c#实现摄象头视频采集，拍照，录象

Camera.cs类文件

 

using System;
using System.IO;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace DongFengHealth
{
 ///
 /// avicap 的摘要说明。
 ///
 public class showVideo
 {
  // showVideo calls
  [DllImport("avicap32.dll")] public static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
  [DllImport("avicap32.dll")] public static extern bool capGetDriverDescriptionA(short wDriver, byte[] lpszName, int cbName, byte[] lpszVer, int cbVer);
  [DllImport("User32.dll")] public static extern bool SendMessage(IntPtr hWnd, int wMsg, bool wParam, int lParam);
  [DllImport("User32.dll")] public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, int lParam);
  [DllImport("User32.dll")] public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, FrameEventHandler lParam);
  [DllImport("User32.dll")] public static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, ref BITMAPINFO lParam);
  [DllImport("User32.dll")] public static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);
  [DllImport("avicap32.dll")]public static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize );
 
  // Constants
　 　 public const int WM_USER = 0x400;
　 　 public const int WS_CHILD = 0x40000000;
　 　 public const int WS_VISIBLE = 0x10000000;
　 　 public const int WM_CAP_START = WM_USER;
　 　 public const int WM_CAP_STOP = WM_CAP_START + 68;
　 　 public const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;
　　 public const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;
　　 public const int WM_CAP_SAVEDIB = WM_CAP_START + 25;
　　 public const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;
　　 public const int WM_CAP_SEQUENCE = WM_CAP_START + 62;
　　 public const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;
　　 public const int WM_CAP_SEQUENCE_NOFILE =WM_CAP_START+ 63;
　　 public const int WM_CAP_SET_OVERLAY =WM_CAP_START+ 51;
　　 public const int WM_CAP_SET_PREVIEW =WM_CAP_START+ 50;
　　 public const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +6;
　　 public const int WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START +2;
　　 public const int WM_CAP_SET_CALLBACK_STATUSA= WM_CAP_START +3;
　　 public const int WM_CAP_SET_CALLBACK_FRAME= WM_CAP_START +5;
　　 public const int WM_CAP_SET_SCALE=WM_CAP_START+ 53;
　　 public const int WM_CAP_SET_PREVIEWRATE=WM_CAP_START+ 52;
  public const int WM_CAP_SET_VIDEOFORMAT = WM_USER + 45; 
  // Structures
  [StructLayout(LayoutKind.Sequential)] public struct VIDEOHDR
  {
   [MarshalAs(UnmanagedType.I4)] public int lpData;
   [MarshalAs(UnmanagedType.I4)] public int dwBufferLength;
   [MarshalAs(UnmanagedType.I4)] public int dwBytesUsed;
   [MarshalAs(UnmanagedType.I4)] public int dwTimeCaptured;
   [MarshalAs(UnmanagedType.I4)] public int dwUser;
   [MarshalAs(UnmanagedType.I4)] public int dwFlags;
   [MarshalAs(UnmanagedType.ByValArray, SizeConst=4)] public int[] dwReserved;
  }
 
  [StructLayout(LayoutKind.Sequential)] public struct BITMAPINFOHEADER
  {
   [MarshalAs(UnmanagedType.I4)] public Int32 biSize ;
   [MarshalAs(UnmanagedType.I4)] public Int32 biWidth ;
   [MarshalAs(UnmanagedType.I4)] public Int32 biHeight ;
   [MarshalAs(UnmanagedType.I2)] public short biPlanes;
   [MarshalAs(UnmanagedType.I2)] public short biBitCount ;
   [MarshalAs(UnmanagedType.I4)] public Int32 biCompression;
   [MarshalAs(UnmanagedType.I4)] public Int32 biSizeImage;
   [MarshalAs(UnmanagedType.I4)] public Int32 biXPelsPerMeter;
   [MarshalAs(UnmanagedType.I4)] public Int32 biYPelsPerMeter;
   [MarshalAs(UnmanagedType.I4)] public Int32 biClrUsed;
   [MarshalAs(UnmanagedType.I4)] public Int32 biClrImportant;
  }
 
