Re: How to make ListView's scroll absolutely without flickering - example included - C / C++ / MFC Discussion Boards

Chintan8-Aug-03 23:11

8-Aug-03 23:11

Hello guys,

I am frequently using one WorkerThread in my application. It is starting using AfxBeginThread() function. When I run application from within IDE, debug window is also not showing any memory leake.

But when I run this application in Windows NT, its task manager shows memory usage going on increasing by time in chunk of 4 KB.

Can anybody show me the way to control this memory wastage.

Thanking You,

C.R.Naik

Re: Memory problem with WorkerThread

valikac9-Aug-03 4:32

valikac

9-Aug-03 4:32

There are several possible reasons. One reason is that the threads do not terminate correctly. Another reason is that the process does not deallocate memory correctly.

Kuphryn

Re: Memory problem with WorkerThread

Chintan10-Aug-03 22:45

Chintan

10-Aug-03 22:45

1. I have used "return 0;" statement to return from thread's controlling function and hence to terminate thread.

2. How can you make sure that the process deallocates memory correctly ?

Thanking You

C.R.Naik

Capturing Windows Events

bob_brown_20008-Aug-03 21:57

bob_brown_2000

8-Aug-03 21:57

Hello All,

I am trying to find a easy-to-understand way where I set up a handler that can detect changes to my windows screen. basically, whenever the screen changes, I want to be notified by Windows.

I know that I can tap in to windows hooks to do this, but I have not been able to understand the code too well.

Is there a simple tutorial that can guide me through this problem. TIA.

RGB

How to make ListView's scroll absolutely without flickering - example included

s_k8-Aug-03 20:45

s_k

8-Aug-03 20:45

Hi all,
I am trying to make my ListView (displaying files) scroll without any flickering. But I cannot get it work. I tried for example putting GetListCtrl().SetRedraw(FALSE) and GetListCtrl().SetRedraw(TRUE) around CListView::OnKeyDown() call if key pressed was PAGE DOWN or PAGE UP, but it made things even worse.

For example this program does absolutely no flickers!
http://www.altap.cz/ftp/salamand/salen200.exe
Try scrolling eg. WINNT\System32 directory of any other directory with thousand of files with Page Down key held and you will see that.

How is this possible???

I am using virtual ListView.

Thank you for any suggestion!

Re: How to make ListView's scroll absolutely without flickering - example included

ColinDavies8-Aug-03 20:51

ColinDavies

8-Aug-03 20:51

Maybe you should do a search here at CP for articles by "Keith Rule" and see his CMemDC class.

Regardz
Colin J Davies

* WARNING *
This could be addictive
The minion's version of "Catch Green Alien | [Alien] "

It's a real shame that people as stupid as you can work out how to use a computer. said by Christian Graus in the Soapbox

Re: How to make ListView's scroll absolutely without flickering - example included

s_k8-Aug-03 21:47

s_k

8-Aug-03 21:47

Thanks for your suggestion Colin. Unfortunately, CMemDC doesn't work for my CListView-derived class. CMyView::OnDraw() is never executed and returning FALSE in OnEraseBackground() casues my ListView not being updated and look ugly...Don't you know why?

Best regards,
Standa.

Re: How to make ListView's scroll absolutely without flickering - example included

Ryan Binns8-Aug-03 21:52

Ryan Binns

8-Aug-03 21:52

s_k wrote:
CMyView::OnDraw() is never executed

That's correct behaviour. View derived from CCtrlView never have their OnDraw() method called. You'll have to use OnPaint() instead.

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"

Re: How to make ListView's scroll absolutely without flickering - example included

s_k8-Aug-03 21:55

s_k

8-Aug-03 21:55

But how can I then use CMemDC class, when it needs CDC pointer to be passed to constructor?

Re: How to make ListView's scroll absolutely without flickering - example included

Ryan Binns8-Aug-03 22:01

Ryan Binns

8-Aug-03 22:01

void CMyList::OnPaint()
{
    CPaintDC dc(this);
    CMemDC memDC(&dc);
    // ...
}

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"

Re: How to make ListView's scroll absolutely without flickering - example included

s_k8-Aug-03 22:07

s_k

8-Aug-03 22:07

Thank you Ryan, it works. But, in fact, I don't know what to wirte into OnPaint() handler routine. I have just CListView that displays list of files on local drives and the only thing I wanted to achieve is to get rid of flickering while scrolling the content of ListView....

Re: How to make ListView's scroll absolutely without flickering - example included

Ryan Binns8-Aug-03 22:22

Ryan Binns

8-Aug-03 22:22

void CMyList::OnPaint()
{
    CPaintDC dc(this);
    CMemDC memDC(&dc);
    DefWindowProc(WM_PAINT, (WPARAM)memDC.m_hDC, 0);
}

Hope this helps,

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"

Re: How to make ListView's scroll absolutely without flickering - example included

s_k8-Aug-03 22:33

s_k

8-Aug-03 22:33

Thanks Ryan! Now list of files is drawn, but for example column headers are not visible till I click on them. I'm using Custom Draw feature, maybe it has something to do with it...

Re: How to make ListView's scroll absolutely without flickering - example included

Ryan Binns8-Aug-03 22:53

Ryan Binns

8-Aug-03 22:53

s_k wrote:
I'm using Custom Draw feature, maybe it has something to do with it...

