>>>>>With the new dll I am now getting:
>>>>>
>>>>>Managed Debugging Assistant 'PInvokeStackImbalance' occurred
>>>>> Message=Managed Debugging Assistant 'PInvokeStackImbalance' : 'A call to PInvoke function 'Siriusware.Middleware!Siriusware.Middleware.ValidationPass::Invoke1' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.'
>>>>>
>>>>>But no crash as before.
>>>>
>>>>See what the CallingConvention of the Siriuseware invoke1 is
>>>
>>>The C++ declaration is
>>>
>>>

>>>EXTERN_C LPCTSTR Invoke1	(LPCTSTR szIn)
>>>{
>>>	AFX_MANAGE_STATE(AfxGetStaticModuleState());
>>>
>>>	pMainEngine->m_cei.Clear();
>>>	pMainEngine->ProcessCall(CString(szIn), theApp.m_csRet);
>>>	return theApp.m_csRet;
>>>}

>>>
>>>Does it help?
>>
>>Not to me.
>>
>>Try cdecl
>
>I tried, got 0 error, but the result looked like Chinese characters, not the normal string it was supposed to return.
First ask your collegue what the calling convention is
It’s not in the signature. Or have him put it in the signature