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Originally Posted by Peace-Maker You shouldn't be using SetPackPosition. It's setting the position of the internal char* stream to some offset. You'd need to calculate the offset yourself which will likely break easily. WritePackCell first "pushes" the size of a cell (4 bytes) on the stream then the cell itself (4 bytes again). So you'd need to set the pack position to 5*8=40. It gets trickier with strings in the pack.. You'd be better off with an adt_trie. SetPackPosition should be deprecated as it's of no practical use.