在delphi中 如何实现 USB摄像头捕获视频显示？

Question

delphi中USB摄像头捕获视频显示程序  思路 或是有源码可以参考最好 不胜感激~~

Answer 1

unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls,Directshow9;type
  TForm1 = class(TForm)
    Button1: TButton;
    Panel1: TPanel;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    Button7: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Panel1Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
  private
    { Private declarations }
    hWndC : THandle; //定义捕捉窗句柄
  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;
const WM_CAP_DLG_VIDEOFORMAT  =WM_CAP_START+ 41;
const WM_CAP_DLG_VIDEOSOURCE  =WM_CAP_START+ 42; //1066 打开属性设置对话框，设置对比度、亮度等。
const WM_CAP_DLG_VIDEODISPLAY = WM_CAP_START + 43;
//const WM_CAP_SET_SCALE        =WM_CAP_START+ 53; //设置刻度    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}
//uses Directshow9;function devwdm_SetVideoStandard(nID:longlong;VideoStandard:LONGLONG):LONGLONG;stdcall;external 'devwdm.dll';
function devwdm_InitCard(nID:longlong;handle:THandle;nWidth:integer;nHeight:integer):LONGLONG;stdcall;external 'devwdm.dll';
function devwdm_StartVideoPreview(nID:longlong):LONGLONG;stdcall;external 'devwdm.dll';procedure TForm1.Button1Click(Sender: TObject);
begin
    //使用Tpanel控件来创建捕捉窗口
hWndC:=CapCreateCaptureWindowA ('My Own Capture Window',WS_CHILD or WS_VISIBLE, //窗口样式
Panel1.Left,//X坐标
Panel1.Top,//Y坐标
panel1.Width, //窗口宽
panel1.Height, //窗口高
Form1.Handle, //窗口句柄
0); //一般为0
if hWndC <> 0 then
beginSendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
//捕捉一个视频流
SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0); //得到一个设备错误
SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0); //得到一个设备状态
SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
//将一个捕捉窗口与一个设备驱动相关联
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); //将捕捉窗同驱动器断开
hWndC := 0;
end;
//close;
end;procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
if hWndC <> 0 then
begin
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0); //将捕捉窗同驱动器断开
end;
end;procedure TForm1.Button3Click(Sender: TObject);
begin
if hWndC <> 0 then
begin
SendMessage(hWndC,WM_CAP_FILE_SET_CAPTURE_FILEA,0,Longint(pchar('d:\test.avi')));// 录成AVI
SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
end;
end;procedure TForm1.Button4Click(Sender: TObject);
begin
if hWndC <> 0 then
begin
SendMessage(hWndC, WM_CAP_STOP, 0, 0);
end;
end;procedure TForm1.Button5Click(Sender: TObject);
begin
if hWndC <> 0 then
begin
SendMessage(hWndC,WM_CAP_SAVEDIB,0,longint(pchar('D:\test.bmp')));//截图
end;
end;procedure TForm1.Panel1Click(Sender: TObject);
begin
panel1.Height:=Panel1.Height+10;
Panel1.Width:=Panel1.Width+10;
end;procedure TForm1.Button6Click(Sender: TObject);
//var CaptureParms :CAPTUREPARMS ;
begin
SendMessage(hWndC, WM_CAP_DLG_VIDEOSOURCE, 0, 0);
end;procedure TForm1.Button7Click(Sender: TObject);
begin
SendMessage(hWndC, WM_CAP_DLG_VIDEOFORMAT, 0, 0);
end;end.

Answer 2

谢谢大家 三楼的jianaixhb能麻烦你给把源码给我发邮箱里吗？我没有找到资源下载 

Answer 3

可以用directx库写，也可以用opencv库，还可以用做好的控件dspack,控件可以到www.2ccc.com下载，里面有demo，很容易就可以看懂