Re: how to organize several class and their instance in windows programming

David Wilkinson <>
Fri, 23 May 2008 08:44:09 -0400
asm23 wrote:

Hi, everyone, I'm designing a project which could do some image
processing, motion control and networking using MFC.

nowadays I'm puzzled how to organize so many class and their instances.
Though I think the "design pattern" could solve my problem, but what I
only want is to get a simple method or a belief understand.

suppose these class are like this:

CImageProc (class deal with image processing)
CMotionControl (class deal with motion control)
CNetwork (class deal with networking)
CXXXClass (class doing other work)

This is the way I use, in the CMainFrame( I'm using SDI based MFC
project), I add all these class as it's member variable. so, things can
look like this.

class CMainFrame : public CFrameWnd{
    CImageProc m_image;
    CMotionControl m_motor;
    CNetwork m_socket;
    CXXXClass m_myxxx;

So, I'm confused that how does these members communicate with each
other. For example, After Image processing, I would like to do some
motion control...

So, some member function of CMotionControl should be called in
CImageProc like below:

    //the next line is what I want to do or something like that
    m_motor.move(..);//This is just a pseudo code
But As we know, CImageProc could not access CMotionControl class
directly, So, It should Add a Pointer to CMotionControl As it's member.
class CImageProc{
    CMotionControl *m_pMotor;

You can imagine that things become more complicated while all these
Classes will Call other class's function. Each Class should maintain
several Pointers pointing to other classes.

I thinks this is what my puzzle come from and I can't find the way to
solve it. Especially When the Objects or instances number becomes larger
and larger...


I think I would just pass a pointer parameter to the methods that need it:

CImageProc::Processing(CMotionControl *pMotor)

David Wilkinson
Visual C++ MVP

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