C / C++ / MFC

Mark Salsbery4-Jan-07 12:55

4-Jan-07 12:55

To add to the other responses...

There's also the Multimedia Timer Functions[^]

Larry Osterman[^] has reported Windows timer accuracy findings in the OS source
code for some time but this fairly new article is the first time I've seen it documented by
Microsoft:
Inside Windows NT High Resolution Timers[^]

ThatsAlok4-Jan-07 18:02

ThatsAlok

4-Jan-07 18:02

acerunner316 wrote:
I am using Sleep(10) in my thread to post a windows message every 10ms.

Sleep(10) doesn't sleep your thread fro 10 ms, as windows is not realtime system... actually it sleep time range between 10 ms to 54 ms depending on current load on the system and processor speed

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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Joe Woodbury4-Jan-07 19:00

Joe Woodbury

4-Jan-07 19:00

Generally Windows NT and later have a timer interrupt of 10ms. However the HAL for some systems has set it to use 15ms. This means you can't sleep for less than that amount using the timeouts for Sleep() and Wait...() calls.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

kasturi_haribabu4-Jan-07 19:07

kasturi_haribabu

4-Jan-07 19:07

1. Are you sure your function which is posting message takes '0'ms to execute ?

I raise this question because, if your calling code has a lot to do and then sleep 10 ms, the interval between subsequent calls would be
(Sleep time + Time taken to execute other part of the function).

If you are very specific about the response time, i dont think post message is the right way to address such issuesbecause the latency of the response is not guaranted.

You can use Events or a Semaphore-give-release technique to decrease the latency further.

but the technique you need to choose depends on your applcation.

Haribabu.

acerunner3165-Jan-07 8:43

acerunner316

5-Jan-07 8:43

I don't know if it takes 0ms, but there is nothing else to my code other than repeatedly posting messages.

UINT CNOx1000MonitorDlg::FThreadLoop (LPVOID PptrToClass)<br />
{<br />
	CMainWindowDlg *LptrClass = static_cast<CMainWindowDlg *>(PptrToClass);<br />
	HWND *ptrWindowHandle = new HWND;<br />
	*ptrWindowHandle = LptrClass->GetSafeHwnd();<br />
<br />
	while(LptrClass->mbolThreadExecute)<br />
	{<br />
		::PostMessage(*ptrWindowHandle, WM_UPDATE_CONTROLS, 0, 0);<br />
		::Sleep(10);<br />
	}<br />
	delete ptrWindowHandle;<br />
	return 0;<br />
}

WPF, XAML, Expression Blend and MFC [modified]

S Douglas5-Jan-07 1:30

S Douglas

5-Jan-07 1:30

acerunner316 wrote:
but 6ms delay is still way too slow

To get an understanding of how time works read Time is the Simplest Thing[^]

I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:

AAntix4-Jan-07 10:00

AAntix

4-Jan-07 10:00

I've been looking at Microsoft's Expression Blend[^] the past couple of days and have read this article : .NET 3.0 WPF Tools && Examples[^].

We currently have a legacy MFC based application that does a lot of GDI rendering. What I would like to be able to do is embed an Expression Blend composition within our application and dynamically control the properties of the rendering through the wrapping app.

E.g. The Expression Blend composition is showing a red car rotating and the user chooses blue from our app, I'd like to dynamically change the render to blue.

Has anyone looked at embedded any XAML based creations within their own legacy MFC based apps?

Thanks in advance.

-- modified at 16:10 Thursday 4th January, 2007
Looks like Nish may have done some work in this area?

Jim
RunFatBoy.net[^] - Exercise for the rest of us.

doubel buffering with GDI problem

ceejeeb4-Jan-07 8:31

4-Jan-07 8:31

can someone explain what im doiing wrong here:

<br />
HBRUSH backBrush = ::CreateSolidBrush(RGB(pLevels->frequency[0][0],0,0));<br />
<br />
HDC memDC = CreateCompatibleDC ( hdc );<br />
HBITMAP bitmap1 = CreateCompatibleBitmap(memDC,prc->left,prc->bottom);<br />
HBITMAP oldBitmap = SelectObject(memDC,bitmap1);<br />
<br />
::FillRect(memDC,prc,backBrush);<br />
::Ellipse(memDC,20,20,120,120);<br />
::BitBlt(hdc,0,0,prc->left,prc->bottom,memDC,0,0,SRCCOPY);<br />
<br />
::DeleteObject( backBrush );<br />
::SelectObject(memDC, oldBitmap);<br />
::DeleteObject(bitmap1);<br />
::DeleteDC(memDC);<br />

It just doesnt display anything.

