//==============================================================
//  版权所有：深圳杰文科技
//  文件名：Camera.cs
//  版本：V1.0  
//  创建者：Jay  ( QQ： 85363208 )
//  创建时间：2017-11-28 16:18
//  创建描述：
//  修改者：
//  修改时间：
//  修改说明： 
//==============================================================

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;

namespace Infrastructure.Utilities
{
	//摄像头截屏。
	public class Camera
	{
		//打开摄像头，截图并保存到指定路径。
		public static void Save(Control control, string path)
		{
			Camera video = new Camera(control.Handle, 0, 0, control.ClientSize.Width, control.ClientSize.Height);
			video.Stop();
			video.Start();
			video.GrabImage(path);
			video.Stop();
		}

		[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);

		[DllImport("avicap32.dll")]
		public static extern bool capGetDriverDescriptionA(short wDriver, byte[] lpszName, int cbName, byte[] lpszVer, int cbVer);

		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 Camera(IntPtr handle, int left, int top, int width, int height)
		{
			mControlPtr = handle;
			mWidth = width;
			mHeight = height;
			mLeft = left;
			mTop = top;
		}

		/// <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);
		}

	}
}
