Ersatz für Sleep?

[PeterPanino]

Hallo und schönen Abend!

Ich verwende diesen Code, um den Windows CHM-Viewer in mein Programm einzubetten und eine CHM-Datei darin anzuzeigen:

Formular-Definition:

Delphi-Quellcode:

object Form1: TForm1
  Left = 1838
  Top = 468
  Caption = 'Form1'
  ClientHeight = 681
  ClientWidth = 656
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  Position = poScreenCenter
  DesignSize = (
    656
    681)
  PixelsPerInch = 96
  TextHeight = 13
  object Button1: TButton
    Left = 24
    Top = 24
    Width = 177
    Height = 25
    Caption = 'Embed Viewer App'
    TabOrder = 0
    OnClick = Button1Click
  end
  object Panel1: TPanel
    Left = 8
    Top = 64
    Width = 640
    Height = 609
    Anchors = [akLeft, akTop, akRight, akBottom]
    TabOrder = 1
    OnResize = Panel1Resize
    ExplicitWidth = 448
    ExplicitHeight = 321
  end
  object Button2: TButton
    Left = 216
    Top = 24
    Width = 177
    Height = 25
    Caption = 'Release Viewer App'
    TabOrder = 2
    OnClick = Button2Click
  end
end

Form-Unit:

Delphi-Quellcode:

unit MainForm;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes,
  Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.ExtCtrls, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Panel1: TPanel;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Panel1Resize(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
    FAppWnd: DWORD;
    procedure PADoEmbeddApp(APanel: TPanel; const AAppToExec, AParam: string);
    procedure PADoReleaseEmbeddedApp;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses
  Winapi.ShellAPI;

procedure TForm1.PADoEmbeddApp(APanel: TPanel; const AAppToExec, AParam: string);
// App starten und einbetten
// uses Winapi.ShellAPI;
var
  ExecuteFile: string;
  SEInfo: TShellExecuteInfo;
  RetryCount: Integer;
begin
  FillChar(SEInfo, SizeOf(SEInfo), 0);
  SEInfo.cbSize := SizeOf(TShellExecuteInfo);
  with SEInfo do
  begin
    fMask := SEE_MASK_NOCLOSEPROCESS;
    Wnd := APanel.Handle;
    lpFile := PChar(AAppToExec);
    lpParameters := PChar(AParam);
    nShow := SW_HIDE;
  end;

  if ShellExecuteEx(@SEInfo) then // wenn Programm erfolgreich gestartet wurde
  begin
    RetryCount := 0;
    repeat
      FAppWnd := FindWindow(PChar('HH Parent'), nil);
      Sleep(100);
      Inc(RetryCount);
    until (FAppWnd <> 0) or (RetryCount > 10);

    if FAppWnd <> 0 then // wenn das Fenster der ViewerApp gefunden wurde
    begin
      Winapi.Windows.SetParent(FAppWnd, SEInfo.Wnd);
      SetWindowLong(FAppWnd, GWL_STYLE, GetWindowLong(Handle, GWL_STYLE)
        and not WS_BORDER
        and not WS_THICKFRAME
        and not WS_DLGFRAME
        );

      SetWindowPos(FAppWnd, 0, 0, 0, APanel.Width, APanel.Height, SWP_ASYNCWINDOWPOS);

      Sleep(1000); // das Gelbe vom Ei?

      APanel.Repaint;
      Application.ProcessMessages;

      ShowWindow(FAppWnd, SW_SHOWMAXIMIZED);
    end;
  end;
end;

procedure TForm1.PADoReleaseEmbeddedApp;
// Eingebettetes Programm beenden
begin
  if FAppWnd <> 0 then
  begin
    PostMessage(FAppWnd, WM_Close, 0, 0);
    FAppWnd := 0;
  end;
end;

procedure TForm1.Panel1Resize(Sender: TObject);
// Größe von Embedded App zusammen mit Fenster verändern
begin
  if IsWindow(FAppWnd) then
    SetWindowPos(FAppWnd, 0, 0, 0, Panel1.Width, Panel1.Height, SWP_ASYNCWINDOWPOS);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  PADoEmbeddApp(Panel1, 'hh.exe', 'R:\Example.chm');
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  PADoReleaseEmbeddedApp;
end;

end.

Das funktioniert auch sehr gut. Nur stört mich das Sleep(1000); nach SetWindowPos. Oder auch das Sleep(100); in der repeat-Schleife davor. Gibt es dafür keine elegantere Lösung?