Memory leak coming from COleSafeArray object - C / C++ / MFC Discussion Boards

Re: will someone look here.................................................................................

yang__lee4-May-06 0:37

4-May-06 0:37

Cedric,

In another words,
map mode = MM_TEXT
View origin=0,0(top left)
first line drawn (10,10-------- 20,10)

I scroll view ..with scroll bars and bring the view to an doc area where first line is not visible.

second vertical line drawn .. say (15,200----15,210)

but for second line its taking coordinates as (15, 20----15,30)

its not adding origin + scroll range to the points

what can be the reason.

Leya

Re: will someone look here.................................................................................

Cedric Moonen4-May-06 0:54

Cedric Moonen

4-May-06 0:54

You didn't answer my question: is everything drawn in OnPaint ?
Post the code of your OnPaint handler (use the pre tags to format it properly).

Re: will someone look here.................................................................................

Cedric Moonen4-May-06 1:28

Cedric Moonen

4-May-06 1:28

rectLs = ls->GetBoundingRect();		
//pDC->LPtoDP(&rectLs);		
pDC->DPtoLP(&rectLs);		
rectLs.InflateRect(1, 1);

This is useless because it doesn't have any impact on the drawing (drawing is made in DrawLineString).
But, your didn't show your drawing code. Post the DrawLineString function (and everything that is related to the drawing of the line.
I suppose CLineString is one of your class ?

Re: will someone look here.................................................................................

Cedric Moonen4-May-06 1:49

Cedric Moonen

4-May-06 1:49

By rereading your previous post I think the problem is in fact not a drawing problem but how you save the point ! The problem is that in the point you get in the OnLButtonDown doesn't take in account the scroll positions (that's logical) but only the client coordinates !
Thus, you need to add the coordinates of your scroll bar to the point. I suppose your view class derives from CScrollView ?
Then, you can retrieve the position of the scrollbar by calling GetScrollPosition.
Then, you need to add the X an Y from the scroll position to the point received in OnLButtonDown.

Re: will someone look here.................................................................................

yang__lee4-May-06 2:40

yang__lee

4-May-06 2:40

Thanks Cedric,
Atlast you understood. Smile | :)

I wonder how I can improve my english communication?

thanks,

Leya

Re: will someone look here.................................................................................

Cedric Moonen4-May-06 3:10

Cedric Moonen

4-May-06 3:10

Maybe by practising more Wink | ;)

. It is like programming, it takes time to be fluent with.
Anyway, does that solve your problem ?

How do I change the menubar's background ?

Happy frog3-May-06 22:34

Happy frog

3-May-06 22:34

How do I change the menubar's background to show a tiled bitmap or to show in come color else?

I'd like to display a bitmap as the menubar( not menu item) background..

Can any 1 show me the way ?

Deeply appricate your help... Big Grin | :-D

Memory leak coming from COleSafeArray object

lastgen3-May-06 22:31

lastgen

3-May-06 22:31

I must be missing something in the cleanup, but here is a cut version of the code that causes the leak.

<br />
// ... an Excel file has been loaded already into oSheet<br />
CExcelRange usedCells = oSheet.get_UsedRange();<br />
<br />
// Copy used cells to array - It is this line of code that causes the leak<br />
/****************************************************/<br />
COleSafeArray cellArray(usedCells.get_Value());<br />
/****************************************************/<br />
<br />
usedCells.Clear();<br />
usedCells.ReleaseDispatch();<br />
VariantClear(cellArray);<br />
cellArray.Clear();<br />
cellArray.Detach();<br />
// ...close down excel etc etc<br />

I have deliberately cut down my code for testing so it essentially does nothing but load the file. There is no code between "COleSafeArray cellArray(usedCells.get_Value());" and "usedCells.Clear();" to help narrow down the leak.
If I comment out the line "COleSafeArray cellArray(usedCells.get_Value());" (and oviously the associated cleanup so it will compile) I have no leak, but if it calls this line I get an immediate loss of ~4-5 times the file size which equates to about 30 meg per file. If I run this multiple times it continues to drop, so I don't think it is a windows caching problem. Anybody know what I'm missing?

When I die I'd like to go peacefully in my sleep like my father, not screaming in terror like his passengers!!!

Re: Memory leak coming from COleSafeArray object

lastgen3-May-06 23:33

lastgen

3-May-06 23:33

OK I've worked it out. It seems you cannot set the data via the constructor or it will cause a leak, don't ask me why, it just does. Otherwise it works fine. The fix is to replace the faulty line with these two

COleSafeArray cellArray;
cellArray.Attach(usedCells.get_Value());

I have also noticed with this fussing today that if a value is assigned to any form of variant based objects in C++ it will leak unless you call Clear() after every assignment. One of the many reasons why I despise variants.

