>   pszVarAddr = ppsv->GetVarAddr(pszVarName);
>   (check to make sure its non-zero)
>   m_nBufSize = _msize(pszVarAddr);
> 
> bombs out in debug mode IN DBGHEAP.C in
> _msize_dbg(void * pUserData...)

Did you try compiling your dll in non-debug?  Maybe your dll is 
calling debug versions of malloc library which are possibly not 
compatible with the non-debug versions which PPro is using.



> 
>> 
> Just realised: I the var named in pszVarName might be set to null
> string.  Would that explain?

This should cause getvaraddr to return NULL which I understood you 
were checking for.


> 
> If you can get _msize to work in your code, could you add a new
> PPROSERVICES service GetVarSize(argname)?  

I don't want to do any more on 4.4 at this stage, especially if you 
can get msize to work.







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