Imports System.Runtime.InteropServices
Imports System.Security.Cryptography
Imports System.Text
Imports System.Text.Encoding


Namespace Enumeration
    Public Class Window

#Region " Declares "
        <DllImport("user32.dll", EntryPoint:="GetWindowText")> _
            Private Shared Sub GetWindowText _
                (ByVal hWnd As IntPtr, ByVal sbText As StringBuilder, ByVal iLength As Integer)
        End Sub

        <DllImport("user32.dll", EntryPoint:="IsWindowVisible")> _
            Private Shared Function IsWindowVisible _
                (ByVal hWnd As IntPtr) As Boolean
        End Function

        <DllImport("user32.dll", EntryPoint:="IsIconic")> _
            Private Shared Function IsIconic _
                (ByVal hWnd As IntPtr) As Boolean
        End Function

        <DllImport("user32.dll")> _
            Private Shared Function GetWindowRect _
                (ByVal hWnd As IntPtr, ByRef rectBounds As RECT) As Boolean
        End Function

        <StructLayout(LayoutKind.Sequential)> _
        Private Structure RECT
            Public Left As Integer
            Public Top As Integer
            Public Right As Integer
            Public Bottom As Integer

            Public Sub New(ByVal pLeft As Integer, ByVal pTop As Integer, ByVal pRight As Integer, ByVal pBottom As Integer)
                Left = pLeft
                Top = pTop
                Right = pRight
                Bottom = pBottom
            End Sub

            Public ReadOnly Property Height() As Integer
                Get
                    Return Bottom - Top
                End Get
            End Property
            Public ReadOnly Property Width() As Integer
                Get
                    Return Right - Left
                End Get
            End Property
            Public ReadOnly Property Location() As Point
                Get
                    Return New Point(Left, Top)
                End Get
            End Property
            Public ReadOnly Property Size() As Size
                Get
                    Return New Size(Width, Height)
                End Get
            End Property

            Public Function ToRectangle() As Rectangle
                Return Rectangle.FromLTRB(Me.Left, Me.Top, Me.Right, Me.Bottom)
            End Function

            Public Shared Function FromRectangle(ByVal r As Rectangle) As RECT
                Return New RECT(r.Left, r.Top, r.Right, r.Bottom)
            End Function
        End Structure

        <DllImport("user32.dll")> _
            Private Shared Function PrintWindow _
                (ByVal hWnd As IntPtr, ByVal hDC As IntPtr, ByVal iFlags As UInteger) As Boolean
        End Function

        <DllImport("user32.dll")> _
            Private Shared Function ShowWindow _
                (ByVal hWnd As IntPtr, ByVal iFlags As ShowWindowEnum) As Boolean
        End Function

        Private Enum ShowWindowEnum
            Hide = 0
            ShowNormal = 1
            ShowMinimized = 2
            ShowMaximized = 3
            Maximize = 3
            ShowNormalNoActivate = 4
            Show = 5
            Minimize = 6
            ShowMinNoActivate = 7
            ShowNoActivate = 8
            Restore = 9
            ShowDefault = 10
            ForceMinimized = 11
        End Enum

        <DllImport("user32.dll")> _
            Private Shared Function SendMessage _
                (ByVal hWnd As IntPtr, ByVal iMsg As UInteger, ByVal wParam As UInteger, ByVal lParam As UInteger) As UInteger
        End Function

        <DllImport("user32.dll")> _
            Private Shared Function GetWindowLong _
                (ByVal hWnd As IntPtr, ByVal iIndex As Integer) As Integer
        End Function

        <DllImport("user32.dll")> _
            Private Shared Function SetWindowLong _
                (ByVal hWnd As IntPtr, ByVal iIndex As Integer, ByVal iNewLong As Integer) As Integer
        End Function

        <DllImport("user32.dll")> _
            Private Shared Function SetLayeredWindowAttributes _
                (ByVal hWnd As IntPtr, ByVal bytCrey As Byte, ByVal bytAlpha As Byte, ByVal iFlags As Integer) As Integer
        End Function


        Public Const WM_PAINT = &HF

        Public Const GWL_EXSTYLE = (-20)
        Public Const WS_EX_LAYERED = &H80000
        Public Const LWA_ALPHA = &H2
#End Region

        Private mhWnd As IntPtr

        Sub New(ByVal hWnd As IntPtr)
            mhWnd = hWnd
        End Sub

        Public ReadOnly Property Handle() As IntPtr
            Get
                Return mhWnd
            End Get
        End Property

        Public ReadOnly Property Title() As String
            Get
                Dim sbTitle As New StringBuilder(1024)
                GetWindowText(mhWnd, sbTitle, sbTitle.Capacity)
                Return sbTitle.ToString
            End Get
        End Property

        Public ReadOnly Property Visible() As Boolean
            Get
                Return IsWindowVisible(mhWnd)
            End Get
        End Property

        Public ReadOnly Property Minimized() As Boolean
            Get
                Return IsIconic(mhWnd)
            End Get
        End Property

        Public ReadOnly Property Bounds() As Rectangle
            Get
                Dim rectBounds As New RECT
                GetWindowRect(mhWnd, rectBounds)
                Return rectBounds.ToRectangle
            End Get
        End Property

        Public ReadOnly Property Mentionable() As Boolean
            Get
                If Title.Length > 0 And Not Title.Equals("Program Manager") And Not Title.Equals("Start") And Visible Then
                    Return True
                Else
                    Return False
                End If
            End Get
        End Property

        Public ReadOnly Property Key() As String
            Get
                Return System.Convert.ToBase64String(UTF8.GetBytes(mhWnd.ToString))
            End Get
        End Property



        Public Function Image() As Bitmap
            Dim bSpecial As Boolean = Minimized

            If (bSpecial) Then EnterSpecialCapturing()

            'FIX

            Dim bmp As Bitmap

            Dim rctBounds As Rectangle = Bounds

            Try
                If (rctBounds.IsEmpty Or rctBounds.Height < 0 Or rctBounds.Width < 0) Then bmp = Nothing

                bmp = New Bitmap(rctBounds.Width, rctBounds.Height)
                Dim g As Graphics = Graphics.FromImage(bmp)
                Dim dc As IntPtr = g.GetHdc()

                PrintWindow(mhWnd, dc, 0)

                g.ReleaseHdc()
                g.Dispose()
            Catch
                bmp = Nothing
            End Try

            'FIX

            If (bSpecial) Then ExitSpecialCapturing(mhWnd)
        End Function

End Namespace