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Imports Microsoft.VisualBasic
Imports System.Runtime.InteropServices
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms
Namespace WindowsFormsApplication1
Partial Public Class Form1
Inherits Form
' Declare external functions.
<DllImport("user32.dll")> _
Private Shared Function GetForegroundWindow() As IntPtr
End Function
<DllImport("user32.dll")> _
Private Shared Function GetWindowText(ByVal hWnd As IntPtr, ByVal text As StringBuilder, ByVal count As Integer) As Integer
End Function
Public Sub New()
InitializeComponent()
End Sub
Private Sub tmrRefresh_Tick(ByVal sender As Object, ByVal e As EventArgs) Handles tmrRefresh.Tick
Dim chars As Integer = 256
Dim buff As New StringBuilder(chars)
' Obtain the handle of the active window.
Dim handle As IntPtr = GetForegroundWindow()
' Update the controls.
If GetWindowText(handle, buff, chars) > 0 Then
lblCaption.Text = buff.ToString()
lblHandle.Text = handle.ToString()
If handle = Me.Handle Then
lblCurrent.Text = "True"
Else
lblCurrent.Text = "False"
End If
End If
End Sub
End Class
End Namespace
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