>>Thanks. I'll probably have to play with this. The actual ZIP4_PARM structure has about 50 fields only one of which is this compound structure so the debugging is going to be fun.
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>In that case, I'd make an "eleventh" string/object that contains the other 50 fields and concatenate that with the other 10 strings.
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>>The API was written in C++ and all of the docs are for C++ which I am not versed in at all. I'm really hoping that this struct class of Christof's will work for me here because I think that I would have even a worse time trying to code an FLL in C++ since, apart from the language barrier, I'd still need to have a clearer understanding of how C is working with these structures etc.
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>As long as you're not dealing with "doubles", you might be OK. I think there's a bug in the convert.FLL when it comes to handling doubles.

That's OK - the latest version of CLSHeap has a fast and accurate conversion of the DOUBLE data type.