c# 调用摄像头（C#摄像头）

本文实例讲述了C#实现控制摄像头的类。分享给大家供大家参考。具体如下：

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112 /// <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;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")]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, long lParam);/// <summary>/// 开始显示图像/// </summary>public void Start(){if (bStat)return;bStat = true;byte[] lpszName = new byte[100];hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);if (hWndC.ToInt32() != 0){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, 66, 0);SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);}return;}/// <summary>/// 停止显示/// </summary>public void Stop(){SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);bStat = false;}/// <summary>/// 抓图/// </summary>/// <param name="path">要保存bmp文件的路径</param>public void GrabImage(string path){IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64());}/// <summary>/// 录像/// </summary>/// <param name="path">要保存avi文件的路径</param>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);}/// <summary>/// 停止录像/// </summary>public void StopKinescope(){SendMessage(hWndC, WM_CAP_STOP, 0, 0);}}