Ask a rookie driver development issues

Read some books Mac OX / iOS-driven development with the use of the C + + IO Kit would like to ask, is not driven development provides complete C + + interface to do, and that the upper layer software are used obj-C how to call driver interface? Thank you
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Their top. . .
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You can mixed ah.
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reference to the second floor of the reply:

you can mixed ah.

Oh, I just saw yesterday, Oh, thanks