[Dev-C++] C++ and C function pointers

[Patrick, M. <Mic...@sp...>]

Hello all,

I'm in no way a master of C++ and all its rules and regulations and I don't
think what I need to do can actually be done, but it never hurts to ask
anyway.

I have to create a simple API using a C++ library (required by management)
that interfaces with an old C library beneath it.  My problem is that the
old C library has 3 or 4 function calls, each of which takes a function
pointer, to allow you to handle the results as you wish.  This is fine, but
I need to take the returned values (from the function pointer call) and use
them with a bunch of my own variables currently held in a class.

From my understanding, there is no way to mask a C++ class method as a C
function (something to do with the this pointer).  Do you know of any way to
overcome this?

My current work around is by using a global structure X which has variables
a, b and c.  The class D configures variable a and b and the callback
function configures variable c.  The class D then takes all 3 variables and
handles them with method doWork() to display the results to the user. 

Typedef  Struct hndlmyStruct{
	Int a
	Int b
	Int c
} myStruct

class D{
	public:
		doWork(){
				this.add()
				};
	private:
		add(){
			cout << X.a + X.b + X.c;
		};
}

void function( int y){
	X.c = 3;
}

myStruct X;

void main{
	new D


	X.a = 1
	X.b = 2
	LibraryCommand( function )

	D.doWork();
}


What I would like to do is pass the method doWork() as the function pointer,
but I'm almost positive you can't do this.  Another work around is if I can
somehow give the callback function access to the class D.

Is any of this possible or should I just stick with the global structure?

Hope this makes some sense, I'll clarify anything if need be.

Michael