作者：未知 来源：月光软件站 加入时间：2005-2-28　月光软件站

这段时间搞视频采集方面的程序，在国外网站上找到一个用C#写的驱动摄像头的程序。

经改造和调试，如下：

安装摄像头后，一般可以找到一个avicap32.dll文件

这是一个关于设想头的类

using System;
using System.Runtime.InteropServices;

namespace webcam
{
?///

//Web Camera Class
?public class WebCamera
?{
??// Constructur
??public WebCamera(IntPtr handle, int width,int height)
??{
???mControlPtr = handle;
???mWidth = width;
???mHeight = height;
??}
????
??// delegate for frame callback
??public delegate void RecievedFrameEventHandler(byte[] data);
??public event RecievedFrameEventHandler RecievedFrame;
????
??private IntPtr lwndC; // Holds the unmanaged handle of the control
??private IntPtr mControlPtr; // Holds the managed pointer of the control
??private int mWidth;
??private int mHeight;
????
??private showVideo.FrameEventHandler mFrameEventHandler; // Delegate instance for the frame callback - must keep alive! gc should NOT collect it
????
??// Close the web camera
??public void CloseWebcam()
??{
???this.capDriverDisconnect(this.lwndC);
??}
????
??// start the web camera
??public void StartWebCam()
??{
???byte[] lpszName = new byte[100];
???byte[] lpszVer = new byte[100];
?????????
???showVideo.capGetDriverDescriptionA(0, lpszName, 100,lpszVer, 100);
???this.lwndC = showVideo.capCreateCaptureWindowA(lpszName, showVideo.WS_VISIBLE + showVideo.WS_CHILD, 0, 0, mWidth, mHeight, mControlPtr, 0);
?????????
???if (this.capDriverConnect(this.lwndC, 0))
???{
????this.capPreviewRate(this.lwndC, 66);
????this.capPreview(this.lwndC, true);
????showVideo.BITMAPINFO bitmapinfo = new showVideo.BITMAPINFO();
????bitmapinfo.bmiHeader.biSize = showVideo.SizeOf(bitmapinfo.bmiHeader);
????bitmapinfo.bmiHeader.biWidth = 352;
????bitmapinfo.bmiHeader.biHeight = 288;
????bitmapinfo.bmiHeader.biPlanes = 1;
????bitmapinfo.bmiHeader.biBitCount = 24;
????this.capSetVideoFormat(this.lwndC, ref bitmapinfo, showVideo.SizeOf(bitmapinfo));
????this.mFrameEventHandler = new showVideo.FrameEventHandler(FrameCallBack);
????this.capSetCallbackOnFrame(this.lwndC, this.mFrameEventHandler);
????showVideo.SetWindowPos(this.lwndC, 0, 0, 0, mWidth , mHeight , 6);
???}
??}
?
??// private functions
??private bool capDriverConnect(IntPtr lwnd, short i)
??{
???return showVideo.SendMessage(lwnd, showVideo.WM_CAP_DRIVER_CONNECT, i, 0);
??}
?
??private bool capDriverDisconnect(IntPtr lwnd)
??{
???return showVideo.SendMessage(lwnd, showVideo.WM_CAP_DRIVER_DISCONNECT, 0, 0);
??}
????
??private bool capPreview(IntPtr lwnd, bool f)
??{
???return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_PREVIEW , f, 0);
??}
?
??private bool capPreviewRate(IntPtr lwnd, short wMS)
??{
???return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_PREVIEWRATE, wMS, 0);
??}
????
??private bool capSetCallbackOnFrame(IntPtr lwnd, showVideo.FrameEventHandler lpProc)
??{????
???return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_CALLBACK_FRAME, 0, lpProc);
??}
?
??private bool capSetVideoFormat(IntPtr hCapWnd, ref showVideo.BITMAPINFO BmpFormat, int CapFormatSize)
??{
???return showVideo.SendMessage(hCapWnd, showVideo.WM_CAP_SET_VIDEOFORMAT, CapFormatSize, ref BmpFormat);
??}
?
??private void FrameCallBack(IntPtr lwnd, IntPtr lpVHdr)
??{
???showVideo.VIDEOHDR videoHeader = new showVideo.VIDEOHDR();
???byte[] VideoData;
???videoHeader = (showVideo.VIDEOHDR)showVideo.GetStructure(lpVHdr,videoHeader);
???VideoData = new byte[videoHeader.dwBytesUsed];
???showVideo.Copy(videoHeader.lpData ,VideoData);
???if (this.RecievedFrame != null)
????this.RecievedFrame (VideoData);
??}
?}

}

具体调用如下：

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using webcam;

namespace webcam
{
?///

??public Form1()
??{
???//
???// Windows 窗体设计器支持所必需的
???//
???InitializeComponent();

???//
???// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
???//
??}

??///

??#region Windows 窗体设计器生成的代码
??///

??}
??#endregion

??///

??private void Form1_Load(object sender, System.EventArgs e)
??{
???b_play.Enabled = false;
???b_stop.Enabled = true;
???panelPreview.Size = new Size(330,330);
???wc = new WebCamera( panelPreview.Handle,panelPreview.Width,panelPreview.Height);
???wc.StartWebCam();
??}

??private void button1_Click(object sender, System.EventArgs e)
??{
???b_play.Enabled = false;
???b_stop.Enabled = true;
???panelPreview.Size = new Size(330,330);
???wc = new WebCamera( panelPreview.Handle,panelPreview.Width,panelPreview.Height);
???wc.StartWebCam();
??}

??private void b_stop_Click(object sender, System.EventArgs e)
??{
???b_play.Enabled = true;
???b_stop.Enabled = false;
???wc.CloseWebcam();
??}
?}
}

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