C / C++ / MFC

2-Jan-09 20:05

Hi all,

I have a Rect,

e.g:

CRect rect=CRect(10,20,20,40);

i have new width for rect like 80.

now how can i create rect with this width and other values are remains same.

please help me for this.

thanks in advance.

IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH

Hamid_RT2-Jan-09 20:27

2-Jan-09 20:27

I think you can use of CRect::DeflateRect.

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Le@rner2-Jan-09 20:47

2-Jan-09 20:47

Hamid. wrote:
CRect::DeflateRect.

but this use for Decreases the width and height of CRect.

IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH

Hamid_RT3-Jan-09 0:16

3-Jan-09 0:16

You can decrease your width of current width with this function.

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

CPallini2-Jan-09 20:50

CPallini

2-Jan-09 20:50

rect.InflateRect(0,0,70,0);

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-- Alfonso the Wise, 13th Century King of Castile.

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Le@rner2-Jan-09 20:55

2-Jan-09 20:55

please explain why this.

IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH

CPallini2-Jan-09 21:04

CPallini

2-Jan-09 21:04

Your original rect (10,20,20,40) has

width = right - left = 20 - 10 = 10 pixels.

If you want it 80 pixels wide (with minimum change on coordinates) then you should move its right side 70 pixels to the right:

left<sub>new</sub>   = left;
right<sub>new</sub>  = right + 70; // now width = right<sub>new</sub> - left<sub>new</sub> = 80
top<sub>new</sub>    = top;
bottom<sub>new</sub> = bottom;

That's what InflateRect(0,0,70,0) does.
Smile | :)

Le@rner2-Jan-09 21:16

2-Jan-09 21:16

thanks ,
if new width is decrease so i can use DeflateRect or InflateRect.

IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH

CPallini3-Jan-09 2:49

CPallini

3-Jan-09 2:49

You may also use inflate with negative values.
Smile | :)

Releasing memory occupied by controls

Michael Dunn3-Jan-09 18:41

Michael Dunn

3-Jan-09 18:41

Juat assign a new value to the right member:

rect.right = rect.left + the_new_width;

--Mike--
Visual C++ MVP Cool | :cool:

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VCProgrammer2-Jan-09 19:06

VCProgrammer

2-Jan-09 19:06

Hi all,

I have made a Dialog box in vc2008 and have made several control on it....

at end i want to release memory occupied by all the controls...

How can i do this??

Thanks in advance

Re: Releasing memory occupied by controls [modified]

Le@rner2-Jan-09 19:33

Re: Releasing memory occupied by controls

2-Jan-09 19:33

Check this article.

http://www.codeproject.com/script/Forums/View.aspx?fid=1647&msg=2689443[^]

http://www.codeproject.com/script/Forums/Search.aspx?fid=0&kw=Releasing+memory&sf_fi=1647&sf_sw=2&pgnum=1[^]

IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH

modified on Saturday, January 3, 2009 1:39 AM

Hamid_RT2-Jan-09 19:55

Re: Releasing memory occupied by controls

2-Jan-09 19:55

How did you make them?

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Randor 3-Jan-09 0:34

Randor

3-Jan-09 0:34

Although your instincts may tell you otherwise, this is not how memory management[^] works. Your application has an internel working set[^] of memory. The operating system uses this extra memory to make your application faster since the memory is already allocated but simply marked as "stand-by". When you free your memory it does not mean your working set will decrease in size. The memory is simply marked as "not needed now, but maybe later" or "standby". I hope this makes sense.

It is possible to force all standby memory to be released by calling the SetProcessWorkingSetSize Function[^] with -1 for both arguments although its not recommended. It required the PROCESS_SET_QUOTA access right. You can severly harm application performance by abusing SetProcessWorkingSetSize. Note that this technique is not recommended for most applications.

Best Wishes,
-David Delaune

Need help for coloring the CTabCtrl white

Rahul Vaishnav2-Jan-09 18:17

Rahul Vaishnav

2-Jan-09 18:17

Hi all,

I need help for coloring the CTabCtrl Window to white in MFC.

Actually I have a Tab control having Two tabs,I have not added Property pages, just put some controls like Edit box and Radio buttons on Tab control and on click of Each tab I am just hiding and showing some controls.
I want to make Tab control color white..
Please give me some sample code or some link for help..

Thanks in advance

Re: Need help for coloring the CTabCtrl white

Hamid_RT2-Jan-09 19:58

2-Jan-09 19:58

Is Ownerdraw Tab Controls - Borders and All[^] helpful?

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

virtual operator "="

wubousc2-Jan-09 13:21

wubousc

2-Jan-09 13:21

Hi,

I wonder why a derived class can not use its base class's virtual operator = function. For example, code like this can not pass compilation:

#include <iostream>

using namespace std;

class base
{
public:

virtual base & operator = (const base &other) {}

};

class derived : public base
{

};

int main()
{
derived d;
base b;

d = b; //compiler says no operator = found

return 0;
}

thanks,
Bob

Bram van Kampen2-Jan-09 14:56

Bram van Kampen

2-Jan-09 14:56

Just a Casting Problem

Try Again As Follows:

(base)d = b;

Regards,

Smile | :)

Bram van Kampen

wubousc2-Jan-09 15:46

wubousc

2-Jan-09 15:46

yes, typecast works. But what I mean is why derived can not directly use "=" if it inherits it from base?

thanks,
Bob

Mark Salsbery2-Jan-09 16:55

Mark Salsbery

2-Jan-09 16:55

The assignment operator used is chosen based on the
type of the variable being assigned to. To use the base
assignment operator without a cast would require an overload
that returns a derived.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

wubousc2-Jan-09 17:03

wubousc

2-Jan-09 17:03

Is it in the specification of C++? If not, what I can see is the derived class inherits all of the information of the function in the bass class, including the return value.

thanks,
Bob