Can't call methods of classes.

Can't call methods of classes.
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Hi everyone, my name’s Justin, I’m new here.

I have more than one question, but this is the most important one.
For some reason when I create an instance of a class, I can’t seem to call any of its methods! I keep getting this error :
LNK2019: unresolved external symbol "public: — and then it goes on to tell me the method name and where it was called from. It’s really bugging me. The errors are only at runtime.
Any help would be so much appreciated.

Ok, the other two minor questions are :

  1. If I create a derived class, will it inherit static functions and use them as its own?
  2. Is there a better way to get keyboard input in windows other than GetKeyState() ?