Hi,

I understand we can use AddressOf in VB5 or greater to send Callback
function. I just work like to know how to write a VC function to handle the
VB AddressOf pointer. Could anyone help?

For example:

VB6

Call VCCallBack(AddressOf MyFunction)

...

Public Function MyFunction
...
End Function

VC6

How to write the code to receive the procedure pointer to MyFunction and
call it from VC?

Any idea? TIA.

- Eric

There are at least two ways you can do this.

This first way may also be compatible with C:

void FunctionX(int(*A)(int A, int B))
{
 // Use the function
 int X = (*A)(12,1);

int MyCallbackFunction(int A, int B);

// To actually send the function
FunctionX(MyCallbackFunction);

The second way uses the OOP aspect of C++

class CallbackBase_FunctionX
{
public:
 virtual int Call(int A, int B) = 0; // Make this class "purely abstract"

class MyCallbackFunction: public CallbackBase_FunctionX
{
public:
 virtual int Call(int A, int B)
 {
  // Code
 };

I haven't tried compiling the code so this may be subject to a little syntax
correction, but it should demonstrate the idea well enough.

Also, this should work on any compiler.

Hope this helped
CJ

Also,

you probably should have sent your question to a more relevant group, like
comp.lang.c++ (maybe), or microsoft.public.vc.language, instead of a group
about debugging.

Sorry to the regular posters here if I was not suppost to respond to an
off-topic post. I didn't realize that I was in a topic-specific group. (Is
there a FAQ I should read?)

CJ