Problem with bitblt

Posted on 1999-11-13
Medium Priority
Last Modified: 2008-03-04
I have a form with PicBoxA in side FrameA and PicBoxB in PicBoxC and i am trying to copy PicBoxB to PicBoxA. but when i try vb gives me the error.
Can't create autoredraw image.
if i turn autoredraw off on PicBoxA and PicBoxB it works but i want autoredraw on.

Form setup
||                         Main Form                              ||
||  /-------------------------\            //===========\\   ||
||  |    FrameA          |            || PicBoxC         ||   ||
||  |   ****************  |            || ****************  ||   ||
||  |  * PicBoxA     *  |            || * PicBoxB    * ||   ||
||  |  *****************  |            || **************** ||   ||
||  \-------------------------/            \\===========//  ||
This probly wont look right but i hope you see what i mean.
I am trying to copy PicBoxB to PicBoxA

Question by:centaurs
  • 3
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Expert Comment

ID: 2205631
What if you set AutoRedraw to false just before the BitBlt line? and then set AutoRedraw back to true when done..
LVL 32

Expert Comment

ID: 2205638
If PicBoxB is contained in PicBoxC, try making PicBoxB's container the form, then position it over PicBoxC.

The only reference to this error (480) that I could find from MS relates only to VB3 and VB4.
LVL 32

Expert Comment

ID: 2205656
This error may also be the result of low system memory.  By setting the autoredraw property true, the system makes a memory image of the object's surface. If you have large images, or a lot of images, your memory resources will be depleted.

Try closing unneeded applications before you run the program.  Also try compiling into an EXE and run the program with VB closed.

This is a trappable error, so you can use On Error to trap it before the program crashes.  This way, the user knows there is not enough memory. (If this is really the problem).
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Author Comment

ID: 2206014
Thanks every one ill try some of these ideas shortly.
both images are very big so there is a good chance that that is the problem.
and i cant just put it over it because it needs to be scrolable because both Pic A & B about 16000 pixels wide and high. I guess i just make it smaller and  hopefuly it will work other wise ill try VBMasters idea.

Author Comment

ID: 2206046
Erick 37 it worked now if you want your points just answer the question.
LVL 32

Accepted Solution

Erick37 earned 1600 total points
ID: 2206095
If you have preloaded a picture into the PictureBox's .Picture property, you can clear the image when you are done with blitting by calling
Picture1.Picture = LoadPicture("").
This will also free some memory resources.

Also, if you turn off the Autoredraw property, you can use the PictureBox's Paint event to keep the image refreshed.  This will prevent the second image from having to be stored in memory:


Private Sub Picture1_Paint()
    BitBlt Picture1.hDC, 0, 0, 300, 300, _
           Picture2.hDC, 0, 0, vbSrcCopy
End Sub

Author Comment

ID: 2207310

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