Better Description of the Problem: - C / C++ / MFC Discussion Boards

Re: Will the following code cause memory leakage?

wb2-Aug-04 6:19

2-Aug-04 6:19

of course, this CAN'T make a memory leak. the strings are alocated on the stac and cleared automaticly.

Re: Will the following code cause memory leakage?

palbano2-Aug-04 7:43

palbano

2-Aug-04 7:43

thank you

Hopefully vcplusplus is reading Big Grin | :-D

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: Will the following code cause memory leakage?

ting6682-Aug-04 6:23

ting668

2-Aug-04 6:23

it is a dll
cannot be debug

anyway, i believe it will be cause memory leakage as the friendly guys who are replying me ^^.

Not always...

Navin2-Aug-04 6:50

Navin

2-Aug-04 6:50

Visual misses a lot of memory leaks.. especially if they are in a DLL loaded by the process being debugged.

An expert is somebody who learns more and more about less and less, until he knows absolutely everything about nothing.

Re: Will the following code cause memory leakage?

Navin2-Aug-04 6:53

Navin

2-Aug-04 6:53

As written, it will not be a memory leak. String literals are more like constants - not dynamically allocated memory.

General rule: if you allocate memory with "new" (or "malloc" for old-school C code), and do not deallocate it with "delete" (or "free" for old-school C code), you will get a memory leak. Otherwise, the memory will be allocated on the stack and you won't get a memory leak.

There is an emperical way to try it... take the code you have written, and put it in an infinite loop. Do no optimisations. Run it for a while, and see if your memory usage slowly and gradually goes up in Task Manager. If it then goes back down when you quit the program, then you have a memory leak. Smile | :)

An expert is somebody who learns more and more about less and less, until he knows absolutely everything about nothing.

Downcasting?

0v3rloader2-Aug-04 5:35

0v3rloader

2-Aug-04 5:35

Hello,

I have some Edit controls layed out on a dialog, which are created automatically when the dialog loads up. Now I have a class which is derived from CEdit and I need to subclass it from the precreated Edit controls. I've tried subclassing them but all I got was message (AND NOT COMMAND) notification through DefWindowProc.

My question is: do I have to downcast it? And if so, how do I do that?

Re: Downcasting?

palbano2-Aug-04 5:58

palbano

2-Aug-04 5:58

dNimrod#X wrote:
My question is: do I have to downcast it?

My guess would be no, that you have problems elsewhere. I am only guessing because i don't completely understand your post.

For instance:

dNimrod#X wrote:
which are created automatically when the dialog loads up

I don't know what you mean by that or this either:

dNimrod#X wrote:
I need to subclass it from the precreated Edit controls

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Better Description of the Problem:

0v3rloader2-Aug-04 6:13

0v3rloader

2-Aug-04 6:13

I have some CEdit controls layed out on a dialog template resource. They are created automatically when the dialog box is (dynamically) created.

What I need to do is force my CEdit-derived class to attach itself to the already created control(s).

Consider this:

class CMyEdit : public CEdit
{
protected:
	virtual LRESULT DefWindowProc(...);
	.
	:
	.
};

Example of implementation:

int CMyDialog::OnInitDialog()
{
	CMyEdit *pEdit;

	pEdit = new CMyEdit;
	pEdit -> SubclassDlgItem(IDC_VAL, this);	// not enough!
	.
	:
	.
}

Subclassing seems to not solve my problem because, although I still receive OnPaint, ... notifications, I can't seem to receive the EN_CHANGE command nor the WM_UNDO, to just name a few.

How do I do about solving this?

Re: Better Description of the Problem:

alex.barylski2-Aug-04 7:11

alex.barylski

2-Aug-04 7:11

If I understand your problem correctly, you won't need to downcast.

All you need to do in order for MFC to automatically subclass your edit control for you is:

1) Right click on edit control
2) Select class wizard
3) Click "Member variables" tab
4) Find control ID for edit control you wish to subclass
5) Double click on it
6) Under category pick control
7) fill in details as required and if your edit control isn't available and only a generic CEdit is displayed you can:

I believe remove your *.clw file and regenerate it when VC as you to selecting all your project files (including CEdit derived (h and cpp files).

OR

Go with a generic CEdit and later just modify it changing it to CPhoneEdit (or whatever)

Cheers Smile | :)

How do I print my voice mail?

Re: Better Description of the Problem:

palbano2-Aug-04 7:46

palbano

2-Aug-04 7:46

Thanks

I just didn't have it in me on a Monday morning to type all that up. Beer | [beer]

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: Better Description of the Problem:

palbano2-Aug-04 8:02

palbano

2-Aug-04 8:02

Hockey wrote:
How do I print my voice mail?

Easy, blow it out your arse Laugh | :laugh:

Sorry if that is a repost Poke tongue | ;-P

"No matter where you go, there your are." - Buckaroo Banzai

-pete

CAN'T use ClassWizard!! Code is located in a Static Library.

0v3rloader2-Aug-04 8:33

0v3rloader

2-Aug-04 8:33

Hi there! and thanks for your reply.

I am sorry but I can't use ClassWizard as I am using a Static Lib.
In this case, what is my best option?

As a mentioned earlier, I tryied Subclassing the control and all I could get from it was receiving [generic] message notification from CWnd, but NOT command notifications from CEdit (like EN_CHANGE; WM_UNDO; ...).

Furthermore and to provide you with some more info on the question, I have derived a class (lets call it CMyEdit) from CEdit.

What I would really like to know is the steps I have to take in order to fully "subclass" the control?

