C / C++ / MFC Discussion Boards

how to use IMultiMediastream ::GetDuration() [modified]

GANsJob15-Jun-06 1:36

15-Jun-06 1:36

Hi,

I have some problem with this fn.
IMultiMediastream::GetDuration(..);
but this fn. worked well
IMultiMediastream::SetState(STREAMSTATE_RUN);
how to solve this problem

-- modified at 8:08 Thursday 15th June, 2006

Memory leaks

Taruni15-Jun-06 1:22

Taruni

15-Jun-06 1:22

Hi,

Is there any tool that can effectively find out the occurances of memory leaks?

Thanks in advance

Taruni

Re: Memory leaks

Hamid_RT15-Jun-06 1:28

Hamid_RT

15-Jun-06 1:28

See Visual Leak Detector - Enhanced Memory Leak Detection for Visual C++
[^] and
Memory(-Leak) and Exception Trace (CRT and COM Leaks)[^]maybe it is some helpful to you

whitesky

Re: Memory leaks

Milton Karimbekallil15-Jun-06 1:34

Milton Karimbekallil

15-Jun-06 1:34

just another tool:

http://www.codeproject.com/tools/visualleakdetector.asp[^]

Re: Memory leaks

toxcct15-Jun-06 2:32

toxcct

15-Jun-06 2:32

Milton KB wrote:
just another tool:

looks like the same...

TOXCCT >>> GEII power

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

Re: Memory leaks

FarPointer15-Jun-06 2:05

FarPointer

15-Jun-06 2:05

try out :-Rational Purifier .

Regards,
FarPointer
Blog:http://farpointer.blogspot.com/

Re: Memory leaks

Sarath C15-Jun-06 2:07

Sarath C

15-Jun-06 2:07

there are proffessional licensed tools like Numega Bounds Checker and inte vtune performance analyser.

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Understanding State Pattern in C++

Re: Memory leaks

Ganesh_T15-Jun-06 2:38

Ganesh_T

15-Jun-06 2:38

Search for AQTime and Rational Purify

Cheers
"Peace of mind through Technology"

Re: Memory leaks

John R. Shaw15-Jun-06 2:40

John R. Shaw

15-Jun-06 2:40

I use BoundsChecker from NuMega, but VC6 had functions of detecting memory leaks and there are some articles on it at CP. The best solution I found (non-group) was to put a TRACE command (that is a macro in VC6) before every allocation (new, malloc, etc...) and deallocation (delete, free, etc...) in your program. That includes constructors and destuctors in your classes, that way you know if you are the source of the leak or one of the libraries is. Use your imagination and you will find there are many ways to discover such problems; including appending the results to some file.

INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

Re: Memory leaks

David Crow15-Jun-06 3:25

David Crow

15-Jun-06 3:25

MFC does this same sort of thing automatically when the application is closed.

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

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

Re: Memory leaks

John R. Shaw15-Jun-06 4:01

John R. Shaw

15-Jun-06 4:01

Hey David,

That is kind of what I was talking about when saying whether you are creating the leaks or the library is. MFC actually was the cause of some leaks under VC6; I can not remember right now where they where, but they where there. If I was to dig a bit I think I would find a case where they load a font, use it, select the old font, and then proceed without releasing the font they had loaded.

Just for kicks:
1) Heck I never realized you where 8 years younger than me before.
2) “The largest…” sounds familiar are you sure you are the original source?
3) “Judge not by…” explain that one to an Arab when they are starring you in the eye during negotiations in order to see if they dilate, which indicates whether you are lying or not.

INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

Re: Memory leaks

David Crow15-Jun-06 4:12

David Crow

15-Jun-06 4:12

Yes, MFC does have a few, but those too are revealed when your application is shut down.

John R. Shaw wrote:
2) “The largest…” sounds familiar are you sure you are the original source?

I'm not 100% sure. I heard on the radio that all thing begin as something, even fire as a spark. I thought about that for a minute and settled on the quote. If it belongs to someone else, it was not intentional.

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

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

Re: Memory leaks

John R. Shaw15-Jun-06 5:23

John R. Shaw

15-Jun-06 5:23

I believe you 100%, but I know I have read or heard that quote before (multiple times). But half the stuff I figured out or made a statement about (mostly when I was younger) had already been done by someone else. When I first sat down with a piece of graphics paper and figured out how to draw a line (simple algebra) via C code (before the Web) I was not shocked that some one else had already done that. What bothered me was that he (some professor) wrote a paper on it (years before) and therefore (from an academic point of view) I could not have figured it out on my own. I some times think we are dealing with a bunch of intellectual idiots, just because someone solved the same problem before you did (and you did not know about it) does not lessen the fact that you discovered it [separately].

