Re: memory leak - C / C++ / MFC Discussion Boards

Giulio200022-Jun-06 1:03

Giulio2000

22-Jun-06 1:03

Hello all,

I am sure this is simple to do but I can't find it anywhere.

How do you do mutally exclusive toolbar buttons?
I mean you know the kind of toolbar buttons that when pressed stay pressed and at the same time, deselects all other toolbar buttons in the same grop?

You know in Microsoft Word, you can align you test to the left, center, right or justified. When you press one of those buttons the button stay pressed and also only one of those buttons can be pressed at any given time.

How do you achieve that?

Thanks.

Ciao

Giulio

Re: Toolbar: mutually exclusive buttons

Viorel.22-Jun-06 2:06

Viorel.

22-Jun-06 2:06

I think you have to deal with button styles.

In your OnCreate handler for main frame, you can add a fragment like this:

mMyToolbar.SetButtonStyle(mMyToolbar.CommandToIndex(ID_BUTTON_1), TBBS_CHECKGROUP);
mMyToolbar.SetButtonStyle(mMyToolbar.CommandToIndex(ID_BUTTON_2), TBBS_CHECKGROUP);
mMyToolbar.SetButtonStyle(mMyToolbar.CommandToIndex(ID_BUTTON_3), TBBS_CHECKGROUP);

In this case three buttons will act like radio-buttons.

In addition, in order to make the buttons enabled, you have to provide event handlers for them.

See also: http://www2.cs.uregina.ca/~peckham/cs230b/source/Myword/toolbar.htm[^].

string (replace)-newbie

antonaras22-Jun-06 1:03

antonaras

22-Jun-06 1:03

Hi again guys

i have this simple question

i have a string that holds some text

string text;

i want to search the string and replace any ("&nbs" with a space)

if i use the string.replace("&nbs"," ") it doesn't work what else do i need to specify for the function to work?

Any other ways to do it?
Thanks a lot

Re: string (replace)-newbie

C^hris L^osinger22-Jun-06 1:22

C^hris L^osinger

22-Jun-06 1:22

something like this:

find the first "&nbs"
copy the left part of the string (ie. before the &nbs) to a temp string
add a " " to the temp
in a loop:
find the next "&nbs" in the remaining (right side) string
if none found, add the remaing string to temp, and return temp
add the left part to the temp
add a " " to the temp
repeat the loop

Cleek | Image Toolkits | Thumbnail maker

Re: string (replace)-newbie

antonaras22-Jun-06 1:31

antonaras

22-Jun-06 1:31

Thanks a lot Chris Losinger

good clear steps thanks a lot

Re: string (replace)-newbie

David Crow22-Jun-06 3:24

David Crow

22-Jun-06 3:24

antonaras wrote:

if i use the string.replace("&nbs"," ") it doesn't work

What dosn't work? Does the compiler/linker complain? Is an exception thrown? Do any replacements happen?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

memory leak

Tara1422-Jun-06 0:37

Tara14

22-Jun-06 0:37

What does memory leak mean?

Fortitudine Vinsinues!

Re: memory leak

_AnsHUMAN_ 22-Jun-06 0:45

_AnsHUMAN_

22-Jun-06 0:45

It's unnecessarily using memory when it is no longer needed and we didn't free it or the program doesn't free it.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: memory leak

capricious_00122-Jun-06 0:46

capricious_001

22-Jun-06 0:46

Basically its a bug in a program where memory cant be freed up (in my experience, it happend mostly with dynamically allocated memory cells). The program will continue taking up more and more memory until it eventually crashes:

a)Your computer

b)Your program

c)Your computer (You'll crash your computer into a wall once you realize that a program crashed windows and destroyed the 100 page thesis you were writing and didnt save :P)

Hope that helps

Robbie

Re: memory leak

Tara1422-Jun-06 1:22

Tara14

22-Jun-06 1:22

How does one know that a memory leak is happening? Or how does one find out where the memory keak is taking place?

Fortitudine Vinsinues!

Re: memory leak

_AnsHUMAN_ 22-Jun-06 1:27

_AnsHUMAN_

22-Jun-06 1:27

See Here[^]

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: memory leak

Tara1422-Jun-06 1:59

Tara14

22-Jun-06 1:59

Thank you.

Fortitudine Vinsinues!

Re: memory leak

toxcct22-Jun-06 2:05

toxcct

22-Jun-06 2:05

Visual Leak Detector[^]

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: memory leak

Hamid_RT22-Jun-06 19:41

Hamid_RT

22-Jun-06 19:41

See Memory(-Leak) and Exception Trace (CRT and COM Leaks)[[^] and Visual Leak Detector - Enhanced Memory Leak Detection for Visual C++[^]

whitesky

Re: memory leak

Ryan Binns22-Jun-06 1:26

Ryan Binns

22-Jun-06 1:26

A memory leak is caused when an area of memory no longer has any pointers pointing to it, but it has not been freed. For example:

int *ptr = new int[10];
ptr = new int[5];

The second allocation causes a memory leak, because the memory allocated in the first line cannot be reference, but has not been freed. There is no way you can go back and reference the first memory block, so it has been "leaked".

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Communication between threads

HakunaMatada22-Jun-06 0:22

HakunaMatada

22-Jun-06 0:22

What is the best way to communicate between Threads?

---
With best regards,
A Manchester United Fan

The Genius of a true fool is that he can mess up a foolproof plan!

Re: Communication between threads

toxcct22-Jun-06 0:28

toxcct

22-Jun-06 0:28

threads share the same memory amounts, so there no need to build communication between them (such as pipe, locked tmp files, etc...).

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: Communication between threads

FarPointer22-Jun-06 0:33

FarPointer

22-Jun-06 0:33

PostThreadMessage or SendMessageTimeout according to your ease.

Regards,
FarPointer
Blog:FARPOINTER

Re: Communication between threads

Ryan Binns22-Jun-06 1:28

Ryan Binns

22-Jun-06 1:28

What's the best way to build a house? Wink | ;)

There are many ways, ranging from thread messages (PostThreadMessage etc...) through shared memory, mailslots, pipes and shared variables (with appropriate mutexes/critical sections). Read up on them all and pick the one most suited to your application.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Whether a directory exists

Anil_vvs22-Jun-06 0:11

Anil_vvs

22-Jun-06 0:11

Can anyone tell me how to find out whether a disectory with a given path exits on the local disk or not?

Thanks and Regards,
Anil

Re: Whether a directory exists

Rob Caldecott22-Jun-06 0:14

Rob Caldecott

22-Jun-06 0:14

if (access("c:\\tmp"), 0) != 0)
{
  // c:\tmp doesn't exist
}

Re: Whether a directory exists

toxcct22-Jun-06 0:14

toxcct

22-Jun-06 0:14

PathFileExists()[^] API

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: Whether a directory exists

Code_Zombie22-Jun-06 1:07

Code_Zombie

22-Jun-06 1:07

Try pathisdirectory/getfileattributes apis

Re: Whether a directory exists

Hamid_RT22-Jun-06 19:55

Hamid_RT

22-Jun-06 19:55

See Here[^] maybe it is some helpful to you

whitesky

edit box

amit.code21-Jun-06 23:47

amit.code

21-Jun-06 23:47

i am using a dialog based mfc win app. how can i retrive the value of the edit box in the cpp of another dialog box.

prashant jain malviya national institute of technology

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