控制usb摄像头照相 ( 积分: 50 )

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zhlfdm

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控制usb摄像头照相,图像不用太大.但要速度快.
 
在回调函数里每帧的数据都是一幅图
 
具体怎么实现
 
那要看多快了。
 
我用网上说的AVICAP32.DLL来作,结果程序运行起来有一点卡....
 
我用
你的电脑有没有摄像头?看到别人用QQ玩视屏你会不会去想怎么实现的?
这里介绍使用DELPHI使用MS的AVICAP32.DLL就可轻松的实现对摄像头编程,
如果再加上你的网络编程水平,实现一个视屏聊天就不成什么问题了。
看看下面代码的代码:

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‘;

上面的代码就是我们主要用到的一个函数和常量的定义。

好了,打开你的Delphi,新建一个工程,将上面的定义加上吧。

新建一个窗口,放个Panel上去,添加一个按钮,Caption设置为"开始"
这里需要定义一个全局变量,var hWndC : THandle;

开始按钮代码如下:

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;

按F9运行一下,怎么样,是不是可以看到摄像头的视屏了?

那怎么停下来?再加个按钮caption设置成&quot;停止&quot;
代码如下:
if hWndC <> 0 then
begin

SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
hWndC := 0;
end;


视屏截到了,怎么把它给保存下来呢?

下面按两种方式保存,一个是BMP静态图,一个是AVI动画。

再放三个按钮到窗体上去,caption分别设置成&quot;保存BMP&quot;、&quot;开始录像&quot;、&quot;停止录像&quot;
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);
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.


如果电脑没有摄像头,但又想看看程序的效果,可以么?
呵呵,当然可以,找个虚拟摄像头不就搞定,大家可以试试SoftCam这个软件,它是一个名副其实的软件摄像机,
能模拟成为“真实的”摄像机,提醒一下各位,大家可不要用这个东东用在QQ,MSN等聊天软件上欺骗MM或GG啊。

关于摄像头编程,大家也可以看看这组VCL组件:DSPack,DSPack是一套使用微软Direct Show和DirectX技术的类和组件,设计工作于DirectX 9,支持系统Win9X, ME, 2000和Windows XP。
好了,就介绍这些了,至于视屏聊天怎么实现,就看你的了,无非是按数据压缩传输给对方,显示出来,不过话又说回来,看似简单,实现起来还有些难度的。
 
是抓图的时候卡,还是录像的时候?
 
如果你不用direct show,就应该先把图片存入内存而不是立刻显示它。
 
拍照下来的图像的大小在哪里定义呢?如我要拍:800*600等格式尺寸。能具体说一下吗?
 
是录像的时候卡.chen
 
http://www.ysza.com/download/HsjCamera.exe
迷你摄像机 用摄像头拍摄大头贴的软件。对摄像头捕捉到的视频,进行录像、捕捉单幅图片。录像支持mpeg4格式压缩(无需每次设置压缩格式),支持录像为gif格式。支持录制正在播放的声音、麦克风。支持捕捉区域选择,支持像框。使用本软件,您可以拍出的可爱照片制作个人相册,给朋友做贺卡,可以制作动画,记录小宝宝的成长足迹,发给您的亲人网友
 
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