showvideo.cs

该即时通讯系统系统能够实现像QQ一样的通讯功能

using  System;
using  System.Runtime.InteropServices;
namespace  LanMsg.AV
{
	
	public  class  showVideo
	{
		[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  );

		public  const  int  WM_USER  =  0x400;
		public  const  int  WS_CHILD  =  0x40000000;
		public  const  int  WS_VISIBLE  =  0x10000000;
		public  const  int  SWP_NOMOVE  =  0x2;
		public  const  int  SWP_NOZORDER  =  0x4;
		public  const  int  WM_CAP_DRIVER_CONNECT  =  WM_USER  +  10;
		public  const  int  WM_CAP_DRIVER_DISCONNECT  =  WM_USER  +  11;
		public  const  int  WM_CAP_SET_CALLBACK_FRAME  =  WM_USER  +  5;
		public  const  int  WM_CAP_SET_PREVIEW  =  WM_USER  +  50;
		public  const  int  WM_CAP_SET_PREVIEWRATE  =  WM_USER  +  52;
		public  const  int  WM_CAP_SET_VIDEOFORMAT  =  WM_USER  +  45;
  
		[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  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);  
		}
	}

	public  class  Camera
	{
		public  Camera(IntPtr  handle,  int  width,int  height)
		{
			mControlPtr  =  handle;
			mWidth  =  width;
			mHeight  =  height;
		}
  
		public  delegate  void  RecievedFrameEventHandler(byte[]  data);
		public  event  RecievedFrameEventHandler  RecievedFrame;
  
		private  IntPtr  lwndC;  
		private  IntPtr  mControlPtr;  
		private  int  mWidth;
		private  int  mHeight;
  
		private  showVideo.FrameEventHandler  mFrameEventHandler;  //  Delegate  instance  for  the  frame  callback  -  must  keep  alive!  gc  should  NOT  collect  it
  
		public  void  CloseWebcam()
		{
			this.capDriverDisconnect(this.lwndC);
		}
  
		public  void  StartWebCam()
		{
			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);
			}  
		}

		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);
		}
	}

}