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：

beginhWndC := 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 beginSendMessage(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"停止"代码如下：if hWndC <> 0 then beginSendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);hWndC := 0;end;