摄像头的使用

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.