Help with no default constructor message

[ForNow]

Richard, Richard Andrew X64 got me pointed in the right direction For the Class Declaration KeyStroke mykeys; inside class Cprogedit : public CrichEditctrl this was the necessary constructer

CProgedit::CProgedit(int numlines, CProgedit* editptr) : mykeys(numlines, editptr)

[Richard Andrew x64]

I'm glad you got it fixed. :)

The difficult we do right away... ...the impossible takes slightly longer.

[ForNow]

KeyStroke mykey; defined in Cprogedit.h

CProgedit::CProgedit(int numlines, CProgedit* editptr) : mykey(numlines, editptr)

KeyStroke::KeyStroke(int numlines, CRichEditCtrl* editptr)

Cprogedit* myrich = new Cprogedit((int) 30, myrich); DO you think this will work. What I mean is the two parameters are being passed to KeyStroke but will myrich have a vaule before KeyStroke constructor is called

[Richard Andrew x64]

I think that will definitely not work. Because it passes an uninitialized value into the constructor before it returns the new pointer. ;)

The difficult we do right away... ...the impossible takes slightly longer.

[ForNow]

Is there any way this is do-able What I mean by that is I am sure you know MFC internals better than me does get the storage for the Object class BEFORE it calls one or all of the member classes/object in the class For some reason I thought that it did

[Richard Andrew x64]

I don't know what to tell you because you need to explain what you are trying to accomplish. If we can talk about what you want to accomplish, then we can probably find a solution. Why do you think you need to do it this way?

The difficult we do right away... ...the impossible takes slightly longer.

[ForNow]

I wrote a number of rich edit classes after finishing I realized they would all have common functionality 1) processing KeyStrokes 2) cursor select 3) Finding data I decided to encompass all of this in a class called KeyStroke which would expand functioality on a EditCtrl object so I declared KeyStroke mykey1; etc; 2 3 ... The constructor of KeyStroke takes a RicheditObject it was my understanding that when "new" build a class/object the First thing it does is allocate storage for the class/object and then call member classes which is why I thought this was doable Thanks

[Richard Andrew x64]

If you do,

CObject* ptr = new CObject();

It performs that in two steps: 1. Calls the CObject constructor 2. Then it assigns the instance to the ptr ptr is uninititalized when the CObject constructor is called. It's not initialized until after the constructor returns. It might allocate the memory for ptr before it calls the constructor, but it does not contain a useful value. It's uninitialized until the assignment occurs.

The difficult we do right away... ...the impossible takes slightly longer.

[ForNow]

Thanks I think the only other way I Might ? be able to do what I want is use the "this" pointer Assuming that KeyStroke is a Abstract Object used within the context of Cricheditctrl The this pointer would be that of the CRicheditctrl I can set a breakpoint inside the KeyStroke constructer check the "this" value and check "myrich =" pointer afterwards to see if they are the same value otherwise I guess I would set the richedit ptr after I allocate the object thanks

[ForNow]

In the KeyStroke Contructor I cast a "this" pointer to CRicheditctrl * and I wrote down the address I then observed Cricheditctrl pointer assigned after the new and it was the same address i'll cut and paste the code for more clarity

KeyStroke::KeyStroke(int numlines, CRichEditCtrl* editptr)
{
max_line = numlines;
edit_ptr = editptr;
edit_ptr = (CRichEditCtrl*)this;
}

myedit = new CProgedit((int)30,myedit); // allocate the richedit

[Jochen Arndt]

A common solution to add such functionality is adding a KeyStroke member to your Rich Edit derived class and pass the this pointer to the member:

class MyRich public CRichEditCtrl
{
public:
MyRichyRich(int numlines);
KeyStroke m_KeyStroke;
};

MyRich::MyRich(int numlines) :
m_KeyStroke(numlines, this)
{
}

But this will generate a C4355 warning. To avoid that, you can make the KeyStroke member a pointer and allocate it in the constructor:

MyRich::MyRich(int numlines)
{
m_pKeyStroke = new KeyStroke(numlines, this);
}

or provide an initialisation function:

MyRich::MyRich(int numlines)
{
m_KeyStroke.Init(numlines, this);
}

Your problem is not the error message from the subject but that you want to access your Rich Edit object before it is created (and did not use this instead).

[ForNow]

Thanks upon entry to the constructer the "this" pointer is valid Thanks