  [StructLayout(LayoutKind.Sequential)] public struct BITMAPINFO
  {
   [MarshalAs(UnmanagedType.Struct, SizeConst=40)] public BITMAPINFOHEADER bmiHeader;
   [MarshalAs(UnmanagedType.ByValArray, SizeConst=1024)] public Int32[] bmiColors;
  }
    
  public delegate void FrameEventHandler(IntPtr lwnd, IntPtr lpVHdr);
    
  // Public methods
  public static object GetStructure(IntPtr ptr,ValueType structure)
  {
   return Marshal.PtrToStructure(ptr,structure.GetType());
  }
 
  public static object GetStructure(int ptr,ValueType structure)
  {
   return GetStructure(new IntPtr(ptr),structure);
  }
    
  public static void Copy(IntPtr ptr,byte[] data)
  {
   Marshal.Copy(ptr,data,0,data.Length);
  }
    
  public static void Copy(int ptr,byte[] data)
  {
   Copy(new IntPtr(ptr),data);
  }
    
  public static int SizeOf(object structure)
  {
   return Marshal.SizeOf(structure);
  }
 }

 //Web Camera Class
 public class Camera
 {
  // Constructur
  public Camera(IntPtr handle, int width,int height)
  {
   mControlPtr = handle;
   mWidth = width;
   mHeight = height;
  }
    
  // delegate for frame callback
  public delegate void RecievedFrameEventHandler(byte[] data);
  public event RecievedFrameEventHandler RecievedFrame;
    
  public  IntPtr lwndC; // Holds the unmanaged handle of the control
  private IntPtr mControlPtr; // Holds the managed pointer of the control
  private int mWidth;
  private int mHeight;
    
  private showVideo.FrameEventHandler mFrameEventHandler; // Delegate instance for the frame callback - must keep alive! gc should NOT collect it
    
  // Close the web camera
  public void CloseCamera()
  {
   this.capDriverDisconnect(this.lwndC);
  }
    
  // start the web camera
  public void StartCamera()
  {
   byte[] lpszName = new byte[100];
   byte[] lpszVer = new byte[100];
         
   showVideo.capGetDriverDescriptionA(0, lpszName, 100,lpszVer, 100);
   this.lwndC = showVideo.capCreateCaptureWindowA(lpszName, showVideo.WS_VISIBLE + showVideo.WS_CHILD, 0, 0, mWidth, mHeight, mControlPtr, 0);
         
   if (this.capDriverConnect(this.lwndC, 0))
   {
    this.capPreviewRate(this.lwndC, 66);
    this.capPreview(this.lwndC, true);
    showVideo.BITMAPINFO bitmapinfo = new showVideo.BITMAPINFO();
    bitmapinfo.bmiHeader.biSize = showVideo.SizeOf(bitmapinfo.bmiHeader);
    bitmapinfo.bmiHeader.biWidth = 352;
    bitmapinfo.bmiHeader.biHeight = 288;
    bitmapinfo.bmiHeader.biPlanes = 1;
    bitmapinfo.bmiHeader.biBitCount = 24;
    this.capSetVideoFormat(this.lwndC, ref bitmapinfo, showVideo.SizeOf(bitmapinfo));
    this.mFrameEventHandler = new showVideo.FrameEventHandler(FrameCallBack);
    this.capSetCallbackOnFrame(this.lwndC, this.mFrameEventHandler);
    showVideo.SetWindowPos(this.lwndC, 0, 0, 0, mWidth , mHeight , 6);
   }
  }
 
  public void bitMapToJPG(string bmpFileName,string jpgFileName)
  {
   System.Drawing.Image img;
   img=ReturnPhoto(bmpFileName);
   img.Save(jpgFileName,ImageFormat.Jpeg);
  }
  private Image ReturnPhoto(string bmpFileName)
  {
   System.IO.FileStream stream ;
   stream=File.OpenRead(bmpFileName);
   Bitmap bmp = new Bitmap(stream);
   System.Drawing.Image image = bmp;//得到原图

