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using System; using System.Collections.Generic; using System.Linq; using System.Runtime.InteropServices; using System.Text; namespace Video { public class VideoControl { //导入API函数 [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")] private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize); [DllImport("User32.dll")] private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam); //常量设置 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 const int WM_CAP_FILE_SAVEAS = WM_CAP_START + 23; //将捕捉文件保存为另一个用户指定的文件。这个消息不会改变捕捉文件的名字和内容, //全局变量 private IntPtr hWndC; //句柄 private IntPtr mControlPtr; //句柄 private bool bWorkStart = false; private int mWidth; //视频显示宽度 private int mHeight; //视频显示高度 private int mLeft; //视频显示左边距 private int mTop; //视频显示上边距 /// <summary> /// 初始化显示图像 /// </summary> /// <param name="handle">播放视频控件的句柄</param> /// <param name="left">视频显示的左边距</param> /// <param name="top">视频显示的上边距</param> /// <param name="width">要显示视频的宽度</param> /// <param name="height">要显示视频的长度</param> public VideoControl(IntPtr handle, int left, int top, int width, int height) { mControlPtr = handle; mWidth = width; mHeight = height; mLeft = left; mTop = top; } /// <summary> /// 打开视频 /// </summary> public void StartVideo() { if (bWorkStart) return; bWorkStart = true; byte[] lpszName = new byte[100]; //创建播放窗口 hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0); if (hWndC.ToInt32() != 0) { //显示视频 SendMessage(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, 100, 0); SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0); SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0); } } /// <summary> /// 关闭视频 /// </summary> public void StopVideo() { SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0); bWorkStart = false; } /// <summary> /// 开始录像 /// </summary> /// <param name="path">要保存录像的路径</param> public void StarKinescope(string path) { IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt32()); SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0); } /// <summary> /// 停止录像 /// </summary> public void StopKinescope() { SendMessage(hWndC, WM_CAP_STOP, 0, 0); } /// <summary> /// 拍照 /// </summary> /// <param name="path">文件路径</param> public void Images(string path) { IntPtr imagePath = Marshal.StringToHGlobalAnsi(path); SendMessage(hWndC, WM_CAP_SAVEDIB, 0, imagePath.ToInt32()); } } }
纸上得来终觉浅,绝知此事要躬行。