I want to dill with the uparrow down message, I tried to use OnKeyDown and OnSysKeyDown ,but when the user pressed the uparrow both of the two function is not called ,why? please help me! thanks a lot!

you can compile the exe file with the dll static linked,you just need to open the settings of the project then change the link options to WITH MFC STATIC LINKED ,compile it ,that is ok!