problem with translate c++ to vb.net

hi
I have some code in c++ an I wish translate this to vb.net

my first problem:
I have this code

Code:

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typedef prInt32        prProgressSts;

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in c++.
I don't know how can i translate this to vb.net because this is a data type and use in

Code:

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prProgressSts lStatus;

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.
I translate that but second line have error

Code:

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Public prProgressSts As Integer

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Code:

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Dim lStatus As prProgressSts

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my second problem:
please translate this code for me. I don't know that what is "gen" in this code.

Code:

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#define prSUB_GENERATION_CAMERA(gen)        ((gen&prGENERATION_CAMERA_MASK)>>8)

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very thanks