using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

using System.Runtime.InteropServices;
using System.Drawing.Imaging;

namespace CameraDemo
{
    /// <summary>
    /// 申明委托
    /// </summary>
    /// <param name="e"></param>
    /// <returns></returns>
    public delegate void EventPhotographedHandler(EventPhotographed e);
    public partial class Camera : UserControl
    {
        private int hHwnd;
        public string fileName = "*";//照片的文件名，一般为考生的流水号
        public int width = 310*4;//照片的尺寸为宽度：240，高度：320，即：240*320
        public int height = 275*4;
        private bool isOpen = false;
        ///   <summary>   
        ///   必需的设计器变量。   
        ///   </summary>   
        [DllImport("avicap32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern int capCreateCaptureWindowA([MarshalAs(UnmanagedType.VBByRefStr)]   ref   string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID);
        [DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern bool DestroyWindow(int hndw);
        [DllImport("user32", EntryPoint = "SendMessageA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern int SendMessage(int hwnd, int wMsg, int wParam, [MarshalAs(UnmanagedType.AsAny)]   object lParam);
        [DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern int SetWindowPos(int hwnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);

        public Camera()
        {
            InitializeComponent();
            if (fileName == "*")
            {
                fileName = DateTime.Now.ToString("yyMMddHHmmssfff");
            }
            Clipboard.Clear();         
        }
        /// <summary>
        /// 拍照事件
        /// </summary>
        public event EventPhotographedHandler EventPhotographeded;

        int OpenCount = 0;
        private void OpenCapture()
        {
            string msg="未找到可用摄像头，请检查设备是否正常后重试！";
            try
            {
                int intWidth = this.videoWindow.Width;
                int intHeight = this.videoWindow.Height;
                int intDevice = 0;
                string refDevice = intDevice.ToString();
                hHwnd = Camera.capCreateCaptureWindowA(ref   refDevice, 1342177280, 0, 0, 640, 480, this.videoWindow.Handle.ToInt32(), 0);
                int cameraCount = Camera.SendMessage(this.hHwnd, 0x40a, intDevice, 0);
                if (cameraCount > 0)
                {
                    try
                    {
                        Camera.SendMessage(this.hHwnd, 0x435, -1, 0);
                        Camera.SendMessage(this.hHwnd, 0x434, 0x42, 0);
                        Camera.SendMessage(this.hHwnd, 0x432, -1, 0);
                        Camera.SetWindowPos(this.hHwnd, 1, 0, 0, intWidth, intHeight, 6);
                        isOpen = true;
                    }
                    catch { LYFZ.MessageBoxCustom.Show(msg); return; }
                    
                }
                else
                {
                    Camera.DestroyWindow(this.hHwnd);
                }

                if (!isOpen)
                {
                    System.Threading.Thread.Sleep(10);
                    OpenCount++;
                    if (OpenCount < 30)
                    {
                        OpenCapture();
                    }
                    else {
                        LYFZ.MessageBoxCustom.Show(msg); return;
                    }
                    
                }
            }
            catch {
                LYFZ.MessageBoxCustom.Show(msg); return;
            }
        }
        /// <summary>
        /// 打开摄像头
        /// </summary>
        /// <returns></returns>
        public bool OpenCamera()
        {
            if (!isOpen)
            this.OpenCapture();
            return isOpen;
        }
        private void btn_OpenCapture_Click(object sender, EventArgs e)//打开摄像头，显示视频
        {
            if (!isOpen)
            this.OpenCapture();
        }
        bool isSaveImageFile = true;
        /// <summary>
        /// 是否直接保存Image文件
        /// </summary>
        public bool IsSaveImageFile
        {
            get { return isSaveImageFile; }
            set { isSaveImageFile = value; }
        }

        
        private void btn_GetCapture_Click(object sender, EventArgs e)//抓取图像
        {
            try
            {

                Camera.SendMessage(this.hHwnd, 0x41e, 0, 0);
                IDataObject obj_camera = Clipboard.GetDataObject();
                if (obj_camera.GetDataPresent(typeof(Bitmap)))
                {
                    Image image_camera = ((Image)obj_camera.GetData(typeof(Bitmap))).GetThumbnailImage(width, height, null, IntPtr.Zero);
                    //设置图片的尺寸为240*320
                    if (IsSaveImageFile)
                    {
                        SaveFileDialog SaveFileDialog_camera = new SaveFileDialog();
                        SaveFileDialog_camera.FileName = fileName + ".jpg";
                        SaveFileDialog_camera.Filter = "Image Files(*.JPG)|*.JPG";
                        if (SaveFileDialog_camera.ShowDialog() == DialogResult.OK)
                        {
                            image_camera.Save(SaveFileDialog_camera.FileName, ImageFormat.Jpeg);
                        }
                    }
                    else {
                        EventPhotographed eventPhtoto = new EventPhotographed(image_camera);
                        eventPhtoto.IsPhotographedSuccess = true;
                        this.EventPhotographeded(eventPhtoto);
                        
                    }              
                }
                else
                {
                    MessageBox.Show("摄像头没有开启，不能抓图，请开启摄像头！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
            catch
            {
                MessageBox.Show("抓取图像时出现错误！", "错误信息", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void btn_CloseCapture_Click(object sender, EventArgs e)//关闭摄像头
        {
            Camera.SendMessage(this.hHwnd, 0x40b, 0, 0);
            Camera.DestroyWindow(this.hHwnd);

            Clipboard.Clear();//清除剪切板中的内容
            isOpen = false;
        }
        private void btn_set_Click(object sender, EventArgs e)//对摄像头进行设置
        {
            if (isOpen)
                Camera.SendMessage(this.hHwnd, 0x42a, 0, 0);
            else
                MessageBox.Show("摄像头没有开启，不能设置，请开启摄像头！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }

        private void btn_kinescope_Click(object sender, EventArgs e)//开始录像，录像过程中鼠标成漏斗形，对着图像显示区域单击鼠标左键或右键就结束了录像。
        {
            if (isOpen)
            {
                SaveFileDialog SaveFileDialog_Video = new SaveFileDialog();
                SaveFileDialog_Video.FileName = fileName + ".avi";
                SaveFileDialog_Video.Filter = "Video Files(*.avi)|*.avi";
                if (SaveFileDialog_Video.ShowDialog() == DialogResult.OK)
                {
                    SendMessage(this.hHwnd, 0x414, 0, SaveFileDialog_Video.FileName);
                    SendMessage(this.hHwnd, 0x43e, 0, 0);
                }
            }
            else
                MessageBox.Show("摄像头没有开启，不能录像，请开启摄像头！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }

        private void btn_stopKinescope_Click(object sender, EventArgs e)//停止录像
        {
            SendMessage(this.hHwnd, 0x444, 0, 0); 
        }
    }
    /// <summary>
    /// 拍照事件对象
    /// </summary>
    public class EventPhotographed : EventArgs
    {
        private Image _image;
        /// <summary>
        /// 输出图像
        /// </summary>
        public Image OutputImage
        {
            get { return _image; }
            set { _image = value; }
        }
        public EventPhotographed(Image image)
        {
            this._image = image;
        }

        bool isPhotographedSuccess = false;
        /// <summary>
        /// 是否拍照成功
        /// </summary>
        public bool IsPhotographedSuccess
        {
            get { return isPhotographedSuccess; }
            set { isPhotographedSuccess = value; }
        }
    }
}