[ADVANCED] - Passing structures via WM_COPYDATA [SOLVED]

[Axonn]

Hi everybody ::- D. Does anybody know how to get the size of a structure in Visual Basic? I need this to pass a structure to VC++ via WM_COPYDATA ::- ). The structure is this:

Public Type SomeStructure
      xx As Long
      yy As Long
End Type

Of course, I use COPYDATASTRUCT like this:

Public Type CopyDataStruct
      dwData As Long
      cbData As Long
      lpData As Long
End Type

And the variables are:

Public cpy As CopyDataStruct
Public some As SomeStructure

And the call is:

some.xx = 4
   some.yy = 6
   
   cpy.cbData = 8
   cpy.dwData = 101
   cpy.lpData = VarPtr(nu)
   SendMessage 131198, WM_COPYDATA, Me.hwnd, cpy

And of course, the error is: OVERFLOW.

It's probably 'cause of that cbData = 8. I am not sure if the size of the structure is 8 bytes. It's two longs so it should be, right? But isn't there some command to find that out?