help convert from VB6 to VB.NET

Code:

---

Option Explicit
Const AC_SRC_OVER = &H0
Const SW_MINIMIZE = 6

Private Type BLENDFUNCTION
  BlendOp As Byte
  BlendFlags As Byte
  SourceConstantAlpha As Byte
  AlphaFormat As Byte
End Type
Private Type BITMAP
    bmType As Long
    bmWidth As Long
    bmHeight As Long
    bmWidthBytes As Long
    bmPlanes As Integer
    bmBitsPixel As Integer
    bmBits As Long
End Type
Private Type POINTAPI
    x As Long
    y As Long
End Type
Private Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function GetObject Lib "gdi32" Alias "GetObjectA" (ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) As Long
Private Declare Sub RtlMoveMemory Lib "kernel32.dll" (Destination As Any, Source As Any, ByVal Length As Long)
Private Declare Function AlphaBlend Lib "msimg32.dll" (ByVal hdc As Long, ByVal lInt As Long, ByVal lInt As Long, ByVal lInt As Long, ByVal lInt As Long, ByVal hdc As Long, ByVal lInt As Long, ByVal lInt As Long, ByVal lInt As Long, ByVal lInt As Long, ByVal BLENDFUNCT As Long) As Long
Private Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function GetForegroundWindow Lib "user32" () As Long
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long

Dim STDHdc As Long, STDSpec As Long, PicPos As POINTAPI
Dim BufBit As Long, BufHdc As Long

Dim bf As BLENDFUNCTION

Private Sub Command1_Click()
blur 3
End Sub

Private Sub Form_Load()
Timer1.Enabled = False
Me.Caption = "Shut Me down"
Me.WindowState = 0
Me.Show

BufHdc = CreateCompatibleDC(0)
BufBit = CreateCompatibleBitmap(GetDC(0), 401, 401)
SelectObject BufHdc, BufBit

STDHdc = CreateCompatibleDC(0)
STDSpec = CreateCompatibleBitmap(GetDC(0), 401, 401)
SelectObject STDHdc, STDSpec
Timer1.Interval = 2000
Timer1.Enabled = True

End Sub

Private Sub Form_Unload(Cancel As Integer)
DeleteDC STDHdc
DeleteDC BufHdc
DeleteObject BufBit
DeleteObject STDSpec
End
End Sub


Private Sub blur(intensity As Integer)
Dim x As Long, y As Long, SPREAD As Single, LBF As Long

SPREAD = 128
With bf
    .BlendOp = AC_SRC_OVER
    .BlendFlags = 0
    .SourceConstantAlpha = SPREAD
    .AlphaFormat = 0
End With
RtlMoveMemory LBF, bf, 4

PicPos.x = 100
PicPos.y = 100
 
BitBlt STDHdc, 0, 0, 401, 401, _
        GetDC(0), PicPos.x - 200, PicPos.y - 200, vbSrcCopy
BitBlt BufHdc, 0, 0, 401, 401, STDHdc, 0, 0, vbSrcCopy

If intensity > 0 Then
    For x = 0 To intensity - 1
            AlphaBlend BufHdc, 0, 0, 400, 401, _
                STDHdc, 1, 0, 400, 401, LBF
            BitBlt STDHdc, 0, 0, 401, 401, _
                BufHdc, 0, 0, vbSrcCopy
            AlphaBlend BufHdc, 1, 0, 400, 401, _
                STDHdc, 0, 0, 400, 401, LBF
            BitBlt STDHdc, 0, 0, 401, 401, _
                BufHdc, 0, 0, vbSrcCopy
            AlphaBlend BufHdc, 0, 0, 401, 400, _
                STDHdc, 0, 1, 401, 400, LBF
            BitBlt STDHdc, 0, 0, 401, 401, _
                BufHdc, 0, 0, vbSrcCopy
            AlphaBlend BufHdc, 0, 1, 401, 400, _
                STDHdc, 0, 0, 401, 400, LBF
            BitBlt STDHdc, 0, 0, 401, 401, _
                BufHdc, 0, 0, vbSrcCopy
            AlphaBlend BufHdc, 0, 0, 400, 400, _
                STDHdc, 1, 1, 400, 400, LBF
            BitBlt STDHdc, 0, 0, 401, 401, _
                BufHdc, 0, 0, vbSrcCopy
            AlphaBlend BufHdc, 1, 1, 400, 400, _
                STDHdc, 0, 0, 400, 400, LBF
            BitBlt STDHdc, 0, 0, 401, 401, _
                BufHdc, 0, 0, vbSrcCopy
            AlphaBlend BufHdc, 0, 1, 400, 400, _
                STDHdc, 1, 0, 400, 400, LBF
            BitBlt STDHdc, 0, 0, 401, 401, _
                BufHdc, 0, 0, vbSrcCopy
            AlphaBlend BufHdc, 1, 0, 400, 400, _
                STDHdc, 0, 1, 400, 400, LBF
            BitBlt STDHdc, 0, 0, 401, 401, _
                BufHdc, 0, 0, vbSrcCopy
    Next
End If
BitBlt GetDC(0), PicPos.x - 200, PicPos.y - 200, 401, 401, _
    BufHdc, 0, 0, vbSrcCopy

