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 + ;

const WM_CAP_DRIVER_CONNECT = WM_CAP_START + ;

const WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + ;

const WM_CAP_SAVEDIB = WM_CAP_START + ;

const WM_CAP_GRAB_FRAME = WM_CAP_START + ;

const WM_CAP_SEQUENCE = WM_CAP_START + ;

const WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + ;

const WM_CAP_SEQUENCE_NOFILE =WM_CAP_START+

const WM_CAP_SET_OVERLAY =WM_CAP_START+

const WM_CAP_SET_PREVIEW =WM_CAP_START+

const WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +;

const WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START +;

const WM_CAP_SET_CALLBACK_STATUSA= WM_CAP_START +;

const WM_CAP_SET_CALLBACK_FRAME= WM_CAP_START +;

const WM_CAP_SET_SCALE=WM_CAP_START+

const WM_CAP_SET_PREVIEWRATE=WM_CAP_START+  

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,);

hWndC := capCreateCaptureWindowA('My Own Capture Window',WS_CHILD or WS_VISIBLE ,Panel1.Left,Panel1.Top,Panel1.Width,Panel1.Height,Form1.Handle,);

if hWndC <>  then

begin

SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, , );

SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, , );

SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, , );

SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, , );

SendMessage(hWndC, WM_CAP_SET_SCALE, , );

SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, , );

SendMessage(hWndC, WM_CAP_SET_OVERLAY, , );

SendMessage(hWndC, WM_CAP_SET_PREVIEW, , );

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" 停止" 。代码如下：

if hWndC <>  then begin

SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, , );

hWndC := ;

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"保存BMP"、"开始录像"、"停止录像"，三个按钮的代码分别如下：

//保存BMP

if hWndC <>  then begin

SendMessage(hWndC,WM_CAP_SAVEDIB,,longint(pchar('c:/test.bmp')));

end;

// 开始录像

if hWndC <>  then

begin

SendMessage(hWndC,WM_CAP_FILE_SET_CAPTURE_FILEA,, Longint(pchar('c:/test.avi')));

SendMessage(hWndC, WM_CAP_SEQUENCE, , );

end;

//停止录像

if hWndC <>  then begin

SendMessage(hWndC, WM_CAP_STOP, , );

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：

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 + ;

const WM_CAP_DRIVER_CONNECT = WM_CAP_START + ;

const WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + ;

const WM_CAP_SAVEDIB = WM_CAP_START + ;

const WM_CAP_GRAB_FRAME = WM_CAP_START + ;

const WM_CAP_SEQUENCE = WM_CAP_START + ;

const WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + ;

const WM_CAP_SEQUENCE_NOFILE =WM_CAP_START+

const WM_CAP_SET_OVERLAY =WM_CAP_START+

const WM_CAP_SET_PREVIEW =WM_CAP_START+

const WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +;

const WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START +;

const WM_CAP_SET_CALLBACK_STATUSA= WM_CAP_START +;

const WM_CAP_SET_CALLBACK_FRAME= WM_CAP_START +;

const WM_CAP_SET_SCALE=WM_CAP_START+

const WM_CAP_SET_PREVIEWRATE=WM_CAP_START+  

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,);

hWndC := capCreateCaptureWindowA('My Own Capture Window',WS_CHILD or WS_VISIBLE ,Panel1.Left,Panel1.Top,Panel1.Width,Panel1.Height,Form1.Handle,);

if hWndC <>  then

begin

SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, , );

SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, , );

SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, , );

SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, , );

SendMessage(hWndC, WM_CAP_SET_SCALE, , );

SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, , );

SendMessage(hWndC, WM_CAP_SET_OVERLAY, , );

SendMessage(hWndC, WM_CAP_SET_PREVIEW, , );

end;

end;

procedure TForm1.Button2Click(Sender: TObject);

begin

if hWndC <>  then begin

SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, , );

hWndC := ;

end;

end;

procedure TForm1.Button3Click(Sender: TObject);

begin

if hWndC <>  then begin

SendMessage(hWndC,WM_CAP_SAVEDIB,,longint(pchar('c:/test.bmp')));

end;

end;

procedure TForm1.Button4Click(Sender: TObject);

begin

if hWndC <>  then

begin

SendMessage(hWndC,WM_CAP_FILE_SET_CAPTURE_FILEA,, Longint(pchar('c:/test.avi')));

SendMessage(hWndC, WM_CAP_SEQUENCE, , );

end;

end;

procedure TForm1.Button5Click(Sender: TObject);

begin

if hWndC <>  then begin

SendMessage(hWndC, WM_CAP_STOP, , );

end;

end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);

begin

if hWndC <>  then begin

SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, , );

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？

　　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 ，支持系统Win9X, ME, 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，无非是把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。