[2005] Problem with BitBlt from Bitmap to Bitmap
Hi.
Can someone tell me why this doesn't work?
I would expect the end result to be all red, but nothing happens.
If I remove the source bitmap and graphics object and just use "hdcSrc=GetDC(0)" then I get a screenshot, so I know the BitBlt function works.
It appears that the BitBlt function can't copy from one memory image to another.
So, can anyone answer this:
Are there any problems BitBlt'ing two memory images? Or does it have to be real physical devicecontexts?
VB Code:
Dim bmpDst, bmpSrc As Bitmap
Dim grpDst, grpSrc As Graphics
Dim hdcDst, hdcSrc As IntPtr
bmpDst = New Bitmap(Panel1.ClientRectangle.Width, Panel1.ClientRectangle.Height)
bmpSrc = New Bitmap(Panel1.ClientRectangle.Width, Panel1.ClientRectangle.Height)
grpDst = Graphics.FromImage(bmpDst)
grpSrc = Graphics.FromImage(bmpSrc)
grpDst.Clear(Color.Black)
grpSrc.Clear(Color.Red)
grpSrc.Flush()
hdcDst = grpDst.GetHdc
hdcSrc = grpSrc.GetHdc
Win32.Declarations.BitBlt(hdcDst, 0, 0, bmpDst.Width, bmpDst.Height, hdcSrc, 0, 0, Win32.Constants.BitBltConstants.SRCCOPY)
grpSrc.ReleaseHdc(hdcSrc)
grpDst.ReleaseHdc(hdcDst)
grpSrc.Dispose()
grpDst.Dispose()
e.Graphics.DrawImage(bmpDst, 0, 0)
bmpDst.Dispose()
bmpSrc.Dispose()
Thanks
Re: [2005] Problem with BitBlt from Bitmap to Bitmap
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