Possibly, but I'd still expect it to work. I haven't done this with custom draw, so I don't really know. Try removing the custom draw, and then trying again. If it paints, then that's good, and you might just have to do without the custom draw. You might need to do full owner draw instead. If not, I'm sorry I can't help much more.

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"

Re: How to make ListView's scroll absolutely without flickering - example included

Arjan Schouten9-Aug-03 7:21

Arjan Schouten

9-Aug-03 7:21

Hi,

You have to exclude the headers from the clipbox,

Try something like this...

  CPaintDC dc(this);<br />
<br />
      CRect headerRect;<br />
      CRect clientRect;<br />
<br />
      GetClientRect(&clientRect);<br />
      GetDlgItem(0)->GetWindowRect(&headerRect);<br />
      ScreenToClient(&headerRect);<br />
      dc.ExcludeClipRect(&headerRect);<br />
<br />
      CMemDC memDC(&dc);<br />
      //memDC.FillSolidRect(&clientRect, RGB(255, 255, 255));<br />
<br />
      DefWindowProc(WM_PAINT, (WPARAM)memDC->m_hDC, (LPARAM)0);<br />
<br />

Arjan

Re: How to make ListView's scroll absolutely without flickering - example included

PJ Arends9-Aug-03 5:51

PJ Arends

9-Aug-03 5:51

Does CListCtrl::Scroll() not work?

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: How to make ListView's scroll absolutely without flickering - example included

s_k9-Aug-03 6:07

s_k

9-Aug-03 6:07

Hi,
maybe I post my question in a wrong way - I AM able to scroll the content of my ListView, I have vertical scrollbar there and pressing Key Down/Up keys also scroll the ListView. But in case when I have for example 10.000 files in ListView and I'm holding Page Key/Up or moving fastly with scroll bar, ListView "flashes", or how to say that...So I'm looking for some method with help of which I would make my ListView scroll without flashing/flickering...And in post there is link to one piece of software that does it greatly.

Best regards,
Standa.

Re: How to make ListView's scroll absolutely without flickering - example included

PJ Arends9-Aug-03 6:15

PJ Arends

9-Aug-03 6:15

Ok, I misunderstood your question.

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Buttons in Flash

emmatty8-Aug-03 18:26

emmatty

8-Aug-03 18:26

how can i put a flash interfacein my MFC Program????

Re: Buttons in Flash

ColinDavies8-Aug-03 20:43

ColinDavies

8-Aug-03 20:43

10 Simple steps
1. Make a movie in flash that is one frame long, and all the other movie clips are in this one movie.
2. Add your buttons and controls in flash.
3. Using actionscript add a global variable for when each control is selected or moused over etc (Roll Over)
4. Add the ocx and header stuff to your MFC app
5. Include the swf file in your workspace
6. Use the res protocol to load the swf movie when needed
7. Start a timer.
8. When the timer fires have it poll the flash variable to see it's state.
9. Do the button actions intentions.
10. If all this works out Ok, to show your appreciation you can write a CP Article about how it's done.

Regardz
Colin J Davies

* WARNING *
This could be addictive
The minion's version of "Catch Green Alien | [Alien] "

It's a real shame that people as stupid as you can work out how to use a computer. said by Christian Graus in the Soapbox

OpenCV HMMDemo NULL pointer passed...

JoeSox8-Aug-03 17:19

JoeSox

8-Aug-03 17:19

HMMDemo compiles but I get this error
In function cvGetMat():[......cvarray.cpp Line 2734]....
NULL pointer passed....
ErrMode=CV_ErrorModeLeaf

What should I do to correct this error?
(MSVC++ 6.0 sp5, windows xp home)

Later,
JoeSox
www.humanaiproject.org
"The worst fad has been these stupid little robots,
Graduate students are wasting 3 years of their lives
soldering and repairing robots, instead of making them smart.
It's really shocking." -Marvin Minsky.

Privileged instructions

gdassieu8-Aug-03 17:16

gdassieu

8-Aug-03 17:16

Hi all!

I'm trying to execute:
_asm
{
hlt
}
and of course I am getting an error (since hlt is a privileged ASM instruction). I'd like to know how to get this working (I know software like CPUIdlePro does that, so there MUST be a way Sniff | :^)

Thanks in advance.

Re: Privileged instructions

John M. Drescher8-Aug-03 19:11

John M. Drescher

8-Aug-03 19:11

I believe Win2k and XP are already doing this. And the answer to your question is you have to write a device driver.

John

Reading an XML feed

Steve Messer8-Aug-03 13:54

Steve Messer

8-Aug-03 13:54

Hi all,

I am wondering how to read an XML feed from a website programatically?

If I am using a browser I just type in the corresponding info into the address bar and the results are returned as an XML file displayed in the browser.

How programatically can you query a website for its XML feed without opening the browser?

Thanks,

Steve

Re: Reading an XML feed

ColinDavies8-Aug-03 20:59

ColinDavies

8-Aug-03 20:59

How about using WinInet
and stuff like CInternetSession, CHttpFile, CHttpConnection, depending on what you want todo their are several ways of doing this.

Regardz
Colin J Davies

* WARNING *
This could be addictive
The minion's version of "Catch Green Alien | [Alien] "

It's a real shame that people as stupid as you can work out how to use a computer. said by Christian Graus in the Soapbox

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.