Translate this from C to VB ?

Can anyone translate this bunch of C into VB?

I'm having some difficulties.....

***************************
NotifyCallbackHandler((struct NotifyCallbackRecord *)lParam);
***************************

I know this calls a function "NotifyCallbackHandler",
but what is the VB equivalent of:
(struct NotifyCallbackRecord *)lParam);

I already have a Type def as the VB version of Struct, and it's created to match the C struct.

I've tried this:
RtlMoveMemory pCallBackRecord, lParam, LenB(pCallBackRecord)

Any help?

Not here...