When I die I'd like to go peacefully in my sleep like my father, not screaming in terror like his passengers!!!

verify Windows Firewall settings

QuickDeveloper3-May-06 22:23

QuickDeveloper

3-May-06 22:23

hi

1)I want to Verify Windows Firewall Settings in VC or VB(since API functions can be used in both).
2)Verify DCOM Privileges to run DCOM based applications

can anyone point to some links or atleast give an idea abt the kind of functions to look for? Smile | :)

thanx in advance

"Every morning I go through Forbes list of 40 richest people in the world. If my name is not in there, I go to work..!!!"

-- modified at 4:23 Thursday 4th May, 2006

why dose this happen in class wizard of vc++ 6.0

ewighell3-May-06 22:10

ewighell

3-May-06 22:10

I delete a class in the vc++ 6.0 by removing the .h and .cpp file from project and then deleting them from the disk folder.

But when I want to create a class with the same name as I deleted just now, an error message box pops up say something like "the class ... is in use, please specify another name...".

even restarting the visual c++ program does not make any help.

why dose this happen, and how to fix it?

Thank you very much!!!

-------------------
I am learning C++ and English

-- modified at 4:10 Thursday 4th May, 2006

Re: why dose this happen in class wizard of vc++ 6.0

Monty²3-May-06 22:13

Monty²

3-May-06 22:13

Try deleting the .clw file and when you open classwizard again specify all files, should fix it.

Master.. Master.. where are the dreams that i've been after...

Adding Documents to F1

parichaybp3-May-06 21:53

parichaybp

3-May-06 21:53

Hi,

I have newly created MFC 32 Application, can any one please tell how to add Help [F1] documents and images to project.

Regards,
Parichay.

Adding Documents to F1

kk.tvm3-May-06 23:06

kk.tvm

3-May-06 23:06

Hi
Please use Accelerator in Resource

by

KK

Re: Adding Documents to F1

parichaybp3-May-06 23:10

parichaybp

3-May-06 23:10

Hi,
Thanks for the msg,

Can u please expand and tell what i have to do..
i am new to VC++.

Re: Adding Documents to F1

parichaybp3-May-06 23:12

parichaybp

3-May-06 23:12

hi,

Thank for the msg,

can u please expand and tell me what i have to do. i am new to VC++.

Re: Adding Documents to F1

Maxwell Chen3-May-06 23:14

Maxwell Chen

3-May-06 23:14

Please read "Authoring Help Topics" in MSDN[^] and the related pages found in the content tree at left side.

Maxwell Chen

Special folders on remote machine

Mila0253-May-06 21:46

Mila025

3-May-06 21:46

Hi,

Is there any way to get paths to special folders like "Program Files"
or "Common Files" but on remote machine ?

I need to get path to Program Files folder - I can use RegConnectRegistry and read out from there but it doesn't work i.e. on WinXP Home Ed.

-----------
Mila

finding Audio Level

atimpoo3-May-06 21:17

atimpoo

3-May-06 21:17

Hi All,

Can anyone know how to find the audio level from the microphone? Basically I want to splitup the audio level from no audio(if the person is silent) to very high level... How can i get the frequency??

Thanks,
Poornima

Re: finding Audio Level

Nishad S3-May-06 21:26

Nishad S

3-May-06 21:26

Have a look at http://www.codeproject.com/audio/waveInFFT.asp[^]

- NS -

Re: finding Audio Level

Remco Hoogenboezem3-May-06 21:43

Remco Hoogenboezem

3-May-06 21:43

Hello Poornima,

You could also try the FFTW subroutine library. The functions are easy to use and
competitive with vendor tuned code. Smile | :)

http://www.fftw.org/

Re: finding Audio Level

atimpoo3-May-06 23:34

atimpoo

3-May-06 23:34

Thanks a lot for the guidance. Smile | :)

Re: finding Audio Level

normanS4-May-06 19:51

normanS

4-May-06 19:51

What do you want - audio level (volume) or audio tone (frequency) or both?

FFT will give you frequency and a volume-related value at each frequency.

If you want only volume, you could calculate an average peak-to-peak value for some period as an estimate.

Re: finding Audio Level

atimpoo5-May-06 0:00

atimpoo

5-May-06 0:00

Hey,

I dont understand your question... Frown | :(

Frequncy and volume are interelated rite... I mean frequency directly proportional to audio ???

do clear me If i am wrong.

Re: finding Audio Level

normanS7-May-06 19:19

normanS

7-May-06 19:19

Volume is how loud the sound is (a soft sound, like someone wispering, has low volume, a loud sound, like a fighter aircraft engine, has high volume.)

Frequency is the pitch or tone of a sound - a double bass plays notes which have a low frequency (a low cycle per second or Herz value) while a penny whistle plays notes which have a high frequency.

The frequency and the volume of a sound are not really related, although human perception does come into it.

The normal PC software volume control only controls volume, it does not affect frequency.

From your original question, I think you were trying to decide whether a sound was soft or loud, i.e. volume. My point was that you should be able to determine this in a simpler way than doing an FFT.

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