Dll with functions in a class. How do I get access these functions for my c++ program?

To describe my scenario, I have a dll that contains the class CLS_WMApp which includes all of the functions that I need to use. I also do not have the source code so many resources that have said to create my own interface with virtual functions prove to not work.

i.e. - class CLS_WMApp :public MyInterface

I plan on linking explicitly but it can not retrieve the functions for the reason of there being a class within the dll. 

When I use LoadLibrary() it does return a handle, but when I call GetProcAddress() it gives me the error 126, which is "specified module could not be found"

Any suggestions on getting access to these functions is much appreciated!