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BitBlt from an image control

Posted on 2000-03-26
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Last Modified: 2008-02-26
I have used picture boxes and the API function BitBlt without any problem. The picture box has a hDC handle for the API function.

I am now using an image control and need to BitBlt the image to a form and/or printer hDc.  I need the image control for it's stetch attribute,which a picture box does not have.  Anyone know of a way to get the hDc for an image control, or another method to move this image directory to a form or printer hDc?

The only thing I thought of, is, when I need to put the image, is move the image control picture to a hidden picture box, and then use StretchBlt to put the image on the form, from the piture box.  A bit of coding and processor cycles.  Any other ideas?
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Question by:rmichels
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Expert Comment

by:Erick37
ID: 2659586
Put an Image Control *inside* a PictureBox Control, then you can use the hDC of the PictureBox:

Private Sub Command1_Click()
    With Picture1
    .BorderStyle = 0 'none
    Image1.Stretch = True
    Image1.Top = 0
    Image1.Left = 0
    Set Image1.Picture = LoadPicture("c:\test.bmp")
    'Set Picture1 same size as Image1
    .Width = Image1.Width
    .Height = Image1.Height
    .Refresh
   
    'Optional - Now use bitblt
    Call BitBlt(Me.hDC, 0, 0, .Width / 15, .Height / 15, .hDC, 0, 0, vbSrcCopy)
   
    End With
End Sub
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Expert Comment

by:Ark
ID: 2659603
Hi
Why you need only BitBlt function? You can use Render method for stdPicture object:

Private Sub Command_Click()
  Dim stdPic As StdPicture, outhDc As Long
  Set stdPic = Image1.Picture
  outhDc = Me.hdc
' or outhDc = Printer.hdc
  stdPic.Render outhDc, 100, 100, 200, 200, 0, 0, stdPic.Width, stdPic.Height, vbNull
End Sub
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Ark earned 400 total points
ID: 2659697
BTW, if you choose Image control only for stretching, you can simply do this with Picturebox:

Private Sub Command1_Click()
  StretchPB Picture1
End Sub

Private Sub StretchPB(pic As PictureBox)
  Dim stdPic As StdPicture
  Set stdPic = pic.Picture
  pic.AutoRedraw = True
  pic.PaintPicture stdPic, 0, 0, pic.Width, pic.Height
  pic.Picture = pic.Image
' If you need
'  pic.AutoRedraw = False
End Sub
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LVL 28

Expert Comment

by:Ark
ID: 2659710
Hi
About using Render instead of BitBlt. Sorry, one bug - stdPicture has reverse height counting - from bottom to up, so you get reverse picture. Change this string:
  stdPic.Render outhDc, 100, 100, 200, 200, 0, 0, stdPic.Width, stdPic.Height, vbNull

to

  stdPic.Render outhDc, 100, 100, 200, 200, 0, stdPicture.Height, stdPic.Width, -stdPic.Height, vbNull

You can also flip pictures with render method

Cheers
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Author Comment

by:rmichels
ID: 2660734
hmmm, good comments.  I'll try these tonight and see which one works best.

In the mean time I did try my solution above, by setting a picturebox = to my image control, and then using bitblt into the destinati on.  One problem I have is that the image control seems to have a better shrink algorithm than BitBlt.  BitBlt leaves a mess on the image when I shrink it.
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Author Comment

by:rmichels
ID: 2664145
Thanks, the code to do the stretching worked out good, as i really would rather use a picture box.  It has a get focus event that was missing in the image control, which made my life even easier.
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