Mark Salsbery4-Jan-07 8:36

4-Jan-07 8:36

Is prc->left what you intended as the bitmap width in the call to
CreateCompatibleBitmap(memDC,prc->left... ??

It's used in BitBlt too...

Mark

ceejeeb4-Jan-07 8:38

4-Jan-07 8:38

yes it is the width

Mark Salsbery4-Jan-07 8:42

4-Jan-07 8:42

ceejeeb wrote:
yes it is the width

If that's the case then how will this work...

::FillRect(memDC,prc,backBrush);

Are you sure you don't mean to use prc->right?

Mark

ceejeeb4-Jan-07 8:45

4-Jan-07 8:45

ahh yes my mistake it was menat to be right.
Now its draws to the screen but not as intended the back background is dotted black and white.

Mark Salsbery4-Jan-07 8:47

4-Jan-07 8:47

try changing
HBITMAP bitmap1 = CreateCompatibleBitmap(memDC,prc->left,prc->bottom);
to
HBITMAP bitmap1 = CreateCompatibleBitmap(hdc,prc->right,prc->bottom);

The default bitmap for a dc is monochrome - you want a bitmap compatible with the original dc.

Smile | :)

ceejeeb4-Jan-07 8:56

dynamic CImageList icons - possible? [modified]

4-Jan-07 8:56

Thanks alot mark all is working fine now. Big Help.

neilsolent4-Jan-07 8:13

neilsolent

4-Jan-07 8:13

I have a CTreeCtrl and an associated CImageList. Is there any way I can load images into the CImageList at runtime (e.g. from an .ico file supplied by the user) without them being hardcoded into the executable files ?

-- modified at 14:21 Thursday 4th January, 2007

cheers,
Neil

Mark Salsbery4-Jan-07 8:26

4-Jan-07 8:26

You can add/remove images from image lists dynamically.

Check out CImageList::Add() (::ImageList_AddIcon()), ::LoadImage(), etc.

Mark

James R. Twine4-Jan-07 8:29

James R. Twine

4-Jan-07 8:29

   Yes - although if dealing with a lot of images it is better to initially size the ImageList control to hold a bunch of images.

   The CImageList::GetImageInfo(...) function or the ImageList_GetImageInfo(...) macro can be used to write data into the images maintained by the ImageList control.

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
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CPallini4-Jan-07 8:38

CPallini

4-Jan-07 8:38

see
here

Note: you can dynamically load an image using the LoadImage API.

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Hamid_RT4-Jan-07 18:11

Hamid_RT

4-Jan-07 18:11

Yes you have many good function in CImageList Add,Remove,Replace

WhiteSky

neilsolent6-Jan-07 0:09

neilsolent

6-Jan-07 0:09

Thanks to everyone for the posts.

I know these functions, but they don't realy explain how to load icons from files or "external" data sources - this is what I meant by dynamic (the icons aren't already hardcoded as resources in the executables). I found the functions I was looking for, which are:

ExtractIcon() - load icon from disk
CreateIconFromResourceEx() - load icon from memory

Sorry, I think I should have explained what I was after a bit better..

cheers,
Neil

Restricting access to Windows

Hamid_RT6-Jan-07 19:13

Hamid_RT

6-Jan-07 19:13

I think you need to SHGetFileInfo to get information about file and... and also if you dont know about CImageList and its functions search on the codeproject it has a lot of good articles Smile | :)

WhiteSky

pcfilho4-Jan-07 7:26

pcfilho

4-Jan-07 7:26

Good afternoon,

I would like to restrict access to Windows in my program. More especifically, I want to block some "key combinations" (Ctrl-Alt-Del, Alt-Tab, Windows key). Until now, I did not find anything to help me.

Can someone help me?

Thanks for the attention,
Paulo Cezar

PCFilho
Rio de Janeiro, Brazil

Re: Restricting access to Windows

Mark Salsbery4-Jan-07 7:57