Re: add default processing to _all_ charts.

[User (Legacy)]

Francisco Padron wrote in message ... 

>Dear Eric, 

> 

>Very interesting case ! 

> 

>One thing I don't understand though is how are Mouseevents releated to 

>WM_COMMAND ? is it because you were using Chart FX DLL and were capturing 

>the CN_ messages ? 

> 

Yes.... i was doing that in ChartFX 3.0 

>If this is the case, you can use Chart FX 98 DLL and ICfxEvents to achieve 

>the same pourpose. 

> 

I believe that's true, but..... 

>Capturing events through ICfxEvents is fairly simple if you are familiar 

>with COM interfaces. Article Q1381010 (KB) gives you the basics. 

> 

I found this article a while back, but I can't get the thing to work.  What 

I 

thought I needed to do was derive from ICfxEvents, and only override the 

functions I wanted, like so: 

class MyICfxEvents : public ICfxEvents { 

public: 

                        MyICfxEvents (MyState *state); 

STDMETHOD(Fire_LButtonDblClk)(int x,int y,long nSerie,long nPoint); 

private: 

                        MyState *ptr; 

}; 

and then I could implement my constructor (to save my state), and 

implement Fire_LButtonDblClk (or whatever, I actually needed the down, 

up and move), and go. 

When I tried this, I get all sorts of "can't instatiate class due to pure 

virtual 

blah blah blah.   I'm no COM programmer, but I have years of experience 

in C++, so I understand in principal what the error means, but I don't 

want to override ALL the methods, just the ones I want.  Instead of 

learning COM just to do this, I was hoping a for concrete example. 

Thanks, 

Eric.