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Delphi编程控制摄像头(3)

2008-04-09 04:21:59来源：互联网阅读 ()

"
三个按钮的代码分别如下：

//保存BMP
if hWndC <> 0 then begin
SendMessage(hWndC,WM_CAP_SAVEDIB,0,longint(pchar(‘c:\\test.bmp‘)));
end;

//开始录像
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;

//停止录像
if hWndC <> 0 then begin
SendMessage(hWndC, WM_CAP_STOP, 0, 0);
end;

再运行看看吧。。可以保存几张图看看，也可以录成AVI以后慢慢欣赏。

程序运行效果： [ 相关贴图 ]
http://yousoft.hi.com.cn/upload/forum/2004715161959.jpg

完整的程序代码如下：

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);

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