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lockrect() in d3d8

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i''ve done this already and it seems to work:
  

D3DLOCKED_RECT scr[640*480]; // is this right?

screen->LockRect( scr, NULL, NULL ); // returns D3D_OK


// here i would like to read and modify scr[].


screen->UnlockRect();

  
so how can i read "void* pBits" from scr? i don''t understand these void-thingies... i''ve tried to do something myself, but everytime i get only zeros or some random numbers.

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