用usb摄相头如何及时显示所摄图象?

Question

用usb摄相头如何及时显示所摄图象，目的是用此摄相头作照象用

Answer 1

ImgScan控件是C:\WINNT\system32\imgscan.ocx(win2000),(98中也有)导入得参考
  if imgscan.scanneravailable then
  try
    ImgScan.FileType := 3;//BMP格式
    imgscan.image := 'C:\1.BMP';
    ImgScan.PageOption := 0;
    imgscan.startscan;
    ImgScan.ScanTo := 2;
  except
    MessageDlg('您的外部设备没有打开，无法进行本次操作！' + chr(13) +
      '请退出本管理系统，待扫描仪打开后再进入，即可使用！', mtInformation,
        [mbOk],
      0);
    Abort;
  end;

Answer 2

我用如此方法得到一帧一帧的相片，请高指点如何将图像动态地显示在我控制的窗体内，实现方法如下
unit mainfrm;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, OleCtrls, ScanLibCtl_TLB;type
  TForm1 = class(TForm)
    Panel1: TPanel;
    OpenVideo: TButton;
    CloseVideo: TButton;
    GrabFrame: TButton;
    SaveBMP: TButton;
    StartAVI: TButton;
    StopAVI: TButton;
    SaveDialog1: TSaveDialog;
    Button1: TButton;
    ImgScan: TImgScan;
    procedure FormCreate(Sender: TObject);
    procedure OpenVideoClick(Sender: TObject);
    procedure CloseVideoClick(Sender: TObject);
    procedure GrabFrameClick(Sender: TObject);
    procedure SaveBMPClick(Sender: TObject);
    procedure StartAVIClick(Sender: TObject);
    procedure StopAVIClick(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
    hWndC : THandle; 
    CapturingAVI : bool;
  public
    { Public declarations }
  end;var
  Form1: TForm1;implementation{$R *.dfm}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;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.FormCreate(Sender: TObject);
begin
 CapturingAVI := false; 
 hWndC := 0;
 SaveDialog1.Options :=[ofHideReadOnly, ofNoChangeDir, ofPathMustExist]
end;procedure TForm1.OpenVideoClick(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
SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
end;procedure TForm1.CloseVideoClick(Sender: TObject);
begin
if hWndC <> 0 then begin
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
hWndC := 0;
end;
end;procedure TForm1.GrabFrameClick(Sender: TObject);
begin
if hWndC <> 0 then
SendMessage(hWndC, WM_CAP_GRAB_FRAME, 0, 0); 
end;procedure TForm1.SaveBMPClick(Sender: TObject);
begin
if hWndC <> 0 then begin
SaveDialog1.DefaultExt := 'bmp'; 
SaveDialog1.Filter := 'Bitmap files (*.bmp)|*.bmp'; 
if SaveDialog1.Execute then 
SendMessage(hWndC,
WM_CAP_SAVEDIB,
0,
longint(pchar(SaveDialog1.FileName)));
end;
end;procedure TForm1.StartAVIClick(Sender: TObject);
begin
if hWndC <> 0 then begin 
SaveDialog1.DefaultExt := 'avi'; 
SaveDialog1.Filter := 'AVI files (*.avi)|*.avi'; 
if SaveDialog1.Execute then begin
CapturingAVI := true; 
SendMessage(hWndC, 
WM_CAP_FILE_SET_CAPTURE_FILEA, 
0, 
Longint(pchar(SaveDialog1.FileName))); 
SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0); 
end; 
end;
end;procedure TForm1.StopAVIClick(Sender: TObject);
begin
if hWndC <> 0 then begin 
SendMessage(hWndC, WM_CAP_STOP, 0, 0); 
CapturingAVI := false; 
end;
end;

Answer 3

留下Email发给你一个Demo程序---------
^^!

Answer 4

http://expert.csdn.net/Expert/topic/2340/2340132.xml?temp=.3537104

Answer 5

cdsoftwarewj: 您好！
  ),我在此多谢你啦。

Answer 6

http://218.56.11.178:8020/web/index.aspx-》软件基地 -》源码-》delphi/kylix->视频技术相关源码