[ecfisa]

Hola look.

De este modo te va a compilar:

Código Delphi [-]
unit Webcam;

interface

uses
  Windows, Messages;

const
  WM_Connect     = WM_USER + 10;
  WM_Disconnect  = WM_USER + 11;
  WM_GrabFrame   = WM_USER + 60;
  WM_SaveDIB     = WM_USER + 25;
  WM_Preview     = WM_USER + 50;
  WM_PreviewRate = WM_USER + 52;
  WM_Configure   = WM_USER + 41;

type
  TWebcam = class
    constructor Create(
      const WindowName: String = '';
      ParentWnd: Hwnd = 0;
      Left: Integer = 0;
      Top: Integer = 0;
      Width: Integer = 0;
      height: Integer = 0;
      Style: Cardinal = WS_CHILD or WS_VISIBLE;
      WebcamID: Integer = 0);
    public
      procedure Connect;
      procedure Disconnect;
      procedure GrabFrame;
      procedure SaveDIB(const FileName: String = 'webcam.bmp');
      // procedure Preview(&on: Boolean = True);  (Delphi 7 no permite la declaracion: &on)
      procedure Preview(IsOn: Boolean = True);
      procedure PreviewRate(Rate: Integer = 42);
      procedure Configure;
    private
      CaptureWnd: HWnd;
  end;
...

Saludos.