DoneMemPack
int __stdcall DoneMemPack (int hMemPack);
Description of fields:
Return value: DoneMemPack should return zero if successful, or one of the error codes otherwise.
hMemPack is the handle returned by StartMemPack.
It may be called in two different cases:
1. The packing functions have completed successfully, or
2. The user has aborted the packing operation.
The plugin should free all data allocated when packing.