'下面的方法不一定可以 但是 他是这么说的 '透明 'form中 有一个picture1 一个command1 Option ExplicitPrivate Sub Command1_Click() Dim R As RECT With R .Left = 0 .Top = 0 .Right = Picture1.ScaleWidth .Bottom = Picture1.ScaleHeight End With TransparentBlt Form1.hdc, Form1.hdc, Picture1.hdc, R, 20, 20, vbWhite Picture1.Visible = False End Sub'bas 中 Option Explicit Public Type RECT Left As Long Top As Long Right As Long Bottom As Long End TypePublic Declare Function BitBlt Lib "gdi32" (ByVal hDCDest As Long, ByVal XDest As Long, ByVal YDest As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hDCSrc As Long, ByVal XSrc As Long, ByVal YSrc As Long, ByVal dwRop As Long) As Long Public Declare Function CreateBitmap Lib "gdi32" (ByVal nWidth As Long, ByVal nHeight As Long, ByVal nPlanes As Long, ByVal nBitCount As Long, lpBits As Any) As Long Public Declare Function SetBkColor Lib "gdi32" _ (ByVal hdc As Long, ByVal crColor As Long) As Long Public Declare Function SelectObject Lib "gdi32" _ (ByVal hdc As Long, ByVal hObject As Long) As Long Public Declare Function CreateCompatibleBitmap Lib "gdi32" _ (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long Public Declare Function CreateCompatibleDC Lib "gdi32" _ (ByVal hdc As Long) As Long Public Declare Function DeleteDC Lib "gdi32" _ (ByVal hdc As Long) As Long Public Declare Function DeleteObject Lib "gdi32" _ (ByVal hObject As Long) As LongPublic Sub TransparentBlt(OutDstDC As Long, DstDC As Long, SrcDC As Long, SrcRect As RECT, DstX As Integer, DstY As Integer, TransColor As Long) 'DstDC- Device context into which image must be drawn transparently 'OutDstDC- Device context into image is actually drawn, even though 'it is made transparent in terms of DstDC 'Src- Device context of source to be made transparent in color TransColor 'SrcRect- Rectangular region within SrcDC to be made transparent in terms of 'DstDC, and drawn to OutDstDC 'DstX, DstY - Coordinates in OutDstDC (and DstDC) where the transparent bitmap must go 'In most cases, OutDstDC and DstDC will be the same Dim nRet As Long, W As Integer, H As Integer Dim MonoMaskDC As Long, hMonoMask As Long Dim MonoInvDC As Long, hMonoInv As Long Dim ResultDstDC As Long, hResultDst As Long Dim ResultSrcDC As Long, hResultSrc As Long Dim hPrevMask As Long, hPrevInv As Long Dim hPrevSrc As Long, hPrevDst As Long W = SrcRect.Right - SrcRect.Left + 1 H = SrcRect.Bottom - SrcRect.Top + 1 'create monochrome mask and inverse masks MonoMaskDC = CreateCompatibleDC(DstDC) MonoInvDC = CreateCompatibleDC(DstDC) hMonoMask = CreateBitmap(W, H, 1, 1, ByVal 0&) hMonoInv = CreateBitmap(W, H, 1, 1, ByVal 0&) hPrevMask = SelectObject(MonoMaskDC, hMonoMask) hPrevInv = SelectObject(MonoInvDC, hMonoInv) 'create keeper DCs and bitmaps ResultDstDC = CreateCompatibleDC(DstDC) ResultSrcDC = CreateCompatibleDC(DstDC) hResultDst = CreateCompatibleBitmap(DstDC, W, H) hResultSrc = CreateCompatibleBitmap(DstDC, W, H) hPrevDst = SelectObject(ResultDstDC, hResultDst) hPrevSrc = SelectObject(ResultSrcDC, hResultSrc) 'copy src to monochrome mask Dim OldBC As Long OldBC = SetBkColor(SrcDC, TransColor) nRet = BitBlt(MonoMaskDC, 0, 0, W, H, SrcDC, SrcRect.Left, SrcRect.Top, vbSrcCopy) TransColor = SetBkColor(SrcDC, OldBC) 'create inverse of mask nRet = BitBlt(MonoInvDC, 0, 0, W, H, MonoMaskDC, 0, 0, vbNotSrcCopy) 'get background nRet = BitBlt(ResultDstDC, 0, 0, W, H, DstDC, DstX, DstY, vbSrcCopy) 'AND with Monochrome mask nRet = BitBlt(ResultDstDC, 0, 0, W, H, MonoMaskDC, 0, 0, vbSrcAnd) 'get overlapper nRet = BitBlt(ResultSrcDC, 0, 0, W, H, SrcDC, SrcRect.Left, SrcRect.Top, vbSrcCopy) 'AND with inverse monochrome mask nRet = BitBlt(ResultSrcDC, 0, 0, W, H, MonoInvDC, 0, 0, vbSrcAnd) 'XOR these two nRet = BitBlt(ResultDstDC, 0, 0, W, H, ResultSrcDC, 0, 0, vbSrcInvert) 'output results nRet = BitBlt(OutDstDC, DstX, DstY, W, H, ResultDstDC, 0, 0, vbSrcCopy) 'clean up hMonoMask = SelectObject(MonoMaskDC, hPrevMask) DeleteObject hMonoMask hMonoInv = SelectObject(MonoInvDC, hPrevInv) DeleteObject hMonoInv hResultDst = SelectObject(ResultDstDC, hPrevDst) DeleteObject hResultDst hResultSrc = SelectObject(ResultSrcDC, hPrevSrc) DeleteObject hResultSrc DeleteDC MonoMaskDC DeleteDC MonoInvDC DeleteDC ResultDstDC DeleteDC ResultSrcDC End Sub'请注意保存 比较容易停在哪里
不对呀,这样我在picturebox上的操作不就是看不见了么,这不是我要的效果。我是想在picturebox中画线,并且picturebox是透明的,这样画线操作就想是直接在form上操作一样
'form中 有一个picture1 一个command1
Option ExplicitPrivate Sub Command1_Click()
Dim R As RECT
With R
.Left = 0
.Top = 0
.Right = Picture1.ScaleWidth
.Bottom = Picture1.ScaleHeight
End With
TransparentBlt Form1.hdc, Form1.hdc, Picture1.hdc, R, 20, 20, vbWhite
Picture1.Visible = False
End Sub'bas 中
Option Explicit
Public Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End TypePublic Declare Function BitBlt Lib "gdi32" (ByVal hDCDest As Long, ByVal XDest As Long, ByVal YDest As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hDCSrc As Long, ByVal XSrc As Long, ByVal YSrc As Long, ByVal dwRop As Long) As Long
Public Declare Function CreateBitmap Lib "gdi32" (ByVal nWidth As Long, ByVal nHeight As Long, ByVal nPlanes As Long, ByVal nBitCount As Long, lpBits As Any) As Long
Public Declare Function SetBkColor Lib "gdi32" _
(ByVal hdc As Long, ByVal crColor As Long) As Long
Public Declare Function SelectObject Lib "gdi32" _
(ByVal hdc As Long, ByVal hObject As Long) As Long
Public Declare Function CreateCompatibleBitmap Lib "gdi32" _
(ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Public Declare Function CreateCompatibleDC Lib "gdi32" _
(ByVal hdc As Long) As Long
Public Declare Function DeleteDC Lib "gdi32" _
(ByVal hdc As Long) As Long
Public Declare Function DeleteObject Lib "gdi32" _
