We are calling a standard C DLL (using the EXTERN "C" __declspec(dllexport)
interface definition) from a VB ActiveX DLL passing  a reference to a VB
String (sort of an IDL "out" type parameter) that is to be updated  in the C
DLL.
The problem is that it seems to be crashing when the thread of control
returns to the the VB DLL.
Calling the same C DLL from another standard C DLL does not have the
problem. Is there anything specific that we should be aware of when calling
standard DLL's from VB ActiveX DLL's?

TIA
Clyde.

Clyde,

Use the _stdcall calling convention on the exported function, it's the
only one VB supports. And also make sure you pre-allocate the string
parameter large enough to contain everything the function will put in
it.

It's hard to say more than that without seeing the function prototype
and the calling code.

Mattias

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