At the time of MFC interface program, in the events button pretreatment procedure, I need to call the drawing function library MathGL class, but in ClickedButton () function inside added MathGL class definition, procedure in the case of without any error, can't pop-up Windows interface, the program has been running, this is what problem cause?
For in ClickedButton1 () call other internal library function class, general need how to deal with?