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bitblt Function in VB 2005

P: n/a
Is there a way to use the windows bitblt function in a VB 2005 app? bitblt
requires device context parameters for the source and destination controls
but those are not used in VB 2005. Is there some way around this? I have a
program that uses a timer ... when it fires I want to copy a small block on
the screen to a particular location.

Thanks

Feb 21 '06 #1
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3 Replies


P: n/a
Have you checked the System.Drawing namespace ?

Basically .NET is about providing access to OS capabilities as a library of
classes (that do not necessarily model the underlying API). For device
context, try System.Drawing.Graphics...

--
Patrice

"fripper" <yo***@indiana.edu> a écrit dans le message de
news:Ob**************@TK2MSFTNGP09.phx.gbl...
Is there a way to use the windows bitblt function in a VB 2005 app? bitblt requires device context parameters for the source and destination controls
but those are not used in VB 2005. Is there some way around this? I have a program that uses a timer ... when it fires I want to copy a small block on the screen to a particular location.

Thanks

Feb 21 '06 #2

P: n/a
"fripper" <yo***@indiana.edu> schrieb:
Is there a way to use the windows bitblt function in a VB 2005 app?
bitblt requires device context parameters for the source and destination
controls but those are not used in VB 2005. Is there some way around
this? I have a program that uses a timer ... when it fires I want to copy
a small block on the screen to a particular location.


If you cannot use the 'Graphics' object to blit the bitmap, you can use a
'Graphics' object to get and release a device context handle (methods
'GetHdc', 'ReleaseHdc').

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

Feb 21 '06 #3

P: n/a
Here's a bit of code using bitblt and the Graphics object..should work in
2005 but don't know since I use 2003:

Private Function CopyRect(ByVal Src As Graphics, ByVal RectF As Rectangle)
As Bitmap
'Create Empty BitMap in Memory
Dim srcBmp As New Bitmap(RectF.Width, RectF.Height, Src)
Dim srcMem As Graphics = Graphics.FromImage(srcBmp)
'Get Device contexts for Source and Memory Graphics Objects
Dim hdcSrc As IntPtr = Src.GetHdc
Dim hdcMem As IntPtr = srcMem.GetHdc
'Get The Picture inside the Rectangle
BitBlt(hdcMem, 0, 0, RectF.Width, RectF.Height, hdcSrc, RectF.X,
RectF.Y, 13369376)
'Return Clone of the BitMap
Dim rb As Bitmap = CType(srcBmp.Clone(), Bitmap)
'Clean Up
Src.ReleaseHdc(hdcSrc)
srcMem.ReleaseHdc(hdcMem)
srcMem.Dispose()
srcMem.Dispose()
Return rb
End Function
--
Dennis in Houston
"fripper" wrote:
Is there a way to use the windows bitblt function in a VB 2005 app? bitblt
requires device context parameters for the source and destination controls
but those are not used in VB 2005. Is there some way around this? I have a
program that uses a timer ... when it fires I want to copy a small block on
the screen to a particular location.

Thanks

Feb 22 '06 #4

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