SOS BC45 DLL'S and Delphi

I have a problem .
I need to use BC4.5 DLL's whith Delphi as the main Programs.
I would  realy aprishate if some one could tell me (or send a sort
example) .
in BC45 the function statment should be somthing like this:
int test(int a,int b,intc);
delphi should send in a,b,c input , BC45 should prossess the number
and return a anser in a,b,c, and in test.
I tred all most evry thing and it dosen't work,
Thenck's