C / C++ / MFC

20-May-06 2:11

Ramu.e wrote:
What is CRuntimeClass,RUNTIME_CLASS?How can we use these?Where do we use these?

CRuntimeClass is a structure
RUNTIME_CLASS is a MACRO which gets the run-time class structure from the name of a C++ class.

RUNTIME_CLASS returns a pointer to a CRuntimeClass structure for the class specified by class_name. Only CObject-derived classes declared with DECLARE_DYNAMIC, DECLARE_DYNCREATE, or DECLARE_SERIAL will return pointers to a CRuntimeClass structure.

As per my knowledge
-one use of the RUNTIME_CLASS is for Creation of the User Interface Threads
-other use of RUNTIME_CLASS is for Creation of the SpliterWindows.

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

Re: About Runtime class

Ramu.e21-May-06 22:59

Ramu.e

21-May-06 22:59

Thank you Lakshman Rose | [Rose]

E-Ramu

Re: About Runtime class

Laxman Auti21-May-06 23:34

21-May-06 23:34

Welcome

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

AlphaBlend Method

_raghu20-May-06 1:17

_raghu

20-May-06 1:17

I'm a newbie to VC++. I'm working on Graphics and wants to know how to make use of CDC class' alphablend method. I scrolled thru the MSDN but didnt find it much useful as there was no example describing it.

I heard that by using alphablend method we can achieve high quality graphics as it enables transperancy.

I wud be more happy if i can get an example.

Please somebody help me! ...

raghu

Monty²20-May-06 1:33

Monty²

20-May-06 1:33

Help[^] is on the way Big Grin | :-D

You know you're obsessed with computer graphics when you're outside and you look up at the trees and think, "Wow! That's spectacular resolution!"

_raghu20-May-06 1:45

_raghu

20-May-06 1:45

Thanks for the reply pal ...........but that didnt help me to know how BLENDFUNCTION structure works. Moreover the project is a DIALOG BASED....
I'm doing my work in SDI.

Can't i get a simple example that uses alphablend function and displays a simple rectangle?

ne how thanks once again ...for the reply....

raghu

Monty²20-May-06 1:53

Monty²

20-May-06 1:53

You are lazy Hmmm | :|

You know you're obsessed with computer graphics when you're outside and you look up at the trees and think, "Wow! That's spectacular resolution!"

Moving Linee on a image [modifed]

Hamid_RT20-May-06 1:54

Hamid_RT

20-May-06 1:54

See

<br />
	BLENDFUNCTION bend;<br />
	bend.BlendOp=AC_SRC_OVER;<br />
	bend.BlendFlags=0;<br />
	bend.AlphaFormat=AC_SRC_OVER;<br />
	bend.SourceConstantAlpha=50;<br />
AlphaBlend(GetDC()->m_hDC,0,0,400,400,m_pDC.m_hDC,0,0,0,0,bend);<br />

maybe it is some helpful to you of course you need to insert bitmap to dc

whitesky

anjita20-May-06 0:12

anjita

20-May-06 0:12

in my code i am displaying a bmp image
Now i want to display a moving straight line from top to bottom on my image
The problem i am facing is the previous line i am displaying using
for(int i = 0 ; i < 10 ; i++)
{
dc.SelectStockObject(WHITE_PEN);
dc.MoveTo(pStart);
dc.LineTo(pEnd);

pStart.y = pStart . y + ldlist;
pEnd . y = pStart . y ;

}
remains but i want everytime only a single line should be shown
where ldlist is the distance my line shud move

-- modified at 6:12 Saturday 20th May, 2006

Re: Moving Linee on a image

_AnsHUMAN_ 20-May-06 0:20

_AnsHUMAN_

20-May-06 0:20

Check SetROP2() and draw twice to show the effect that only a single line is moving you have to redraw the previous line with back color.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Property Sheets and Pages

si_6919-May-06 23:53

si_69

19-May-06 23:53

Hi All

I have a property sheet wizard i am using, which has three pages
on the second page, when the user clicks next to go to the final page
depending on which option they have chosen on page 2 (i,e A or B)
a different property page will be displayed,

So if option A is selected on page 2 when next is clicked property page X is displayed
but if option B is selected on page 2 next is clicked property page Y is displayed

hope that makes sense?

