C # Open the camera and grab the photo and exit

In fact, the camera in the background grab a picture, can be used to monitor
1. [Code][c#] Code
Using System;
Using System.Collections.Generic;
Using System.Text;
Using System.Diagnostics;

Namespace Myvideoservice
{
    class program
    {
        
        static void Main (string[] args)
        {
             Cvideo video = new Cvideo (Process.getcurrentprocess (). Mainwindowhandle, 379, 316);
            video. Startwebcam ();
            video. Grabimage (Process.getcurrentprocess (). Mainwindowhandle, "d:\\b.jpg");
            video. Closewebcam ();
       }
   }
}

2. [Code][c#] Code
Using System;
Using System.Collections.Generic;
Using System.Text;
Using System.Runtime.InteropServices;
Using System.Drawing.Imaging;
Using System.Drawing;
Using System.IO;

Namespace Myvideoservice
{
public class VIDEOAPI//Video API Class
{
Video API calls
[DllImport ("Avicap32.dll")]
public static extern IntPtr Capcreatecapturewindowa (byte[] lpszwindowname, int dwstyle, int x, int y, int nwidth, int Nhei Ght, 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);
Constant
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;
public const int wm_cap_start = Wm_user;
public const int WM_CAP_SAVEDIB = Wm_cap_start + 25;
}
public class Cvideo//Video class
{
Private INTPTR LWNDC; To save an unsigned handle
Private INTPTR mcontrolptr; Save Management indicators
private int mwidth;
private int mheight;
Public Cvideo (IntPtr handle, int width, int height)
{
Mcontrolptr = handle; To display a handle to a video control
Mwidth = width; Video width
Mheight = height; Video height
}
<summary>
Turn on the video device
</summary>
public void Startwebcam ()
{
byte[] LpszName = new byte[100];
byte[] Lpszver = new byte[100];
Videoapi.capgetdriverdescriptiona (0, LpszName, lpszver, 100);
THIS.LWNDC = Videoapi.capcreatecapturewindowa (lpszName, Videoapi.ws_child | videoapi.ws_visible, 0, 0, mwidth, mheight, mcontrolptr, 0);
if (Videoapi.sendmessage (LWNDC, videoapi.wm_cap_driver_connect, 0, 0))
{
Videoapi.sendmessage (LWNDC, videoapi.wm_cap_set_previewrate, 100, 0);
Videoapi.sendmessage (LWNDC, Videoapi.wm_cap_set_preview, True, 0);
}
}
<summary>
Turn off the video device
</summary>
public void Closewebcam ()
{
Videoapi.sendmessage (LWNDC, videoapi.wm_cap_driver_disconnect, 0, 0);
}
<summary>
Photo
</summary>
<param name= "path" > Path to save the JPEG file </param>
public void Grabimage (IntPtr hwndc, string path)
{
IntPtr hbmp = marshal.stringtohglobalansi (path);

Videoapi.sendmessage (LWNDC, Videoapi.wm_cap_savedib, 0, Hbmp.toint32 ());

Bitmap image = new Bitmap (path);
if (path. Contains ("BMP"))
{
Image. Save (path. Replace ("BMP", "JPG"), imageformat.jpeg);
Image. Dispose ();
if (System.IO.File.Exists (path))
{
Try
{
System.IO.File.Delete (path);
}
catch (System.IO.IOException e)
{
Return
}
}
else {
Image. Save (path, imageformat.jpeg);
Image. Dispose ();
}

}

}
}

}

C # Open the camera and grab the photo and exit