C++ DLL calling callback function in VB

is it possible for VB to send a function pointer to a C++ DLL and have the DLL call that function?

the VB function is in a standard module and i used this typedef in C++

typedef void (__stdcall *FUNC_PTR)(long);

and i suppose it passes the value right but when i call the function like this

(*callback)(i);

where i have this in the DLL function arguement list

FUNC_PTR callback

is gives one of those illegal operation errors from windows

Make sure the VB function is declared as
Public Sub SomeFunc(ByVal param As Long)
'...
End Sub

and you pass it using AdressOf

it still gives an error

It is very difficult to do the programming in VB (i.e. setting the AddressOf parameters properly, etc.). Make sure that it is correct.

setting addressof parameters? isn't there only one parameter? and thats to a function i wrote in a module

The callback worked for me by using your typedef and writing:

VB Code:

Declare Function MyFunc Lib "mylib.dll" (ByVal addrCallback As Long)
 
Public Sub CB(ByVal l As Long)
  Debug.print Format(l) 
End Sub
 
' In a function
MyFunc(AddressOf(CB))

Code:

---

typedef void (__stdcall *CBFUNC)(long);

void __stdcall MyFunc(CBFUNC f)
{
  f(5);
}

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