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VB 5/6-Tipp 0243: VB-Blur Demo

 von Dirk Lietzow

Schwierigkeitsgrad:

Verwendete API-Aufrufe: BitBlt, RtlMoveMemory (CopyMemory), GetObjectA (GetObject), VarPtr (VarPtrArray)

Download: Download des Beispielprojektes [18,8 KB]

'Dieser Quellcode stammt von http://www.activevb.de
'und kann frei verwendet werden. Für eventuelle Schäden
'wird nicht gehaftet.

'Um Fehler oder Fragen zu klären, nutzen Sie bitte unser Forum.
'Ansonsten viel Spaß und Erfolg mit diesem Source!

'------------- Anfang Projektdatei Projekt1.vbp -------------
'--------- Anfang Formular "Form1" alias Form1.frm  ---------
' Steuerelement: Schaltfläche "Command2"
' Steuerelement: Bildfeld-Steuerelement "Picture2"
' Steuerelement: Bildfeld-Steuerelement "Picture1"
' Steuerelement: Beschriftungsfeld "Label2"
' Steuerelement: Anzeige-Steuerelement "Image2"
' Steuerelement: Anzeige-Steuerelement "Image1"
' Steuerelement: Beschriftungsfeld "Label1" (Index von 0 bis 3)

Option Explicit

Private Declare Function VarPtrArray Lib "msvbvm50.dll" _
        Alias "VarPtr" (ptr() As Any) As Long
        
Private Declare Sub CopyMemory Lib "kernel32" Alias _
        "RtlMoveMemory" (pDst As Any, pSrc As Any, ByVal _
        ByteLen 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 GetObject Lib "gdi32" Alias _
        "GetObjectA" (ByVal hObject As Long, ByVal nCount _
        As Long, lpObject As Any) As Long

Private Type SAFEARRAYBOUND
  cElements As Long
  lLbound As Long
End Type

Private Type SAFEARRAY1D
  cDims As Integer
  fFeatures As Integer
  cbElements As Long
  cLocks As Long
  pvData As Long
  Bounds(0 To 0) As SAFEARRAYBOUND
End Type

Private Type SAFEARRAY2D
  cDims As Integer
  fFeatures As Integer
  cbElements As Long
  cLocks As Long
  pvData As Long
  Bounds(0 To 1) As SAFEARRAYBOUND
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 Const SRCCOPY = &HCC0020

Dim aa As Long, bb As Long

Private Sub DoBlur(bPic As PictureBox)
   Dim Pict() As Byte
   Dim av As Long
   Dim ptr As Long
   Dim safe As SAFEARRAY1D, bmp As BITMAP
   
    Call GetObject(bPic.Picture, Len(bmp), bmp)
    With safe
      .cbElements = 1
      .cDims = 1
      .Bounds(0).lLbound = 0
      .Bounds(0).cElements = bmp.bmHeight * bmp.bmWidthBytes
      .pvData = bmp.bmBits
    End With
    Call CopyMemory(ByVal VarPtrArray(Pict), VarPtr(safe), 4)
    
    On Error Resume Next

    'Blur algo
    ptr = bmp.bmWidthBytes + 3
    For aa = 1 To bmp.bmHeight - 3
      For bb = 0 To bmp.bmWidthBytes
        ptr = ptr + 1
        av = Pict(ptr - bmp.bmWidthBytes)
        av = av + Pict(ptr - 3)
        av = av + Pict(ptr + 3)
        av = av + Pict(ptr + bmp.bmWidthBytes)
        Pict(ptr) = av \ 4
      Next bb
    Next aa

    Call CopyMemory(ByVal VarPtrArray(Pict), 0&, 4)
End Sub

Private Sub Command2_Click()
  Call SavePicture(Picture2.Picture, App.Path & "\Temp.BMP")
  Picture2.Picture = LoadPicture(App.Path & "\Temp.BMP")
  
  Call DoBlur(Picture2)
  Image1.Picture = Picture1.Image
  Image2.Picture = Picture2.Image
End Sub

Private Sub Form_Load()
  Dim oFS As Integer
  
    oFS = 11
    Picture1.FontSize = oFS
    Picture1.CurrentY = 400
    Picture1.CurrentX = 100
    Picture1.Print "Dieses Beispiel stammt von"
    Picture1.CurrentY = 2400
    Picture1.CurrentX = 100
    Picture1.FontSize = 18
    Picture1.Print "Blur und Preview"
    Picture1.CurrentY = 2800
    Picture1.CurrentX = 100
    Picture1.Print "Demo in VB."
    
    Picture1.FontSize = oFS
    Picture1.CurrentY = 3400
    Picture1.CurrentX = 100
    Picture1.Print "Viel Spaß beim testen,"
    Picture1.CurrentY = 3700
    Picture1.CurrentX = 100
    Picture1.Print "Dirk Lietzow"
    
    Picture2.Picture = Picture1.Image
    Image1.Picture = Picture1.Image
    Image2.Picture = Picture2.Image
End Sub

Private Sub Picture1_Click()
  Picture2.Picture = Picture1.Image
  Image1.Picture = Picture1.Image
  Image2.Picture = Picture2.Image
End Sub

Private Sub Picture2_Click()
  Picture2.Picture = Picture1.Image
  Image1.Picture = Picture1.Image
  Image2.Picture = Picture2.Image
End Sub
'---------- Ende Formular "Form1" alias Form1.frm  ----------
'-------------- Ende Projektdatei Projekt1.vbp --------------

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