webcam access through win32 API in C#

	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Text;
	using System.Runtime.InteropServices;
	namespace mycam
	{
	public class Cam
	{
	[DllImport("kernel32.dll")]
	private static extern void Sleep(int dwMilliseconds);
	[DllImport("kernel32.dll")]
	private static extern int Beep(int dwFreq, int dwDuration);
	[DllImport("avicap32.dll", EntryPoint = "capCreateCaptureWindowW")]
	private static extern int capCreateCaptureWindow(string lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, int hWndParent, int nID);
	private const int WS_VISIBLE = 0x10000000;
	private const int WS_CHILD = 0x40000000;
	[DllImport("user32.dll", EntryPoint = "SendMessageW")]
	private static extern int SendMessage(int hwnd, int wMsg, int wParam, int lParam);
	[DllImport("user32.dll", EntryPoint = "SendMessageW")]
	private static extern int SendMessageFL(int hwnd, int wMsg, int wParam, string lParam);
	[DllImport("user32.dll", EntryPoint = "SendMessageW")]
	private static extern int SendMessageSD(int hwnd, int wMsg, string wParam, int lParam);
	private const int WM_USER = 0x400;
	private const int WM_CAP_DRIVER_CONNECT = (WM_CAP_START + 10);
	private const int WM_CAP_START = WM_USER;
	private const int WM_CAP_FILE_SAVEDIBA = (WM_CAP_START + 25);
	private const int WM_CAP_SET_SCALE = WM_USER + 53;
	private const int WM_CAP_SET_PREVIEW = WM_USER + 50;
	private const int WM_CAP_SET_PREVIEWRATE = WM_USER + 52;
	private const int WM_CAP_FILE_SAVEDIB = WM_USER + 25;
	private const int WM_CAP_DRIVER_DISCONNECT = WM_USER + 11;
	private string _camtitle;// = "HDCam";// pointer
	private int hWebcam;
	private const int nDevice = 0;
	private const int nFPS = 50;
	private string _filename;// = "IMAGE.BMP";
	public int getCAM(string cam_title,int cam_x,int cam_y,int cam_width,int cam_height,IntPtr HWNDparent,int cam_ID)
	{
	//Beep(2000, 50);
	_camtitle = cam_title;
	hWebcam = capCreateCaptureWindow(cam_title, WS_VISIBLE + WS_CHILD, cam_x, cam_y,cam_width,cam_height, HWNDparent.ToInt32(), cam_ID);
	//Sleep(5000);
	//inSequence(sender ,e);
	return hWebcam;
	}
	public void makeBEEP(int FREQUENCY)
	{
	Beep(FREQUENCY, 50);
	}
	public string NewFileNAME()
	{
	DateTime DT = new DateTime();
	DT.Date.ToString();
	return "File" + DT.Date.ToString();
	}
	public void startCAM()
	{
	//makeBEEP(3000);
	SendMessage(hWebcam, WM_CAP_DRIVER_CONNECT, nDevice, 0);
	SendMessage(hWebcam, WM_CAP_SET_SCALE, 1, 0);
	SendMessage(hWebcam, WM_CAP_SET_PREVIEWRATE, nFPS, 0);
	SendMessage(hWebcam, WM_CAP_SET_PREVIEW, 1, 0);
	}
	public void captureCAM(string BMPfilename)
	{
	_filename = BMPfilename;
	//string flnm = NewFileNAME();
	//this.Text = flnm;
	//makeBEEP(3000);
	//SendMessageS(hWebcam, WM_CAP_FILE_SAVEDIBA, 0,_filename);
	SendMessageFL(hWebcam, WM_CAP_FILE_SAVEDIBA, 0, _filename);
	makeBEEP(3500);
	//}
	}
	public void stopCAM()
	{
	//SendMessage(hWebcam, WM_CAP_DRIVER_DISCONNECT, _camtitle, 0);
	SendMessageSD(hWebcam, WM_CAP_DRIVER_DISCONNECT, _camtitle, 0);
	}
	}
	}

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