(ByVal hObject As Long) As LongPublic Sub TransparentBlt(OutDstDC As Long, DstDC As Long, SrcDC As Long, SrcRect As RECT, DstX As Integer, DstY As Integer, TransColor As Long)
'DstDC- Device context into which image must be drawn transparently
'OutDstDC- Device context into image is actually drawn, even though
'it is made transparent in terms of DstDC
'Src- Device context of source to be made transparent in color TransColor 'SrcRect- Rectangular region within SrcDC to be made transparent in terms of
'DstDC, and drawn to OutDstDC
'DstX, DstY - Coordinates in OutDstDC (and DstDC) where the transparent bitmap must go
'In most cases, OutDstDC and DstDC will be the same
Dim nRet As Long, W As Integer, H As Integer
Dim MonoMaskDC As Long, hMonoMask As Long
Dim MonoInvDC As Long, hMonoInv As Long
Dim ResultDstDC As Long, hResultDst As Long
Dim ResultSrcDC As Long, hResultSrc As Long
Dim hPrevMask As Long, hPrevInv As Long
Dim hPrevSrc As Long, hPrevDst As Long
W = SrcRect.Right - SrcRect.Left + 1
H = SrcRect.Bottom - SrcRect.Top + 1
'create monochrome mask and inverse masks
MonoMaskDC = CreateCompatibleDC(DstDC)
MonoInvDC = CreateCompatibleDC(DstDC)
hMonoMask = CreateBitmap(W, H, 1, 1, ByVal 0&)
hMonoInv = CreateBitmap(W, H, 1, 1, ByVal 0&)
hPrevMask = SelectObject(MonoMaskDC, hMonoMask)
hPrevInv = SelectObject(MonoInvDC, hMonoInv)
'create keeper DCs and bitmaps
ResultDstDC = CreateCompatibleDC(DstDC)
ResultSrcDC = CreateCompatibleDC(DstDC)
hResultDst = CreateCompatibleBitmap(DstDC, W, H)
hResultSrc = CreateCompatibleBitmap(DstDC, W, H)
hPrevDst = SelectObject(ResultDstDC, hResultDst)
hPrevSrc = SelectObject(ResultSrcDC, hResultSrc)
'copy src to monochrome mask
Dim OldBC As Long
OldBC = SetBkColor(SrcDC, TransColor)
nRet = BitBlt(MonoMaskDC, 0, 0, W, H, SrcDC, SrcRect.Left, SrcRect.Top, vbSrcCopy)
TransColor = SetBkColor(SrcDC, OldBC)
'create inverse of mask
nRet = BitBlt(MonoInvDC, 0, 0, W, H, MonoMaskDC, 0, 0, vbNotSrcCopy)
'get background
nRet = BitBlt(ResultDstDC, 0, 0, W, H, DstDC, DstX, DstY, vbSrcCopy)
'AND with Monochrome mask
nRet = BitBlt(ResultDstDC, 0, 0, W, H, MonoMaskDC, 0, 0, vbSrcAnd)
'get overlapper
nRet = BitBlt(ResultSrcDC, 0, 0, W, H, SrcDC, SrcRect.Left, SrcRect.Top, vbSrcCopy)
'AND with inverse monochrome mask
nRet = BitBlt(ResultSrcDC, 0, 0, W, H, MonoInvDC, 0, 0, vbSrcAnd)
'XOR these two
nRet = BitBlt(ResultDstDC, 0, 0, W, H, ResultSrcDC, 0, 0, vbSrcInvert)
'output results
nRet = BitBlt(OutDstDC, DstX, DstY, W, H, ResultDstDC, 0, 0, vbSrcCopy)
'clean up
hMonoMask = SelectObject(MonoMaskDC, hPrevMask)
DeleteObject hMonoMask
hMonoInv = SelectObject(MonoInvDC, hPrevInv)
DeleteObject hMonoInv
hResultDst = SelectObject(ResultDstDC, hPrevDst)
DeleteObject hResultDst
hResultSrc = SelectObject(ResultSrcDC, hPrevSrc)
DeleteObject hResultSrc
DeleteDC MonoMaskDC
DeleteDC MonoInvDC
DeleteDC ResultDstDC
DeleteDC ResultSrcDC
End Sub'请注意保存 比较容易停在哪里