Showvideo C # camera driver

Using system;
  Using system. Collections. Generic;
  Using system. text;
  Using system. runtime. interopservices;
  
  
  Namespace webcamera
  {
  ClassShowvideo
  {
  //Showvideo CILS
  [Dllimport ("Avicap32.dll")]
  Public static extern intptr capcreatecapturew.wa (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 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;
  
  // Structures
  [Structlayout (layoutkind. Sequential)]
 Public struct videohdr
  {
  [Financialas (unmanagedtype. I4)]
  Public int lpdata;
  [Financialas (unmanagedtype. I4)]
  Public int dwbufferlength;
  [Financialas (unmanagedtype. I4)]
  Public int dwbytesused;
  [Financialas (unmanagedtype. I4)]
  Public int dwtimecaptured;
  [Financialas (unmanagedtype. I4)]
  Public int dwuser;
  [Financialas (unmanagedtype. I4)]
 Public int dwflags;
  [Financialas (unmanagedtype. byvalarray, sizeconst = 4)]
  Public int [] dwreserved;
  }
  
  [Structlayout (layoutkind. Sequential)]
  Public struct bitmapinfoheader
  {
  [Financialas (unmanagedtype. I4)]
  Public int32 bisize;
  [Financialas (unmanagedtype. I4)]
  Public int32 biwidth;
  [Financialas (unmanagedtype. I4)]
 Public int32 biheight;
  [Financialas (unmanagedtype. I2)]
  Public short biplanes;
  [Financialas (unmanagedtype. I2)]
  Public short bibitcount;
  [Financialas (unmanagedtype. I4)]
  Public int32 bicompression;
  [Financialas (unmanagedtype. I4)]
  Public int32 bisizeimage;
  [Financialas (unmanagedtype. I4)]
  Public int32 bixpelspermeter;
  [Financialas (unmanagedtype. I4)]
 Public int32 biypelspermeter;
  [Financialas (unmanagedtype. I4)]
  Public int32 biclrused;
  [Financialas (unmanagedtype. I4)]
  Public int32 biclrimportant;
  }
  
  [Structlayout (layoutkind. Sequential)]
  Public struct bitmapinfo
  {
  [Financialas (unmanagedtype. struct, sizeconst = 40)]
  Public bitmapinfoheader bmiheader;
  [Financialas (unmanagedtype. byvalarray, sizeconst = 1024)]
 Public int32 [] bmicolors;
  }
  
  Public Delegate void frameeventhandler (intptr lwnd, intptr lpvhdr );
  
  // Public methods
  Public static object getstructure (intptr, 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, 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 );
  }
  
  }
  }