End Sub
Private Sub Timer1_Timer()

Timer1.Enabled = False

End Sub

---

vb.net Code:

Imports System.Runtime.InteropServices
 
Public Class Form1
 
    Friend WithEvents Command1 As Button
    Friend WithEvents timer1 As Timer
 
    Private Const AC_SRC_OVER As Integer = &H0
    Private Const SW_MINIMIZE As Integer = 6
 
    Public Sub New()
 
        ' This call is required by the designer.
        InitializeComponent()
 
        ' Add any initialization after the InitializeComponent() call.
        Me.SuspendLayout()
        Command1 = New Button
        timer1 = New Timer
 
        With Command1
            .Text = "Click"
            .Width = 250
            .Height = 20
            .Left = 10
            .Top = 10
            .Visible = True
        End With
 
        With timer1
            .Enabled = False
        End With
 
        Me.Controls.Add(Command1)
        Me.components.Add(timer1)
        Me.ResumeLayout()
    End Sub
 
    <StructLayout(LayoutKind.Sequential)> _
    Private Structure BLENDFUNCTION
        Dim BlendOp As Byte
        Dim BlendFlags As Byte
        Dim SourceConstantAlpha As Byte
        Dim AlphaFormat As Byte
    End Structure
 
    <StructLayout(LayoutKind.Sequential)> _
    Private Structure BITMAP
        Dim bmType As Integer
        Dim bmWidth As Integer
        Dim bmHeight As Integer
        Dim bmWidthBytes As Integer
        Dim bmPlanes As Short
        Dim bmBitsPixel As Short
        Dim bmBits As Integer
    End Structure
 
    <StructLayout(LayoutKind.Sequential)> _
    Private Structure POINTAPI
        Dim x As Integer
        Dim y As Integer
    End Structure
 
    <DllImport("gdi32", CharSet:=CharSet.Auto, setlasterror:=True)> _
    Private Shared Function CreateCompatibleBitmap(ByVal hdc As IntPtr, ByVal nWidth As Integer, ByVal nHeight As Integer) As IntPtr
    End Function
 
    <DllImport("gdi32", CharSet:=CharSet.Auto, setlasterror:=True)> _
    Private Shared Function CreateCompatibleDC(ByVal hdc As IntPtr) As IntPtr
    End Function
 
    <DllImport("gdi32", CharSet:=CharSet.Auto, setlasterror:=True)> _
    Private Shared Function SelectObject(ByVal hdc As IntPtr, ByVal hObject As IntPtr) As Integer
    End Function
 
    <DllImport("gdi32", CharSet:=CharSet.Auto, setlasterror:=True)> _
    Private Shared Function GetObject(ByVal hObject As IntPtr, ByVal nCount As Integer, ByVal lpObject As IntPtr) As Integer
    End Function
 
    <DllImport("kernel32.dll", EntryPoint:="RtlMoveMemory", SetLastError:=True, CharSet:=CharSet.Auto)> _
    Private Shared Sub RtlMoveMemory(<[In](), MarshalAs(UnmanagedType.I4)> ByVal hpvDest As Int32, <[In](), Out()> ByVal hpvSource() As Byte, ByVal cbCopy As Integer)
    End Sub
 
