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I'm trying to create an external function for this method exported by a DLL:
The last parameter is a string array, but I'm not sure how to send that using a JADE external function.

Do I need to use globalAlloc/rtlMoveMemory to create a memory location containing each string and then another one for the array of pointers to those locations?

That's a tricky one. You could try geting the memory address of each of the Strings and then create a Binary with the memory addresses padded together. You'll need to work out the size of a MemoryAddress to cater for 32 vs 64 bit.

If this does not work then the approach I would take is create a wrapper external function which takes the inputs in a form more friendly to JADE. Using an external method you could actually pass in a StringArray, though this would prevent you from running it from a thin client - it would have to run on a node. Another option is to pack the Strings together into a single String and then unpack them in the external function. Not nice, but doable.