C / C++ / MFC

How to get time in microseconds?

2-Apr-09 9:38

Actually the strategic plan designate:

Him as the software requirements' author.
You as the developer.

Good luck to the Dream-Team!
Big Grin | :-D

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.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

kapardhi2-Apr-09 3:10

kapardhi

2-Apr-09 3:10

Hello !

Hai in my application i have to display time taken for execution, at present i am using GetTickCount (), this function gives time in milliseconds, i need more detailed result i.e in microseconds, is there any similiar function?

thanks!

Re: How to get time in microseconds? [modified]

David Crow2-Apr-09 3:26

2-Apr-09 3:26

Well, you could either ~~divide~~ multiply that result by 1000, or resolve to the notion that unless you have a RTOS, you aren't going to get any better than 15ms resolution.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

modified on Thursday, April 2, 2009 9:34 AM

CPallini2-Apr-09 3:30

2-Apr-09 3:30

DavidCrow wrote:
Well, you could either divide that result by 1000

Anyway he should multiply by 1000. Roll eyes | :rolleyes:

David Crow2-Apr-09 3:33

2-Apr-09 3:33

Ahh, what's a few decimal places going to matter? D'Oh! | :doh:

CPallini2-Apr-09 3:37

2-Apr-09 3:37

You're right, moreover most digits are zeroes...Who cares? Big Grin | :-D

David Crow2-Apr-09 3:40

2-Apr-09 3:40

It doesn't, but I made that same suggestion to some chap a long time ago and he said it was what he needed. I guess three more zeros made all the difference.

CPallini2-Apr-09 3:26

Closing my C++ program when a specific window is closed

2-Apr-09 3:26

QueryPerformanceFrequency [^] / QueryPerformanceCounter [^] pair maybe interesting.
Smile | :)

krrilee2-Apr-09 2:52

Re: Closing my C++ program when a specific window is closed

2-Apr-09 2:52

I have a HWND pointing to the window in question. Is there any way I can close down my program when the HWND is closed?

Thanks in advance Smile | :)

David Crow2-Apr-09 3:04

Re: Closing my C++ program when a specific window is closed

2-Apr-09 3:04

Use IsWindow(). If it returns 0, close your program.

krrilee2-Apr-09 3:17

Re: Closing my C++ program when a specific window is closed

2-Apr-09 3:17

The program while loop looks like this:

while ( GetMessage(&amp;msg, NULL, 0, 0) ) {
	if (IsWindow(hWnd) == 0) {
		//close program
	}
	if (!TranslateAccelerator(msg.hwnd, hAccelTable, &amp;msg)) 
	{
		TranslateMessage(&amp;msg);
		DispatchMessage(&amp;msg);
	}
}

So, IsWindow is not called until a message is received.

Jörgen Sigvardsson2-Apr-09 3:45

Jörgen Sigvardsson

2-Apr-09 3:45

while(GetMessage(&msg, 0, 0, 0)) {
   if(!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
   }
   
   if(msg.message == WM_DESTROY && msg.hwnd == hWnd) {
      break; // Exit message pump and do whatever finalization that is needed
   }
}

--
Kein Mitleid Für Die Mehrheit

Re: Closing my C++ program when a specific window is closed

krrilee2-Apr-09 4:14

Re: Closing my C++ program when a specific window is closed

2-Apr-09 4:14

Thanks, but the way I have the program set up is hWnd refers to a hidden window which allows me to get a system tray. hWndConsole refers to the console window (which is external to my program). I want to close hWnd when hWndConsole is closed.

Any ideas on how to do this? Sorry for the confusing post.

Thanks

krrilee2-Apr-09 4:22

Re: Closing my C++ program when a specific window is closed

2-Apr-09 4:22

Actually, I just got it to work. I made the hWndConsole the parent window of the hWnd, so whenever the hWndConsole is updated, the hWnd gets a message. Then I check if the hWndConsole exists.

Thanks for the help

kapardhi2-Apr-09 3:15

kapardhi

2-Apr-09 3:15

I think you can try ExitProcess (); while closing that window.
NOTE :This function closes the total application

Re: Closing my C++ program when a specific window is closed

Rajesh R Subramanian2-Apr-09 4:20

Rajesh R Subramanian

2-Apr-09 4:20

Alternatively, you can wait inside a thread on an infinite loop, checking for the window (HWND) existence on a regular-interval of your choice with the help of Sleep(nMilliSecs) + IsWindow() and do a PostQuitMessage() to your application's main window after the said window (HWND) is closed.

This way, you can avoid all the ugly manual message translation and pumping stuff.

It is a crappy thing, but it's life -^ Carlo Pallini

Find Unique Combination Numbers from a pool list (combinations and permutations)

sdancer752-Apr-09 2:28

sdancer75

2-Apr-09 2:28

Hi,

I want from a list let's say A={1,2,3,4} with N elements, 4 in our case , to find the unique combinations for groups of K, where K=2,3...N

For example if N=4 and K=2 then the correct algorithm should output the following results

(1,2)
(1,3)
(1,4)
(2,3)
(2,4)
(3,4)

if N=4 and K=3 then it should output

(1,2,3)
(1,2,4)
(1,3,4)
(2,3,4)

and if N=4 and K=4 then

(1,2,3,4)

Can someone help me to do this without using STL Library ?

Regards

sdancer75

Re: Find Unique Combination Numbers from a pool list (combinations and permutations)

CPallini2-Apr-09 2:34

Re: Find Unique Combination Numbers from a pool list (combinations and permutations)

2-Apr-09 2:34

It looks like homerwork...I cannot provide you full code, I'd be flamed (there may be Mike around...). Roll eyes | :rolleyes:

What have you done so far?
Smile | :)

sdancer752-Apr-09 2:40

sdancer75

2-Apr-09 2:40

Thank you for your reply.

Its not a homework. Its for a sport bet kind application.

Until now I have found all the permutations of the groups but I do not want for example 1234 is equal with 4321 and its not correct.

I need also to optimize the code so, in the same loop I can find all the K groups ie groups of 2 and groups of 3.

Can you help me ?

Regards,

sdancer75

Re: Find Unique Combination Numbers from a pool list (combinations and permutations)

CPallini2-Apr-09 2:53

Re: Find Unique Combination Numbers from a pool list (combinations and permutations)

2-Apr-09 2:53

sdancer75 wrote:
Can you help me ?

Yes: read this post [^] and my answer. You may have a clue then.
Smile | :)

sdancer752-Apr-09 20:37

sdancer75

2-Apr-09 20:37

Thank you,

I think that this is what I want. I will try to convert your application to work with an array of numbers.

I pretty sure that it will work.

Best Regards Mr C-Pallini.
George

sdancer75

Re: Find Unique Combination Numbers from a pool list (combinations and permutations)

CPallini3-Apr-09 2:38

Re: Find Unique Combination Numbers from a pool list (combinations and permutations)

3-Apr-09 2:38

You're welcome George.
Carlo.
Smile | :)

Stuart Dootson2-Apr-09 3:50

Stuart Dootson

2-Apr-09 3:50

Full source code, I'm not using STL:

combinationsOf 0 _ = [[]]
combinationsOf _ [] = []
combinationsOf k (x:xs) = map ( x: ) (combinationsOf (k-1) xs) ++ combinationsOf k xs

OK, it's not C++, it's Haskell. I found it searching for "haskell combinations" on Google. I wonder how you could find C++ source code for the same...

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Find Unique Combination Numbers from a pool list (combinations and permutations)

CPallini2-Apr-09 7:30