how to put a class in a dll

[Chris Holbrook]

I know almost nothing about DLLs - just enough to call them. I wrote one in Pascal about 10 years ago but didn't enjoy it, so I gave it up.

So suppose I had defined a class and wanted to put it in a DLL - would I have to write functions to call the interface methods and expose these functions or is there a way of exposing the whole interface?

Possibly there are examples around but so far I have managed to miss them - or misunderstand them, just as likely!

Any clues would be appreciated.

[Chris Holbrook]

This is the only method which I know short of creating a COM object which a) restricts the use to applications which can call COM objects and b) I am in too much of a hurry to learn, though I know it will happen one day.

So is that all there is to it?

' application calling function in dll
#compile exe
#dim all

declare function addone lib "dlltest.DLL" alias "AddOne" (byval x&) as long

function pbmain () as long
    local s as string
    ? str$(AddOne(1))
end function

DLL containing a procedure implemented as a method in a Class and an exported function which calls it

' dll containing object code
#compile dll

class myclass
    interface myClass_1
        inherit iunknown
        method AddOne (byval x as long) as long
            method = x + 1
        end method
    end interface
end class

function AddOne alias "AddOne" (byval x as long) export as long
    local mc as myclass_1
    
    mc = class "MyClass"
    function = mc.Addone (x)
end function

[Fred Harris]

Hi Chris!

At...

http://www.powerbasic.com/support/pbforums/showthread.php?t=39266

is a reworked example of mine from the PB help (the With Events stuff) that shows how to put a class in the dll (which also sends events to a class implemeented in a client of the dll). It was Ian Bayly's original post. You had replied to it too.

Also, over at Jose's web site down in my section bout' a week ago I posted a custom control tutorial. Don't know for sure if that's what you want though because that's a Window Class in the dll - not a oop class.

[Chris Holbrook]

http://www.powerbasic.com/support/pbforums/showthread.php?t=39266[/url]

Thanks Fred, that is a nice example in post #6.