一个网站完整详细的seo优化方案,做电影下载网站还赚钱吗,西安网站建设查派,国家反诈中心app下载安卓版C#摄像头实现拍照功能的简单代码示例2009-11-20 来自#xff1a;网上整理字体大小#xff1a;【大中小】摘要#xff1a;这里将介绍一个C#摄像头实现拍照功能的简单代码示例#xff0c;代码虽然不短#xff0c;但是基本上实现了相对应的功能#xff0c;希望对大家有所帮… C#摄像头实现拍照功能的简单代码示例2009-11-20 来自网上整理字体大小【大中小】·摘要这里将介绍一个C#摄像头实现拍照功能的简单代码示例代码虽然不短但是基本上实现了相对应的功能希望对大家有所帮助。· C#摄像头实现拍照功能的简单代码示例1.using System; 2.using System.Runtime.InteropServices; 3.using System.Drawing; 4.using System.Drawing.Imaging; 5.namespace Video 6.{ 7./// 8./// 一个C#摄像头控制类 9./// 10.publicclass VideoWork 11.{ 12.privateconstint WM_USER 0x400; 13.privateconstint WS_CHILD 0x40000000; 14.privateconstint WS_VISIBLE 0x10000000; 15.privateconstint WM_CAP_START WM_USER; 16.privateconstint WM_CAP_STOP WM_CAP_START 68; 17.privateconstint WM_CAP_DRIVER_CONNECT WM_CAP_START 10; 18.privateconstint WM_CAP_DRIVER_DISCONNECT WM_CAP_START 11; 19.privateconstint WM_CAP_SAVEDIB WM_CAP_START 25; 20.privateconstint WM_CAP_GRAB_FRAME WM_CAP_START 60; 21.privateconstint WM_CAP_SEQUENCE WM_CAP_START 62; 22.privateconstint WM_CAP_FILE_SET_CAPTURE_FILEA WM_CAP_START 20; 23.privateconstint WM_CAP_SEQUENCE_NOFILE WM_CAP_START 63; 24.privateconstint WM_CAP_SET_OVERLAY WM_CAP_START 51; 25.privateconstint WM_CAP_SET_PREVIEW WM_CAP_START 50; 26.privateconstint WM_CAP_SET_CALLBACK_VIDEOSTREAM WM_CAP_START 6; 27.privateconstint WM_CAP_SET_CALLBACK_ERRORWM_CAP_START 2; 28.privateconstint WM_CAP_SET_CALLBACK_STATUSA WM_CAP_START 3; 29.privateconstint WM_CAP_SET_CALLBACK_FRAME WM_CAP_START 5; 30.privateconstint WM_CAP_SET_SCALEWM_CAP_START 53; 31.privateconstint WM_CAP_SET_PREVIEWRATEWM_CAP_START 52; 32.private IntPtr hWndC; 33.privatebool bWorkStart false; 34.private IntPtr mControlPtr; 35.privateint mWidth; 36.privateint mHeight; 37.privateint mLeft; 38.privateint mTop; 39.40./// 41./// 初始化显示图像 42./// 43./// 控件的句柄 44./// 开始显示的左边距 45./// 开始显示的上边距 46./// 要显示的宽度 47./// 要显示的长度 48.public VideoWork(IntPtr handle, int left, int top, int width,int height) 49.{ 50.mControlPtr handle; 51.mWidth width; 52.mHeight height; 53.mLeft left; 54.mTop top; 55.} 56.[DllImport(avicap32.dll)] 57.privatestaticextern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID); 58.[DllImport(avicap32.dll)] 59.privatestaticexternint capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize ); 60.[DllImport(User32.dll)] 61.privatestaticexternbool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam); 62./// 63./// 开始显示图像 64./// 65.publicvoid Start() 66.{ 67.if (bWorkStart) 68.return; 69.bWorkStart true; 70.byte[] lpszName newbyte[100]; 71.hWndC capCreateCaptureWindowA(lpszName,WS_CHILD|WS_VISIBLE ,mLeft,mTop,mWidth,mHeight,mControlPtr,0); 72.if (hWndC.ToInt32() ! 0) 73.{ 74.SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0); 75.SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0); 76.SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0); 77.SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0); 78.SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0); 79.SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0); 80.SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0); 81.SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0); 82.//Global.log.Write(SendMessage); 83.} 84.return; 85.} 86./// 87./// 停止显示 88./// 89.publicvoid Stop() 90.{ 91.SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0); 92.bWorkStart false; 93.} 94./// 95./// 抓图 96./// 97./// 要保存bmp文件的路径 98.publicvoid GrabImage(string path) 99.{ 100.IntPtr hBmp Marshal.StringToHGlobalAnsi(path); 101.SendMessage(hWndC,WM_CAP_SAVEDIB,0,hBmp.ToInt64()); 102.} 103.} 104.} 105.106.//这是一个控制摄像头进行拍照的类我每次使用GrabImage抓图都是225K的一张照片我想请问如何才能让我107.//抓到的图片小一些我想控制在70K左右。不知怎么让拍照的像素变小108.109.if(this.Request.QueryString[filename]!null) 110.{ 111.//获取原图片 112.string filenamethis.Request.QueryString[filename]; 113.Bitmap bmpOldnew Bitmap(this.Server.MapPath(p_w_picpaths/ filename)); 114.//计算缩小比例 115.double d1; 116.if(bmpOld.HeightbmpOld.Width) 117.d1(double)(MaxLength/(double)bmpOld.Width); 118.else119.d1(double)(MaxLength/(double)bmpOld.Height); 120.//产生缩图 121.Bitmap bmpThumbnew Bitmap(bmpOld,(int)(bmpOld.Width*d1),(int)(bmpOld.Height*d1)); 122.//清除缓冲 123.Response.Clear(); 124.//生成图片 125.bmpThumb.Save(this.Response.OutputStream,ImageFormat.Jpeg); 126.Response.End(); 127.//释放资源 128.bmpThumb.Dispose(); 129.bmpOld.Dispose(); 130.} C#摄像头实现拍照功能的简单代码示例就介绍到这里。 转载于:https://blog.51cto.com/3446502/1228106