   //创建指定大小的图
   System.Drawing.Image newImage = image.GetThumbnailImage(bmp.Width, bmp.Height, null, new IntPtr());
   Graphics g=Graphics.FromImage(newImage);
   g.DrawImage(newImage,0,0, newImage.Width, newImage.Height); //将原图画到指定的图上
   g.Dispose();
   stream.Close();
   return newImage;
  }
  public void capImage(IntPtr lwnd,string path)//抓图
  {
   showVideo.BITMAPINFO bitmapinfo = new showVideo.BITMAPINFO();
   IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
   showVideo.SendMessage(lwnd,showVideo.WM_CAP_SAVEDIB,0,hBmp.ToInt32());

  }
  public void capScope(IntPtr lwnd,string path)// 录像,保存avi文件的路径
  {
   IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
   showVideo.SendMessage(lwnd,showVideo.WM_CAP_FILE_SET_CAPTURE_FILEA,0,hBmp.ToInt32());
   showVideo.SendMessage(lwnd, showVideo.WM_CAP_SEQUENCE, 0, 0);
  }
  public void stopCapScope(IntPtr lwnd)// 停止录像
  {
   showVideo.SendMessage(lwnd, showVideo.WM_CAP_STOP, 0, 0);
  }
  private bool capDriverConnect(IntPtr lwnd, short i)
  {
   return showVideo.SendMessage(lwnd, showVideo.WM_CAP_DRIVER_CONNECT, i, 0);
  }
   private bool capDriverDisconnect(IntPtr lwnd)
  {
   return showVideo.SendMessage(lwnd, showVideo.WM_CAP_DRIVER_DISCONNECT, 0, 0);
  }
    private bool capPreview(IntPtr lwnd, bool f)
  {
   return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_PREVIEW , f, 0);
  }
 
  private bool capPreviewRate(IntPtr lwnd, short wMS)
  {
   return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_PREVIEWRATE, wMS, 0);
  }
    
  private bool capSetCallbackOnFrame(IntPtr lwnd, showVideo.FrameEventHandler lpProc)
  {    
   return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_CALLBACK_FRAME, 0, lpProc);
  }
   private bool capSetVideoFormat(IntPtr hCapWnd, ref showVideo.BITMAPINFO BmpFormat, int CapFormatSize)
  {
   return showVideo.SendMessage(hCapWnd, showVideo.WM_CAP_SET_VIDEOFORMAT, CapFormatSize, ref BmpFormat);
  }
   private void FrameCallBack(IntPtr lwnd, IntPtr lpVHdr)
  {
   showVideo.VIDEOHDR videoHeader = new showVideo.VIDEOHDR();
   byte[] VideoData;
   videoHeader = (showVideo.VIDEOHDR)showVideo.GetStructure(lpVHdr,videoHeader);
   VideoData = new byte[videoHeader.dwBytesUsed];
   showVideo.Copy(videoHeader.lpData ,VideoData);
   if (this.RecievedFrame != null)  this.RecievedFrame (VideoData);
  }

 }

}

 

namespace DongFengHealth
{
 ///
 /// Form1 的摘要说明。
 ///
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Panel panelPreview;
  private System.Windows.Forms.Button b_play;
  private System.Windows.Forms.Button b_stop;
  ///
  /// 必需的设计器变量。
  ///
  private System.ComponentModel.Container components = null;
  private System.Windows.Forms.Button button1;
  private System.Windows.Forms.Button button2;
  private System.Windows.Forms.Button button3;
  Camera wc;

