C#

using System;
using System.Drawing;
using System.Runtime.InteropServices;

namespace ScreenShot.interop
{
  /// <summary>
  /// This class encapsulates the API functions necessary to get the
  /// desktop image and form a bitmap from it.
  /// </summary>	
  public sealed class Desktop
  {
    [DllImport("user32.dll")]
    internal extern static IntPtr GetDesktopWindow();

    [DllImport("user32.dll")]
    internal extern static IntPtr GetDC(IntPtr windowHandle);

    [DllImport("gdi32.dll")]
    internal extern static IntPtr GetCurrentObject(IntPtr hdc, ushort objectType);

    [DllImport("user32.dll")]
    internal extern static void ReleaseDC(IntPtr hdc);

    [DllImport("user32.dll")]
    internal extern static void UpdateWindow(IntPtr hwnd);

    [DllImport("user32")]
    internal static extern IntPtr GetWindowDC(IntPtr hwnd);

    [DllImport("user32")]
    public static extern IntPtr GetForegroundWindow();

    /// <summary>
    /// Captures the windows desktop and returns it as a Bitmap
    /// </summary>
    /// <returns></returns>
    internal static Bitmap Capture()
    {
      try
      {
        //Get a pointer to the desktop window
        IntPtr desktopWindow = GetDesktopWindow();

        //Get a device context from the desktop window
        IntPtr desktopDC = GetDC(desktopWindow);

        Bitmap desktopImage = GetBitmap(desktopDC);

        ReleaseDC(desktopDC);

        return desktopImage;
      }
      catch (Exception e)
      {
        ScreenShotConfig.persistance.Logger.Log(typeof(Desktop), "Capture(): " + e.Message);
        return null;
      }
    }

    internal static Bitmap GetBitmap(IntPtr imagePtr)
    {
      //Get a GDI handle to the image
      IntPtr hwnd = GetCurrentObject(imagePtr, 7);

      //This call takes as an argument the handle to a GDI image
      Bitmap desktopImage = Image.FromHbitmap(hwnd);

      return desktopImage;
    }


    internal static Bitmap GetForegroundWindowBitmap()
    {
      IntPtr handle = GetForegroundWindow();

      //Get a device context from the desktop window
      IntPtr windowDC = GetWindowDC(handle);

      //Get a GDI handle to the image
      IntPtr hwnd = GetCurrentObject(windowDC, 0);

      //This call takes as an argument the handle to a GDI image
      Bitmap desktopImage = Image.FromHbitmap(hwnd);

      ReleaseDC(windowDC);

      return desktopImage;
    }

  }
}

Bitmap b = Desktop.Capture();

Rectangle rec = Screen.PrimaryScreen.Bounds;
Bitmap screenCap = new Bitmap(rec.Width, rec.Height, PixelFormat.Format32bppArgb);
Graphics getScreen = Graphics.FromImage(screenCap);
getScreen.CopyFromScreen(rec.X, rec.Y, 0, 0, rec.Size, CopyPixelOperation.SourceCopy);
return screenCap;

<br />
// This variable indicates whether the listen method should keep listening or not ;)<br />
bool KeepListening = false;<br />
<br />
// This is the eventhandler for the "Start Listening" button.<br />
public void button_StartListen_click(object sender, EventArgs e)<br />
{<br />
KeepListening = true;<br />
System.Threading.Thread myListenThread = new System.Threading.Tread(new System.Threading.ThreadStart(Listen));<br />
myListenThread.Start();<br />
}<br />
<br />
// This is the eventhandler for the "Stop Listening" button.<br />
public void button_StopListen_click(object sender, EventArgs e)<br />
{<br />
KeepListening = false;<br />
}<br />
<br />
// This is the Listen method.<br />
private void Listen()<br />
{<br />
while (KeepListening)<br />
{<br />
// Put your "receiving code" in here...<br />
System.Threading.Thread.Sleep(10);<br />
}<br />
}<br />

<br />
private delegate void AddTextInvoker(string textToAdd);<br />

<br />
object [] invokeParams = {"TextOrItemToAdd"};<br />
lbReceived.Invoke(new AddTextInvoker(AddTextToListbox), invokeParams);<br />

<br />
private void AddTextToListbox(string textToAdd)<br />
{<br />
lbReceived.Add(textToAdd);<br />
}<br />

mikone wrote:

TabControls "TabIndexChanged" event.

Amar Chaudhary wrote:

these meathods through exceptions