1、前段时间刚做了个监控系统,有不明白+qq 51076008using System.Runtime.InteropServices;using System.Drawing;using System.Drawing.Imaging;using System;namespace CamTest2/ / 一个控制摄像头的类/ public class Pickprivate const int WM_USER = 0x400;private const int WS_CHILD = 0x40000000;private const int WS_VISIBLE = 0x10000000;priva
2、te 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 =
3、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_
4、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_
5、SET_SCALE = WM_CAP_START + 53;private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52;private const int WM_CAP_DLG_VIDEOFORMAT = WM_CAP_START + 41;private const int WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + 42;private const int WM_CAP_DLG_VIDEODISPLAY = WM_CAP_START + 43;private const int WM_CAP_
6、DLG_VIDEOCOMPRESSION = WM_CAP_START + 46;private IntPtr hWndC;private bool bStat = false;private IntPtr mControlPtr;private int mWidth;private int mHeight;private int mLeft;private int mTop;/ / 初始化摄像头/ / 控件的句柄/ 开始显示的左边距/ 开始显示的上边距/ 要显示的宽度/ 要显示的长度public Pick(IntPtr handle, int left, int top, int width
7、, int height)mControlPtr = handle;mWidth = width;mHeight = height;mLeft = left;mTop = top;DllImport(“avicap32.dll“)private static extern IntPtr capCreateCaptureWindowA(byte lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);DllImport(“avicap32.dll“)privat
8、e static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);DllImport(“User32.dll“)private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam);public void capDlgVideoFormat()Boolean capDlgVideoFormat = SendMessage(hWndC, WM_CAP_DLG_VIDEOFORMAT, 0, 0
9、);public void capDlgVideoSource()Boolean capDlgVideoSource = SendMessage(hWndC, WM_CAP_DLG_VIDEOSOURCE, 0, 0);public void capDlgVideoDisplay()Boolean capDlgVideoDisplay = SendMessage(hWndC, WM_CAP_DLG_VIDEODISPLAY, 0, 0);public void capDlgVideoCompression()Boolean capDlgVideoCompression = SendMessag
10、e(hWndC, WM_CAP_DLG_VIDEOCOMPRESSION, 0, 0);/ / 开始显示图像/ public void Start()if (bStat)return;bStat = true;byte lpszName = new byte100;hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);if (hWndC.ToInt32() != 0)SendMessage(hWndC, WM_CAP_SET_C
11、ALLBACK_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_
12、SET_OVERLAY, 1, 0);SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);return;/ / 停止显示/ public void Stop()SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);bStat = false;/ / 抓图/ / 要保存 bmp文件的路径public void GrabImage(string path)IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);SendMessage(hWndC, WM_CAP_SAVEDI
13、B, 0, hBmp.ToInt64();/ / 录像/ / 要保存 avi文件的路径public void Kinescope(string path)IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt64();SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);/ / 停止录像/ public void StopKinescope()SendMessage(hWndC, WM_CAP_ST
14、OP, 0, 0);/* public void cap()CAPTUREPARMS s;capCaptureGetSetup(m_caphwnd,/取得采集参数s.dwRequestMicroSecPerFrame = 33333;/采集一帧花费 1/30秒s.fAbortLeftMouse = FALSE;/压下鼠标左键不终止采集s.fAbortRightMouse = FALSE;/压下鼠标右键不终止采集s.fCaptureAudio = TRUE;/c采集音频s.fYield = TRUE;/使用一个独立的线程来采集视频,不使用 View窗口线程capCaptureSetSetup(m_caphwnd,/设定采集参数*/