How to open Media Changer handle

[dashinghawk]

Dear Sir,
I am doing a project on tape drives.
Please let me know how to handle media changer device so that to load different tapes from stacker or media changer into tape drive. i am using 3480 Fujitsu tape drive.
i want to load tapes from changer device or stacker at run time.
i used CreateFile and OpenFile apis to open media changer handle, But could not succeed.
i am using ASPI APIs but dont have any idea how to initilaize tape media changer device and what command to sent it so that it load and unload cartridges tapes into tape drive.
Please give me some programming tips in c++ or VC++, if possible
I will be really thankful of your courtesy and ,kind response.
best regards