利用Delphi编程控制摄像头

unit Unit1;

interface

uses

Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

Dialogs, StdCtrls, ExtCtrls;

type

TForm1 = class(TForm)

Panel1: TPanel;

Button1: TButton;

Button2: TButton;

Button3: TButton;

Button4: TButton;

Button5: TButton;

procedure Button1Click(Sender: TObject);

procedure Button2Click(Sender: TObject);

procedure Button3Click(Sender: TObject);

procedure Button4Click(Sender: TObject);

procedure Button5Click(Sender: TObject);

procedure FormClose(Sender: TObject; var Action: TCloseAction);

private

hWndC : THandle;

public

{ Public declarations }

end;

var

Form1: TForm1;

const WM_CAP_START = WM_USER;

const WM_CAP_STOP = WM_CAP_START + 68;

const WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;

const WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;

const WM_CAP_SAVEDIB = WM_CAP_START + 25;

const WM_CAP_GRAB_FRAME = WM_CAP_START + 60;

const WM_CAP_SEQUENCE = WM_CAP_START + 62;

const WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;

const WM_CAP_SEQUENCE_NOFILE =WM_CAP_START+ 63

const WM_CAP_SET_OVERLAY =WM_CAP_START+ 51

const WM_CAP_SET_PREVIEW =WM_CAP_START+ 50

const WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +6;

const WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START +2;

const WM_CAP_SET_CALLBACK_STATUSA= WM_CAP_START +3;

const WM_CAP_SET_CALLBACK_FRAME= WM_CAP_START +5;

const WM_CAP_SET_SCALE=WM_CAP_START+ 53

const WM_CAP_SET_PREVIEWRATE=WM_CAP_START+ 52

function capCreateCaptureWindowA(lpszWindowName : PCHAR;

dwStyle : longint;x : integer;y : integer;nWidth : integer;

nHeight : integer;ParentWin : HWND;nId : integer): HWND;

STDCALL EXTERNAL 'AVICAP32.DLL';

implementation

{$R *.dfm}

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);

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('c:\test.bmp')));

end;

end;

procedure TForm1.Button4Click(Sender: TObject);

begin

if hWndC <> 0 then

begin

SendMessage(hWndC,WM_CAP_FILE_SET_CAPTURE_FILEA,0, 
Longint(pchar('c:\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.FormClose(Sender: TObject; var Action: TCloseAction);

begin

if hWndC <> 0 then begin

SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);

end;

end;

end.