opening dll files

Question

can somebody tell me how to view function definitions inside a dll of some exe program.
PS: I already jetbrains.dotpeek (didn't work) ; pe.explorer showed the function names, but not their definitions.

Answer 1

You can not view function definitions inside c++ dll because c++ ddls and exes are compiled into low level machine code.

Answer 2

there seems to be some way: see I'll explain my problem; I have 2 devices "a linear stage " and " a spectrometer" . I have softwares (exe files) for both of them, but my professor wants me to write customized programs for them; I have been able to do that for the "linear stage" with the help of GitHub , I need to do the same for spectrometer (not present on Git) .... now the person on github has been able do that with the dlls of linear stage so there must be some way; in fact i have decompiled the dlls of spectrometer and i can see the function names; but not their definitions!