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Hi, I need to pass some data to a DLL and need to pass the number of bytes I'm passing also. I tried using 'cast' (should accept anything) for getting the memmap but this fails (polymorphic input cannot accept this datatype) due to an array inside the cluster. Then I wanted to switch to 'flatten to string' for getting the same result and now the arraysize is prepended before the arraydata I stripped down the code to the bare parts but I don't want to unbundle all elements from my original cluster, just for getting the size. Attached you can find a LV8.5 version, the behaviour in LV 2010 SP1 is exactly the same. cast_fails4.vi thx tnt