copy hdc contents to bitmap

问题:

How could you copy the contents of an HDC to a bitmap?

回答1:

Off the top of my head I think you need to:

• Create a new DC compatible with the source DC. Call this the memory DC.
• Create a new bitmap of the correct size.
• Select the bitmap into the memory DC.
• BitBlt the source DC into the memory DC.
• The bitmap should now contain a copy of the source DC.

I'm at home so can't give you any code, so I hope this is enough to get you started. There is a good GDI section on Code Project.

http://www.codeproject.com/KB/graphics/

回答2:

There is a good piece of sample code here that does just that (amongst other things).

I've used a similar technique before (many moons ago), but do not have the code to hand.