I got a little carried away there. I am going back to school and discovered a few months back that no matter how accurate my paper is I still need to search the Web to find [supporting] references, because I am not an expert until I have published (with per-review). Even then you are not an expert on the subject unless you where the first person to write about it, in which case you can quote yourself.

“When you fall down it hurts!” – John R. Shaw

INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

prblm with mappedbitmap

Ramu.e15-Jun-06 1:17

Ramu.e

15-Jun-06 1:17

i used LoadMappedBitmap,CreateMappedBitmap in my program.it is compiled successfully but it is showing runtime error?why?

E-Ramu

Re: prblm with mappedbitmap

Hamid_RT15-Jun-06 1:23

Hamid_RT

15-Jun-06 1:23

Can you be more specific,how to use?whats error?

whitesky

Re: prblm with mappedbitmap

kakan15-Jun-06 1:38

kakan

15-Jun-06 1:38

What does the debugger say about the problem?

Re: prblm with mappedbitmap [modified]

Ramu.e15-Jun-06 1:57

Ramu.e

15-Jun-06 1:57

CBitmap b;
b.LoadMappedBitmap(IDB_BITMAP3,0);
i wrote these 2 lines.the debugger is showing that "the memory could not be read".but it is working when i use b.LoadBitmap(IDB_BITMAP3) instead of MappedBitmap

E-Ramu

-- modified at 8:01 Thursday 15th June, 2006

Re: prblm with mappedbitmap

Hamid_RT15-Jun-06 2:18

Hamid_RT

15-Jun-06 2:18

i wrote

<br />
CBitmap b;<br />
b.LoadMappedBitmap(IDB_BITMAP,0);

and it return 1 and it work a another question whats IDB_BITMAP3?(detaily)

whitesky

Re: prblm with mappedbitmap

Ramu.e16-Jun-06 0:38

Ramu.e

16-Jun-06 0:38

void CMainFrame::OnCreate()
{
CBitmap b;
b.LoadMappedBitmap(IDB_BITMAP1,0);
m_bt.SetBitmap(b);
}
Note:-Here IDB_BITMAP1 is a bitmap ID and m_bt is a button.i want to place the bitmap on button.if i use b.LoadBitmap(IDB_BITMAP1) instead of LOadMappedBitmap it is working correctly.where is the problem?

E-Ramu

Re: prblm with mappedbitmap

Hamid_RT16-Jun-06 4:01

Hamid_RT

16-Jun-06 4:01

Are you sure that your problem is LoadMappedBitmap i write your code but i get return 1 one question why you use this function in OnCreate

whitesky

How to clear the drawings?

llp00na15-Jun-06 1:12

llp00na

15-Jun-06 1:12

Dear Everyone;

I have got a picture control placed on top of an activex control (web broswer).Just to make th eproblem clearer i had to do some drawings on top of the web browser. I have then subclassed the picture control and overriden its OnPaint() function.
I am doing some drawings in the overridden OnPaint(). Now, everytime the user clicks on a button "Draw" a flag is set to TRUE in the overriden OnPaint() and some shapes are drawn. The drawings are done fine Smile | :)

I have another button "Clear" that is supposed to clear the previous drawings. How do i clear what i have drawn ??

Thank you Smile | :)

llp00na

Re: How to clear the drawings?

Cedric Moonen15-Jun-06 1:50

Cedric Moonen

15-Jun-06 1:50

Call Invalidate and draw nothing in the OnPaint()

Cédric Moonen
Software developer

Charting control

Re: How to clear the drawings?

llp00na15-Jun-06 23:26

llp00na

15-Jun-06 23:26

thanx for your reply;

I used your approach. However i had the background (the web browser) erased evrytime Invalidate is called. So i did what guys suggested (hiding the control).
cheers

llp00na

Re: How to clear the drawings?

John R. Shaw15-Jun-06 2:59

John R. Shaw

15-Jun-06 2:59

Cédric Moonen is absolutely correct; that is the simplist solution. Big Grin | :-D

But since you say you have a picture control placed on top of the other window, why don't you just hide it. The problem with not drawing anything when OnPaint() is called (for the picture control) is that the picture control is still there and it may call a function to erase the background before calling OnPaint(), which would leave an empty blank spot on the screen.

Just some thoughts,

INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

Re: How to clear the drawings?

llp00na15-Jun-06 23:22

llp00na

15-Jun-06 23:22

Thanx alot,

Cedric Moonen' suggestion was n't giving me the right result. It's exactly how u explained it. I had the background erased everytime Invalidate was called. Hiding the control worked much better.

llp00na

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