    <DllImport("gdi32.dll", EntryPoint:="GdiAlphaBlend", setlasterror:=True)> _
    Private Shared Function AlphaBlend(ByVal hdcDest As IntPtr,
                                  ByVal nXOriginDest As Integer, _
                                  ByVal nYOriginDest As Integer, _
                                  ByVal nWidthDest As Integer, _
                                  ByVal nHeightDest As Integer, _
                                  ByVal hdcSrc As IntPtr, _
                                  ByVal nXOriginSrc As Integer, _
                                  ByVal nYOriginSrc As Integer, _
                                  ByVal nWidthSrc As Integer, _
                                  ByVal nHeightSrc As Integer, _
                                  ByVal blendfunction As BLENDFUNCTION) As Boolean
    End Function
 
    Private Enum TernaryRasterOperations As UInteger
        ''' <summary>dest = source</summary>
        SRCCOPY = &HCC0020
        ''' <summary>dest = source OR dest</summary>
        SRCPAINT = &HEE0086
        ''' <summary>dest = source AND dest</summary>
        SRCAND = &H8800C6
        ''' <summary>dest = source XOR dest</summary>
        SRCINVERT = &H660046
        ''' <summary>dest = source AND (NOT dest)</summary>
        SRCERASE = &H440328
        ''' <summary>dest = (NOT source)</summary>
        NOTSRCCOPY = &H330008
        ''' <summary>dest = (NOT src) AND (NOT dest)</summary>
        NOTSRCERASE = &H1100A6
        ''' <summary>dest = (source AND pattern)</summary>
        MERGECOPY = &HC000CA
        ''' <summary>dest = (NOT source) OR dest</summary>
        MERGEPAINT = &HBB0226
        ''' <summary>dest = pattern</summary>
        PATCOPY = &HF00021
        ''' <summary>dest = DPSnoo</summary>
        PATPAINT = &HFB0A09
        ''' <summary>dest = pattern XOR dest</summary>
        PATINVERT = &H5A0049
        ''' <summary>dest = (NOT dest)</summary>
        DSTINVERT = &H550009
        ''' <summary>dest = BLACK</summary>
        BLACKNESS = &H42
        ''' <summary>dest = WHITE</summary>
        WHITENESS = &HFF0062
    End Enum
 
    <DllImport("gdi32.dll", setlasterror:=True)> _
    Private Shared Function BitBlt(ByVal hdc As IntPtr, _
                                   ByVal nXDest As Integer, _
                                   ByVal nYDest As Integer, _
                                   ByVal nWidth As Integer, _
                                   ByVal nHeight As Integer, _
                                   ByVal hdcSrc As IntPtr, _
                                   ByVal nXSrc As Integer, _
                                   ByVal nYSrc As Integer, _
                                   ByVal dwRop As TernaryRasterOperations) As Boolean
    End Function
 
    <DllImport("gdi32.dll", setlasterror:=True)> _
    Private Shared Function DeleteDC(ByVal hdc As IntPtr) As Integer
    End Function
 
    <DllImport("gdi32.dll", setlasterror:=True)> _
    Private Shared Function DeleteObject(ByVal hObject As IntPtr) As Integer
    End Function
 
    <DllImport("user32.dll", setlasterror:=True)> _
    Private Shared Function GetDC(ByVal hwnd As IntPtr) As IntPtr
    End Function
 
    <DllImport("user32.dll", setlasterror:=True)> _
    Private Shared Function GetForegroundWindow() As IntPtr
    End Function
 
    <DllImport("user32.dll", setlasterror:=True)> _
    Private Shared Function ShowWindow(ByVal hwnd As IntPtr, ByVal nCmdShow As Integer) As Integer
    End Function
 
    Dim STDHdc As IntPtr, STDSpec As IntPtr, PicPos As POINTAPI
    Dim BufBit As IntPtr, BufHdc As IntPtr
 
    Dim bf As New BLENDFUNCTION
 
    Private Sub Command1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Command1.Click
        blur(3)
    End Sub
 
    Private Sub Form_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        timer1.Enabled = False
        Me.Text = "Shut Me down"
        Me.WindowState = FormWindowState.Normal
        Me.Show()
 
        BufHdc = CreateCompatibleDC(IntPtr.Zero)
        BufBit = CreateCompatibleBitmap(GetDC(IntPtr.Zero), 401, 401)
        SelectObject(BufHdc, BufBit)
 
        STDHdc = CreateCompatibleDC(IntPtr.Zero)
        STDSpec = CreateCompatibleBitmap(GetDC(IntPtr.Zero), 401, 401)
        SelectObject(STDHdc, STDSpec)
        timer1.Interval = 2000
        timer1.Enabled = True
 
