.Net里一个用于驱动摄像头的类

本文是借助avicap32.dll库来驱动摄像头。做到了抓图、录像功能。

　　using System;　　using System.Runtime.InteropServices;　　using System.Drawing;　　using System.Drawing.Imaging;

　　namespace using System;　　using System.Runtime.InteropServices;　　using System.Drawing;　　using System.Drawing.Imaging;

　　namespace PickHead　　{　　/// <summary>　　/// 一个控制摄像头的类　　/// </summary>　　public class Pick　　{　　private const int WM_USER = 0x400;　　private const int WS_CHILD = 0x40000000;　　private const int WS_VISIBLE = 0x10000000;　　private const int WM_CAP_START = WM_USER;　　private const int WM_CAP_STOP = WM_CAP_START + 68;　　private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;　　private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;　　private const int WM_CAP_SAVEDIB = WM_CAP_START + 25;　　private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;　　private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;　　private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;　　private const int WM_CAP_SEQUENCE_NOFILE =WM_CAP_START+ 63;　　private const int WM_CAP_SET_OVERLAY =WM_CAP_START+ 51; 　　private const int WM_CAP_SET_PREVIEW =WM_CAP_START+ 50; 　　private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +6;　　private const int WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START +2;　　private const int WM_CAP_SET_CALLBACK_STATUSA= WM_CAP_START +3;　　private const int WM_CAP_SET_CALLBACK_FRAME= WM_CAP_START +5;　　private const int WM_CAP_SET_SCALE=WM_CAP_START+ 53;　　private const int WM_CAP_SET_PREVIEWRATE=WM_CAP_START+ 52; 　　private IntPtr hWndC;　　private bool bStat = false;　　　　private IntPtr mControlPtr;　　private int mWidth;　　private int mHeight;　　private int mLeft;　　private int mTop;　　　　/// <summary>　　/// 初始化摄像头　　/// </summary>　　/// <param name="handle">控件的句柄</param>　　/// <param name="left">开始显示的左边距</param>　　/// <param name="top">开始显示的上边距</param>　　/// <param name="width">要显示的宽度</param>　　/// <param name="height">要显示的长度</param>　　public Pick(IntPtr handle, int left, int top, int width,int height)　　{　　mControlPtr = handle;　　mWidth = width;　　mHeight = height;