encryption - Convert Outlook Object Model MailItemPtr to MAPI IMessage in c++ -

requirement: need create dll decrypts email in outlook using mapidefs in c++. our product team pass imessage dll , need decrypt , pass decrypted email in form of imessage output. dll execute in different client machines.

but failed decrypt using mapidefs , tried using oom , successfull. oom program takes , returns mailitemptr output. need convert mailitemptr imessage. tried many ways not achieve it.

question: need in converting mailitemptr mapi imessage , viceversa

thanks help

read mailitem.mapiobject property - returns imessage mapi object.