    End Sub
 
    Private Sub Form_Unload(ByVal sender As Object, ByVal e As FormClosingEventArgs) Handles Me.FormClosing
        DeleteDC(STDHdc)
        DeleteDC(BufHdc)
        DeleteObject(BufBit)
        DeleteObject(STDSpec)
    End Sub
 
    Private Sub blur(ByVal intensity As Short)
        Dim SPREAD As Byte
 
        SPREAD = 128
        With bf
            .BlendOp = AC_SRC_OVER
            .BlendFlags = 0
            .SourceConstantAlpha = SPREAD
            .AlphaFormat = 0
        End With
 
        'RtlMoveMemory(LBF, bf, 4) Not necessary due to the modified declaration
 
        PicPos.x = 100
        PicPos.y = 100
 
        BitBlt(STDHdc, 0, 0, 401, 401, _
                GetDC(IntPtr.Zero), PicPos.x - 200, PicPos.y - 200, TernaryRasterOperations.SRCCOPY)
        BitBlt(BufHdc, 0, 0, 401, 401, STDHdc, 0, 0, TernaryRasterOperations.SRCCOPY)
 
        If intensity > 0 Then
            For x = 0 To intensity - 1
                AlphaBlend(BufHdc, 0, 0, 400, 401, _
                    STDHdc, 1, 0, 400, 401, bf)
                BitBlt(STDHdc, 0, 0, 401, 401, _
                    BufHdc, 0, 0, TernaryRasterOperations.SRCCOPY)
                AlphaBlend(BufHdc, 1, 0, 400, 401, _
                    STDHdc, 0, 0, 400, 401, bf)
                BitBlt(STDHdc, 0, 0, 401, 401, _
                    BufHdc, 0, 0, TernaryRasterOperations.SRCCOPY)
                AlphaBlend(BufHdc, 0, 0, 401, 400, _
                    STDHdc, 0, 1, 401, 400, bf)
                BitBlt(STDHdc, 0, 0, 401, 401, _
                    BufHdc, 0, 0, TernaryRasterOperations.SRCCOPY)
                AlphaBlend(BufHdc, 0, 1, 401, 400, _
                    STDHdc, 0, 0, 401, 400, bf)
                BitBlt(STDHdc, 0, 0, 401, 401, _
                    BufHdc, 0, 0, TernaryRasterOperations.SRCCOPY)
                AlphaBlend(BufHdc, 0, 0, 400, 400, _
                    STDHdc, 1, 1, 400, 400, bf)
                BitBlt(STDHdc, 0, 0, 401, 401, _
                    BufHdc, 0, 0, TernaryRasterOperations.SRCCOPY)
                AlphaBlend(BufHdc, 1, 1, 400, 400, _
                    STDHdc, 0, 0, 400, 400, bf)
                BitBlt(STDHdc, 0, 0, 401, 401, _
                    BufHdc, 0, 0, TernaryRasterOperations.SRCCOPY)
                AlphaBlend(BufHdc, 0, 1, 400, 400, _
                    STDHdc, 1, 0, 400, 400, bf)
                BitBlt(STDHdc, 0, 0, 401, 401, _
                    BufHdc, 0, 0, TernaryRasterOperations.SRCCOPY)
                AlphaBlend(BufHdc, 1, 0, 400, 400, _
                    STDHdc, 0, 1, 400, 400, bf)
                BitBlt(STDHdc, 0, 0, 401, 401, _
                    BufHdc, 0, 0, TernaryRasterOperations.SRCCOPY)
            Next
        End If
        BitBlt(GetDC(IntPtr.Zero), PicPos.x - 200, PicPos.y - 200, 401, 401, _
            BufHdc, 0, 0, TernaryRasterOperations.SRCCOPY)
 
    End Sub
 
    Private Sub Timer1_Timer() Handles timer1.Tick
        timer1.Enabled = False
    End Sub
 
End Class

thx but it doesnt blur :O

Sorry, but I didn't write this code I merely converted it to VB.Net

o ok

What is it supposed to do?

Supposedly it should apply a blur filter to an image but I seriously doubt this code is working.
Because there is nowhere a real source device context is selected. Everywhere IntPtr.Zero is given as an argument.

in vb6 its working!