不懂什么是twin接口，给你网上的代码：
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls, Buttons;
type
TForm1 = class(TForm)
Panel1: TPanel;
Panel2: TPanel;
Button1: TButton;
Button2: TButton;
Button3: TButton;
Button4: TButton;
Button5: TButton;
Button6: TButton;
Timer1: TTimer;
BitBtn1: TBitBtn;
BitBtn2: TBitBtn;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
procedure Button5Click(Sender: TObject);
procedure Panel1Resize(Sender: TObject);
procedure Button6Click(Sender: TObject);
procedure Panel1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure Timer1Timer(Sender: TObject);
procedure BitBtn1Click(Sender: TObject);
procedure BitBtn2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
hWndC: THandle;
const
WM_CAP_START = WM_USER;
WM_CAP_STOP = WM_CAP_START + 68;
WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;
WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;
WM_CAP_SAVEDIB = WM_CAP_START + 25;
WM_CAP_GRAB_FRAME = WM_CAP_START + 60;
WM_CAP_SEQUENCE = WM_CAP_START + 62;
WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;
WM_CAP_SEQUENCE_NOFILE =WM_CAP_START+ 63;
WM_CAP_SET_OVERLAY =WM_CAP_START+ 51;
WM_CAP_SET_PREVIEW =WM_CAP_START+ 50;
WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +6;
WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START +2;
WM_CAP_SET_CALLBACK_STATUSA= WM_CAP_START +3;
WM_CAP_SET_CALLBACK_FRAME= WM_CAP_START +5;
WM_CAP_SET_SCALE=WM_CAP_START+ 53;
WM_CAP_SET_PREVIEWRATE=WM_CAP_START+ 52;
implementation
{$R *.dfm}
function capCreateCaptureWindowA(lpszWindowName : PCHAR; dwStyle : longint; x : integer;
y : integer;nWidth : integer;nHeight : integer;ParentWin : HWND;
nId : integer): HWND;STDCALL EXTERNAL 'AVICAP32.DLL';
procedure TForm1.Button1Click(Sender: TObject);
begin
hWndC := capCreateCaptureWindowA('My Own Capture Window',WS_CHILD or WS_VISIBLE ,Panel1.Left,Panel1.Top,Panel1.Width,Panel1.Height,Form1.Handle,0);
if hWndC <> 0 then
begin
SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);
SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
if hWndC <> 0 then begin
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
hWndC := 0;
end;
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
if hWndC <> 0 then begin
SendMessage(hWndC,WM_CAP_SAVEDIB,0,longint(pchar('test'+inttostr(random(100))+inttostr(random(100))+'.bmp')));
end;
end;
procedure TForm1.Button4Click(Sender: TObject);
var
path:String;
begin
path:=ExtractFilePath(paramstr(0));
if hWndC <> 0 then
begin
SendMessage(hWndC,WM_CAP_FILE_SET_CAPTURE_FILEA,0, Longint(pchar(path+'test.avi')));
SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
end;
end;
procedure TForm1.Button5Click(Sender: TObject);
begin
if hWndC <> 0 then begin
SendMessage(hWndC, WM_CAP_STOP, 0, 0);
end;
end;
procedure TForm1.Panel1Resize(Sender: TObject);
begin
Button2Click(nil);
Button1Click(nil)
end;
procedure TForm1.Button6Click(Sender: TObject);
begin
panel2.Hide;
form1.BorderStyle:=bsnone;
form1.WindowState:=wsmaximized;
end;
procedure TForm1.Panel1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
if button=mbright then
close;
end;
procedure TForm1.Timer1Timer(Sender: TObject);
begin
Button3Click(nil)
end;
procedure TForm1.BitBtn1Click(Sender: TObject);
begin
timer1.Enabled:=true;
end;
procedure TForm1.BitBtn2Click(Sender: TObject);
begin
timer1.Enabled:=false;
end;
end.
剩下的我就不知道了别问我