Thanks again for the reply.

David

By the way:

Quote (from Hockey):
How do I print my voice mail?

That's simple, I guess! Record your voice mail using any WaveEditor and simply print out the graph it generates!!

Re: CAN'T use ClassWizard!! Code is located in a Static Library.

alex.barylski2-Aug-04 18:47

alex.barylski

2-Aug-04 18:47

dNimrod#X wrote:
I am sorry but I can't use ClassWizard as I am using a Static Lib.

I'm not sure I understand why this is creating a problem Confused | :confused:

When you derive an class using from CEdit using classwizard it automatically subclasses CEdit for you. You can then use VS to add and remove message handlers as required.

Did you derive your class from CEdit manually???

I can't remember how you said you subclassed your control...and i'm too lazy to go look...

I don't think SubclassWindow() is the way you want to do it...you'd probably have better luck using SetWindowLong replacing the original window procedure all togather.

Cheers Smile | :)

How do I print my voice mail?

Re: CAN'T use ClassWizard!! Code is located in a Static Library.

0v3rloader3-Aug-04 2:03

0v3rloader

3-Aug-04 2:03

PJ Arends has given me the information I needed!
I was Subclassing the control well, no problem with that. The problem was that the notifications I needed to receive (EN_CHANGE; EN_UPDATE; and others) were being sent to the parent window thus not being routed in to my derived class. And in this case, I have to use message reflection techniques in order for my CEdit-derived class to be notified.

One of Windows' many oddities, I guess.

Anyway, thanks for the replies. Smile | :)

David

CView VSCROLL intro

birdman632-Aug-04 5:27

birdman63

2-Aug-04 5:27

Hi,

I have an SDI application with a CView client area containing some text and lines.

I'd like to add simple, standard, vertical scrolling and I thought I'd get that by OR-ing in the WS_VSCROLL style. That made the vertical scroll bar appear but it did not make it operational.

Please may I have a few kick-start clues or a link to a tutorial/intro for the actual coding of a vertical scroll utility.

Thanks in advance.

Re: CView VSCROLL intro

alex.barylski2-Aug-04 7:13

alex.barylski

2-Aug-04 7:13

Check out CScrollView Smile | :)

How do I print my voice mail?

tpkt paquets

argali2-Aug-04 4:45

argali

2-Aug-04 4:45

Hi,

I'm implementing a TCP server that should delimit tpkt paquets on a TCP stream, change their headers and resend them. I don't know how to catch each paquet and how to know his length. Anybody has a code or an example that shows how to delimit paquets on a TCP stream ?

Thank you

Imad

Win socket & Dialog boxes

pork chop2-Aug-04 4:43

pork chop

2-Aug-04 4:43

hi! i've created a dialog based MFC program..now i need to add just 1 additional feature to complete the proj..

is there anyway i can set up the user interface on multiple users, and when 1 user enter text input to the user interface, he can just press a button & send the text over to the a chosen user?

it's something like a msn/icq that i'm thinking of implementing...

Re: Win socket & Dialog boxes

palbano2-Aug-04 6:04

palbano

2-Aug-04 6:04

pork chop wrote:
is there anyway i can set up the user interface on multiple users

Confused | :confused:

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Windows Startup

Ayman Mahmoud2-Aug-04 4:39

Ayman Mahmoud

2-Aug-04 4:39

Hi,
I want to add something so that my dll is called with the windows startup. I don't want to use the default registry entries under the HKEY_LOCAL_MACHINE & HKEY_CURRENT_USER.
Thanks

Re: Windows Startup

Jaime Stuardo2-Aug-04 5:02

Jaime Stuardo

2-Aug-04 5:02

startup menu

Jaime

Re: Windows Startup

David Crow2-Aug-04 8:42

David Crow

2-Aug-04 8:42

amahmoud81 wrote:
I don't want to use the default registry entries under the HKEY_LOCAL_MACHINE & HKEY_CURRENT_USER.

Why?

Don't forget that you'll need an actual application (e.g., rundll32.exe) to start your DLL.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Dundas Grid question.

Maximilien2-Aug-04 4:32

Maximilien

2-Aug-04 4:32

(also sent to Dundas Tech this morning; but maybe some other CPian already tried that )

I have a grid ( row selection ) with multiple columns, one is a checkbox cell type; I select a range of cells and when clicking on one checkbox in the selected range, I want to update all checkbox cells with the state of that one cell.

I was wondering if it's possible to select a range of checkbox cells (CUGCheckBoxType) , and click on the checkbox to affect all the selected cells ?

now, in the CUGGrid::OnLButtonDown method, there's m_ctrl->GotoCell(col,row) that resets the selection.

Seems that I have to "hack" a couple of methods here and there to achieve what I want, and I don't really want to do it, and mess with the Dundas code.

I could use a contextual menu to do it, but it seems unelegant ... and not what Boss wants... Cry | :((

Thanks.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Dundas Grid question.

Peter Zajac3-Aug-04 10:04

Peter Zajac

3-Aug-04 10:04

Please try the recommendations Dundas Support has emailed to you earlier today and let us know if it something you can use.

Peter Zajac
Dundas Software

Modal listbox

navratil2-Aug-04 4:14

navratil

2-Aug-04 4:14

Hello, I've tried to do modal listbox like the member list in VisualStudio. I used class CDialog with listbox (without border and caption). But there is a terrible BEEP when mouse is clicked outside the dialog. I can't find the mechanism which do the BEEP. Do you have any idea how to do that. Thanks. D'Oh! | :doh:

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