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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

const
  WM_CAP_DRIVER_CONNECT = WM_USER + 10;
  WM_CAP_DRIVER_DISCONNECT = WM_USER +  11;
  WM_CAP_EDIT_COPY = WM_USER + 30;
  WM_CAP_DLG_VIDEOSOURCE = WM_USER + 42;
  WM_CAP_SET_PREVIEW = WM_USER + 50;
  WM_CAP_SET_OVERLAY = WM_USER + 51;
  WM_CAP_SET_PREVIEWRATE = WM_USER + 52;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;
  vhandle: THandle;

implementation

{$R *.dfm}

function capCreateCaptureWindow(lpszWindowName: LPCSTR;
  dwStyle: DWORD;
  x, y,
  nWidth,
  nHeight: integer;
  hwndParent: HWND;
  nID: integer): HWND; stdcall;
  external 'AVICAP32.DLL' name 'capCreateCaptureWindowA';

procedure TForm1.Button1Click(Sender: TObject);
begin
  if vhandle <= 0 then begin
    vhandle := capCreateCaptureWindow('Video',ws_child+ws_visible, 8, 8, 180, 240, Form1.Handle, 1);
  end;
  SendMessage(vhandle, WM_CAP_DRIVER_CONNECT, 0, 0);
  SendMessage(vhandle, WM_CAP_SET_PREVIEWRATE, 30, 0);
  SendMessage(vhandle, WM_CAP_SET_OVERLAY, 1, 0);
  SendMessage(vhandle, WM_CAP_SET_PREVIEW, 1, 0);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  SendMessage(vhandle, WM_CAP_SET_PREVIEW, 0, 0);
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  SendMessage(vhandle, WM_CAP_DRIVER_DISCONNECT, 0, 0);
end;

end.