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Double Pointer C Node Help

I'm working with the DLL for a piece of hardware I have, and ran across a command where I needed a double pointer to a char in order to get the data I actually want out. Unfortunately, NXG does not seem to have an option for double pointers in .sli files, so I end up pulling garbled data. The command is shown below.GNSS Command.PNG

In reading other forum topics, it would seem that in order to use this command, using the C Node and executing this command there would be the best way to do so. However, I don't know enough C to even do that. Could someone either walk me through the basics of C in order to be able to write the C Node or let me know if there's an alternate solution that doesn't require using a C Node? 

 

Oh, and there was no .h file for the .dll, but there was a .lib. 

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