I take it i would need to override the OnNext in page2 but im not sure
what to put to display the property page that i want
Can any one help

Simon

Kiran Kumar Singani20-May-06 2:03

Kiran Kumar Singani

20-May-06 2:03

Hi Simon,
U can set the dialog into the ur property page 3 dynamically. when ever user click the Next on Page 2 based on option us et the appropriate dialog on 3 rd property page .

si_6920-May-06 6:42

si_69

20-May-06 6:42

Thanks for the reply kiran

when you say

Kiran Kumar Singani wrote:
U can set the dialog into the ur property page 3 dynamically

could you give me an example??

thanks

si

Michael Dunn20-May-06 13:05

Michael Dunn

20-May-06 13:05

The return value from OnNext() determines which page is displayed next:

Return 0 to allow the wizard to go to the next page. Return -1 to prevent the wizard from changing pages. To display a particular page, return its dialog resource identifier.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

si_6920-May-06 13:09

si_69

20-May-06 13:09

Thanks, but when you say

Michael Dunn wrote:
To display a particular page, return its dialog resource identifier.

im not sure what you mean, can you give me an example??

Michael Dunn20-May-06 14:16

Michael Dunn

20-May-06 14:16

IDD_WIZARD_PAGE_X or whatever IDs you assigned to the dialogs.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Color Scheme

RockyJames19-May-06 21:15

RockyJames

19-May-06 21:15

Hi,
How to get Current Color Scheme of the System.I am working on Widnows Xp.How to get the current Color Scheme that is selected .

Thanks in before
James

Re: Color Scheme

Nibu babu thomas19-May-06 21:37

Nibu babu thomas

19-May-06 21:37

RockyJames wrote:
How to get Current Color Scheme of the System.I am working on Widnows Xp.How to get the current Color Scheme that is selected .

Take a look at GetSysColor.

Nibu thomas
Software Developer

Programming Tips[^]

Re: Color Scheme

Laxman Auti19-May-06 23:09

Release Code Optimization Problems..

19-May-06 23:09

RockyJames wrote:
How to get Current Color Scheme of the System.I am working on Widnows Xp.How to get the current Color Scheme that is selected .

You can get the different colors of the system from the following path of the registry
HKEY_CURRENT_USER\Control Panel\Colors

and for the the current color schemes
HKEY_CURRENT_USER\Control Panel\Current

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

Re: Color Scheme

RockyJames20-May-06 0:14

RockyJames

20-May-06 0:14

when we right click on the desktop.. properties -> In Appearances tab i want the current selected color scheme in ColorScheme Combo Box..and its respective RGB value..IS there any method to do it?

Thank`s in berfore
James

rbid19-May-06 20:45

rbid

19-May-06 20:45

Hello,

SCENARIO:

I have some "C" code that runs heavy math, that takes time to get the results.
Compiling under a Debug configuration, all goes as required.. but the run sessing is to slow (few hours to get the results.)
Compiling under a Release configuration, fails to get the required results.
(Release configuration with its default Speed code optimization (/O2 flag))
When I turn off speed optimizations under Release configurations, the results are O.K, but again, it runs slower than expected.

QUESTIONS

How can I detect what does causes this differences on the code?
How can I debug this code and catch the affecting lines?

I guess that this has to do in the way this "C" code is written, that optimizing it for speed causes the differences. All this code runs under the same thread, and uses data that is static.

Any hint? Sigh | :sigh:

Thanks in Advance.

-- Ricky Marek (AKA: rbid)
-- "Things are only impossible until they are not" --- Jean-Luc Picard

My articles

Laxman Auti19-May-06 20:59

19-May-06 20:59

rbid wrote:
All this code runs under the same thread

Create the seperate synchronised threads for the large calculations
and which is not much dependent on each other

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

rbid19-May-06 21:14

rbid

19-May-06 21:14

A_Laxman wrote:
rbid wrote:
All this code runs under the same thread

Create the seperate synchronised threads for the large calculations
and which is not much dependent on each other

This is exactly how it is implemented. The code that has the problem runs on a separate synchronized thread.

Even if I encapsulate the code on a single "console application", the problem persists.

Thanks for your thoughts, this place is a great place for getting good ideas and solutions.

-- Ricky Marek (AKA: rbid)
-- "Things are only impossible until they are not" --- Jean-Luc Picard

My articles

Saurabh.Garg19-May-06 22:32

Saurabh.Garg

19-May-06 22:32

If a code runs in debug mode and not in release mode then most probably there is a bug in the code, which is exposed in release mode due to optimizations.

If you are using VS 2005 (this might work with VS 2003 also but I am not sure since I never used it) then its simple, just put break point in the code and let then program run under debugger. When program crashes visual studio will give you an option of breaking into the code. This way you will know where exactly is the problem.

If you are using some older versions then try debugging the usual way. Look carefully at pointers, if you are using them. Try putting testing fprintf's/ or AfxMessageBox's (if you are using MFC) in release mode at various places and see how far code is able to execute. Another way might be to take crash address and find which souce line it corresponds to using a map file[^]. When using a map file you might get crash at a line which is not in your code or at a place where you are sure there's nothing wrong. In that case you will have to figure out which functions are calling the function which crashed.

Hope this helps.

-Saurabh