这段代码希望对你有所启发,RegionFromBitmap函数中的picSource是一个Picture控件,里面放Mask图(有效步分缺省为黑色)Option Explicit
Private Declare Function CombineRgn Lib "gdi32" (ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long
Private Declare Function CreateRectRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Declare Function GetPixel Lib "gdi32" (ByVal hDC As Long, ByVal X As Long, ByVal Y As Long) As Long
Private Declare Function ReleaseCapture Lib "user32" () As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As LongPrivate Const RGN_OR = 2
Private lngRegion As Long
Dim Trfl
Dim Trfl2Function RegionFromBitmap(picSource As PictureBox, Optional lngTransColor As Long) As Long
Dim lngRetr As Long, lngHeight As Long, lngWidth As Long
Dim lngRgnFinal As Long, lngRgnTmp As Long
Dim lngStart As Long, lngRow As Long
Dim lngCol As Long
If lngTransColor& < 1 Then
lngTransColor& = GetPixel(picSource.hDC, 0, 0)
End If
lngHeight& = picSource.Height / Screen.TwipsPerPixelY
lngWidth& = picSource.Width / Screen.TwipsPerPixelX
lngRgnFinal& = CreateRectRgn(0, 0, 0, 0)
For lngRow& = 0 To lngHeight& - 1
lngCol& = 0
Do While lngCol& < lngWidth&
Do While lngCol& < lngWidth& And GetPixel(picSource.hDC, lngCol&, lngRow&) = lngTransColor&
lngCol& = lngCol& + 1
Loop
If lngCol& < lngWidth& Then
lngStart& = lngCol&
Do While lngCol& < lngWidth& And GetPixel(picSource.hDC, lngCol&, lngRow&) <> lngTransColor&
lngCol& = lngCol& + 1
Loop
If lngCol& > lngWidth& Then lngCol& = lngWidth&
lngRgnTmp& = CreateRectRgn(lngStart&, lngRow&, lngCol&, lngRow& + 1)
lngRetr& = CombineRgn(lngRgnFinal&, lngRgnFinal&, lngRgnTmp&, RGN_OR)
DeleteObject (lngRgnTmp&)
End If
Loop
Next
RegionFromBitmap& = lngRgnFinal&
End Function这样调用
Sub ChangeMask()
Dim lngRetr As Long
lngRegion& = RegionFromBitmap(PicMask) 'PicMask是Picture控件的名字
lngRetr& = SetWindowRgn(Me.hWnd, lngRegion&, True)
End Sub
Private Declare Function CombineRgn Lib "gdi32" (ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long
Private Declare Function CreateRectRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Declare Function GetPixel Lib "gdi32" (ByVal hDC As Long, ByVal X As Long, ByVal Y As Long) As Long
Private Declare Function ReleaseCapture Lib "user32" () As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As LongPrivate Const RGN_OR = 2
Private lngRegion As Long
Dim Trfl
Dim Trfl2Function RegionFromBitmap(picSource As PictureBox, Optional lngTransColor As Long) As Long
Dim lngRetr As Long, lngHeight As Long, lngWidth As Long
Dim lngRgnFinal As Long, lngRgnTmp As Long
Dim lngStart As Long, lngRow As Long
Dim lngCol As Long
If lngTransColor& < 1 Then
lngTransColor& = GetPixel(picSource.hDC, 0, 0)
End If
lngHeight& = picSource.Height / Screen.TwipsPerPixelY
lngWidth& = picSource.Width / Screen.TwipsPerPixelX
lngRgnFinal& = CreateRectRgn(0, 0, 0, 0)
For lngRow& = 0 To lngHeight& - 1
lngCol& = 0
Do While lngCol& < lngWidth&
Do While lngCol& < lngWidth& And GetPixel(picSource.hDC, lngCol&, lngRow&) = lngTransColor&
lngCol& = lngCol& + 1
Loop
If lngCol& < lngWidth& Then
lngStart& = lngCol&
Do While lngCol& < lngWidth& And GetPixel(picSource.hDC, lngCol&, lngRow&) <> lngTransColor&
lngCol& = lngCol& + 1
Loop
If lngCol& > lngWidth& Then lngCol& = lngWidth&
lngRgnTmp& = CreateRectRgn(lngStart&, lngRow&, lngCol&, lngRow& + 1)
lngRetr& = CombineRgn(lngRgnFinal&, lngRgnFinal&, lngRgnTmp&, RGN_OR)
DeleteObject (lngRgnTmp&)
End If
Loop
Next
RegionFromBitmap& = lngRgnFinal&
End Function这样调用
Sub ChangeMask()
Dim lngRetr As Long
lngRegion& = RegionFromBitmap(PicMask) 'PicMask是Picture控件的名字
lngRetr& = SetWindowRgn(Me.hWnd, lngRegion&, True)
End Sub
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