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vb5: API Creating Device Contexts / Bitmaps

Posted on 2000-04-09
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Last Modified: 2010-05-02
I've either reached something vb can't do or I'm doing it incorrectly.  I want to be able to create a bitmap in memory and bitblt ONTO that bitmap as well as from it.

CreateCompatibleDC and CreateCompatibleBitmap is what I've used so far with no success.
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Question by:ChrisK
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Expert Comment

by:pjknibbs
ID: 2697597
You've presumably used CreateCompatibleDC() to create a DC, then selected the bitmap created with CreateCompatibleBitmap() into the DC before the blit? (A code sample of what you're trying would have been nice...). The most obvious error I can think of is: you might be calling CreateCompatibleBitmap() with the DC you get from CreateCompatibleDC() as a parameter. A memory DC is created by default with a 1x1 pixel monochrome bitmap, so CreateCompatibleBitmap() will return the same thing when you try it. Make sure you're calling CreateCompatibleBitmap() with the screen DC.
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by:Erick37
ID: 2697865
These may help:

:HOWTO: Create Your Own Bitmap Object Class:
http://support.microsoft.com/support/kb/articles/Q187/5/68.ASP

"HOWTO: Capture and Print the Screen, a Form, or any Window"
http://support.microsoft.com/support/kb/articles/Q161/2/99.ASP
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by:ChrisK
ID: 2698205
Sorry...forgot my code :)

Erick these examples don't do what I'm trying to do.  Loading a bitmap from the hd into a memory allocation works....I want to bitblt onto one.  Example Picture1 is on the form...a real object.  Picture2 is only resident in memory.  I need to be able to bitblt picture1's contents to picture2 and visa versa.

tempdc = CreateCompatibleDC(map.hdc)
CreateCompatibleBitmap tempdc, 400, 400
BitBlt tempdc, 0, 0, 400, 400, map.hdc, 0, 0, vbSrcCopy

map.hdc is a picture box on the form.  So I presumed I was creating another dc with it's attributes.  Specified the size with CreateCompatibleBitmap, then bitblt to it....but I get nothing.
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AzraSound earned 150 total points
ID: 2698352
http://www.vb-helper.com/Howto/picmask.zip

Don't know if thats what youre looking for either
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by:ChrisK
ID: 2698392
azra, submit as the answer.  I was able to figure out what was wrong from that example.

I lacked SelectObject.  Apparently I have to have that before I try to bitblt.
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Expert Comment

by:AzraSound
ID: 2698399
Hello Chris, glad it pointed you in the right direction.  You can just accept my comment above as an answer if you wish.  Cheers!
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