Csharp/C Sharp/2D Graphics/Screen

Get Screen Resolution

<source lang="csharp">

 using System;
 using System.Drawing;
 using System.Drawing.Drawing2D;
 using System.Collections;
 using System.ruponentModel;
 using System.Windows.Forms;
 using System.Data;
 using System.Drawing.Imaging;
 public class Form1 : System.Windows.Forms.Form
 {
   public Form1()
   {
     InitializeComponent();
   }
   private void InitializeComponent()
   {
     this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
     this.ClientSize = new System.Drawing.Size(292, 273);
     this.Text = "";
     this.Resize += new System.EventHandler(this.Form1_Resize);
     this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
   }
   static void Main() 
   {
     Application.Run(new Form1());
   }
   private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
   {      
     Graphics g = e.Graphics;
     Bitmap bmp = new Bitmap("winter.jpg");
     g.DrawImage(bmp, 0, 0);
     Console.WriteLine("Screen resolution: " + g.DpiX + "DPI");
     Console.WriteLine("Image resolution: " + bmp.HorizontalResolution + "DPI");
     Console.WriteLine("Image Width: " + bmp.Width);
     Console.WriteLine("Image Height: " + bmp.Height);
     SizeF s = new SizeF(bmp.Width * (g.DpiX / bmp.HorizontalResolution),
               bmp.Height * (g.DpiY / bmp.VerticalResolution));
     Console.WriteLine("Display size of image: " + s);
   }
   private void Form1_Resize(object sender, System.EventArgs e)
   {
     Invalidate();
   }
 }

      </source>

Perform a Screen Capture

<source lang="csharp">

using System; using System.Drawing; using System.Runtime.InteropServices; using System.Windows.Forms; public class DesktopCapture {

   [DllImport("user32.dll")]
   private extern static IntPtr GetDesktopWindow();
   [DllImport("user32.dll")]
   private extern static IntPtr GetDC(IntPtr windowHandle);
   [DllImport("gdi32.dll")]
   private extern static IntPtr GetCurrentObject(IntPtr hdc,
     ushort objectType);
   [DllImport("user32.dll")]
   private extern static void ReleaseDC( IntPtr hdc );
   const int OBJ_BITMAP = 7;
   public static Bitmap Capture() {
       IntPtr desktopWindow = GetDesktopWindow();
       IntPtr desktopDC = GetDC( desktopWindow );
       IntPtr desktopBitmap = GetCurrentObject(desktopDC, OBJ_BITMAP);
       Bitmap desktopImage = Image.FromHbitmap( desktopBitmap );
       ReleaseDC(desktopDC);
       return desktopImage;
   }

}

</source>