  public Form1()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }

  ///
  /// 清理所有正在使用的资源。
  ///
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  ///
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  ///
  private void InitializeComponent()
  {
   this.b_play = new System.Windows.Forms.Button();
   this.panelPreview = new System.Windows.Forms.Panel();
   this.b_stop = new System.Windows.Forms.Button();
   this.button1 = new System.Windows.Forms.Button();
   this.button2 = new System.Windows.Forms.Button();
   this.button3 = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // b_play
   //
   this.b_play.Location = new System.Drawing.Point(276, 368);
   this.b_play.Name = "b_play";
   this.b_play.TabIndex = 0;
   this.b_play.Text = "&Play";
   this.b_play.Click += new System.EventHandler(this.button1_Click);
   //
   // panelPreview
   //
   this.panelPreview.Location = new System.Drawing.Point(52, 16);
   this.panelPreview.Name = "panelPreview";
   this.panelPreview.Size = new System.Drawing.Size(360, 260);
   this.panelPreview.TabIndex = 1;
   //
   // b_stop
   //
   this.b_stop.Enabled = false;
   this.b_stop.Location = new System.Drawing.Point(360, 368);
   this.b_stop.Name = "b_stop";
   this.b_stop.TabIndex = 2;
   this.b_stop.Text = "&Stop";
   this.b_stop.Click += new System.EventHandler(this.b_stop_Click);
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(192, 368);
   this.button1.Name = "button1";
   this.button1.TabIndex = 3;
   this.button1.Text = "Grab";
   this.button1.Click += new System.EventHandler(this.button1_Click_1);
   //
   // button2
   //
   this.button2.Location = new System.Drawing.Point(24, 368);
   this.button2.Name = "button2";
   this.button2.TabIndex = 4;
   this.button2.Text = "Record";
   this.button2.Click += new System.EventHandler(this.button2_Click);
   //
   // button3
   //
   this.button3.Location = new System.Drawing.Point(108, 368);
   this.button3.Name = "button3";
   this.button3.TabIndex = 5;
   this.button3.Text = "Store";
   this.button3.Click += new System.EventHandler(this.button3_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(464, 413);
   this.Controls.Add(this.button3);
   this.Controls.Add(this.button2);
   this.Controls.Add(this.button1);
   this.Controls.Add(this.b_stop);
   this.Controls.Add(this.panelPreview);
   this.Controls.Add(this.b_play);
   this.MaximizeBox = false;
   this.MinimizeBox = false;
   this.Name = "Form1";
   this.Text = "GoodView test Web Camera";
   this.Load += new System.EventHandler(this.Form1_Load);
   this.ResumeLayout(false);

  }
  #endregion

  ///
  /// 应用程序的主入口点。
  ///
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }

  private void Form1_Load(object sender, System.EventArgs e)
  {
   b_play.Enabled = false;
   b_stop.Enabled = true;
   //panelPreview.Size = new Size(330,330);
   wc = new Camera( panelPreview.Handle,panelPreview.Width,panelPreview.Height);
   wc.StartCamera();
  }

  private void button1_Click(object sender, System.EventArgs e)
  {
   b_play.Enabled = false;
   b_stop.Enabled = true;
   panelPreview.Size = new Size(330,330);
   wc = new Camera( panelPreview.Handle,panelPreview.Width,panelPreview.Height);
   wc.StartCamera();
  }

  private void b_stop_Click(object sender, System.EventArgs e)
  {
   b_play.Enabled = true;
   b_stop.Enabled = false;
   wc.CloseCamera();
  }

  private void button1_Click_1(object sender, System.EventArgs e)
  {
   wc.capImage(wc.lwndC, "d://xxxx.bmp");
   wc.bitMapToJPG("d://xxxx.bmp","d://xxxx.jpg");
  }

  private void button2_Click(object sender, System.EventArgs e)
  {
   wc.capScope(wc.lwndC,"d://xxxx.avi");
  }

  private void button3_Click(object sender, System.EventArgs e)
  {
   wc.stopCapScope(wc.lwndC);
  }
 }
}