Passing a hDC to a linked DLL file and How to make VB Compatable C++ functions

Can a Linked DLL use a passed hDC to modify an image?

What is the special way to declaring C++ function so that they can be used within VB?

you use declare statement:

Code:

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Declare Function FunctionName Lib "dllname" (byval a as Long, byval b as Long, byval Whatever as Any....) As Long

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You could check out the file Win32api in your winapi dir, which has a lot of declare statements you can have as samples.

And yes you can pass hDC to modify the image.