle := Params.ExStyle or WS_EX_TOPMOST or WS_EX_TRANSPARENT;
  Params.ExStyle := WS_EX_TRANSPARENT or WS_EX_TOPMOST;
end;

procedure TForm2.FormCreate(Sender: TObject);
begin
  windowstate := wsmaximized;
  Top := 0;
  Left := 0;
  Height := Screen.Height;
  Width := Screen.Width;
end;

{

Properties of Form2:

Align => alNone
AlphaBlend => True
BorderStyle => BsNone

}

end.

Form3 (the same of server side):

Delphi-Quellcode:

unit Unit3;

interface

uses
 ...

type
  TForm3 = class(TForm)
    Panel1: TPanel;
    Label1: TLabel;
    procedure FormShow(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
    procedure CreateParams(var pr: TCreateParams); override;
  public
    { Public declarations }
  end;

var
  Form3: TForm3;

implementation

uses 
 Unit2;

{$R *.dfm}

procedure TForm3.FormCreate(Sender: TObject);
begin
  Self.Left := (GetSystemMetrics(SM_CXSCREEN) - Self.Width) div 2;
  Self.Top := (GetSystemMetrics(SM_CYSCREEN) - Self.Height) div 2;
end;

procedure TForm3.FormShow(Sender: TObject);
begin
  ShowWindow(Application.Handle, SW_HIDE);
end;

procedure TForm3.CreateParams(var pr: TCreateParams);
begin
  inherited;
  pr.WndParent := Form2.Handle;
end;

{

Properties of Form3:

Align => alNone
BorderStyle => BsNone

}

end.

Receiving the area on client side:

Delphi-Quellcode:

procedure CS1_Read(Self: Pointer; Sender: TObject; Socket: TCustomWinSocket);
var
 X1, X2, Y1, Y2: Integer;
 List: TStrings;
 FormRegion, HoleRegion: HRGN;
 StrCommand: string;

begin

if Pos(';', StrCommand) > 0 then
begin

    List := TStringList.Create;
    try

      ExtractStrings([';'], [], PChar(StrCommand), List);

      Form3 := TForm3.Create(Form2); // The Form2 already was created and is showing

      X1 := Round(StrToIntDef(List[0], 0) - Form2.Left);
      Y1 := Round(StrToIntDef(List[1], 0) - Form2.Top);
      X2 := Round(StrToIntDef(List[2], 0) - Form2.Left);
      Y2 := Round(StrToIntDef(List[3], 0) - Form2.Top);


      FormRegion := CreateRectRgn(0, 0, Form3.Width, Form3.Height);
      HoleRegion := CreateRectRgn(X1, Y1, X2, Y2);
      CombineRgn(FormRegion, FormRegion, HoleRegion, RGN_DIFF);
      SetWindowRgn(Form3.handle, FormRegion, true);

      FormRegion := CreateRectRgn(0, 0, Form2.Width, Form2.Height);
      HoleRegion := CreateRectRgn(X1, Y1, X2, Y2);
      CombineRgn(FormRegion, FormRegion, HoleRegion, RGN_DIFF);
      SetWindowRgn(Form2.handle, FormRegion, true);

      Form3.ShowModal;
      Form3.Release;

    finally
      List.Free;
    end;
  end;
end;

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[victorlus]

Does anyone have the solution?