C / C++ / MFC

Re: How to exit an application automatically?

18-Nov-04 4:44

exit();

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BlackDice18-Nov-04 4:44

Re: How to exit an application automatically?

18-Nov-04 4:44

exit();

If I write code in my sleep, does that make me brilliant, or just a lazy programmer?

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David Crow18-Nov-04 4:52

Speed of LPCTSTR versus const CString&

18-Nov-04 4:52

PostMessage(WM_CLOSE) to the main frame is what happens when you close an application manually.

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

Blake Miller18-Nov-04 4:37

Blake Miller

18-Nov-04 4:37

I have a lot of code passing in const CString& and I am wondering, which is faster, the const CString& or else forcing the conversion to LPCTSTR and passing that as the argument. I don't even need the CString-ness of the data within the functions, just access to the raw character array. Anybody here profiled this before or looked at the assembly to know which is quicker?

Re: Speed of LPCTSTR versus const CString&

Tim Smith18-Nov-04 12:45

Tim Smith

18-Nov-04 12:45

If the routine that is being called only needs to work with the LPCTSTR and doesn't need to call GetLength, then LPCTSTR is faster. However, once you start treating string as a CString in the called routine, const CString by ref is faster. What really kills speed is just passing it by CString. Thus a copy gets created each time.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

"DPI Settings" from Display Properties

Manfred Staiger18-Nov-04 4:17

Manfred Staiger

18-Nov-04 4:17

Does anybody know how to read the value DPI "Settings" displayed under
Control Panel->Display Properties->Settings->Advanced.

On a german windows installation it's called "Schriftgrad" under
Systemsteuerung->Anzeige->Einstellungen->Erweitert.

MS

Re: "DPI Settings" from Display Properties

David Crow18-Nov-04 5:03

Re: "DPI Settings" from Display Properties

18-Nov-04 5:03

How about from:

HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics\AppliedDPI

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

Manfred Staiger18-Nov-04 5:07

Manfred Staiger

18-Nov-04 5:07

Thanks a lot

MS

how to measure Time it takes for a function to execute?

dmxdmxdmx0518-Nov-04 3:49

dmxdmxdmx05

18-Nov-04 3:49

Guys/Gals,
I'm trying to find out how I can measure the amount of time a function takes to execute.

Somewhere along the line in my lengthy code , some function call is eating up more time that it should be.

How can I keep keep track of how long each function takes from the time it started executing to end of its execution.

Basically Im trying to figure out which part of the code is eating up the time.

Any ideas/thoughts would be greatly appriciated.
Thanks

Re: how to measure Time it takes for a function to execute?

V.18-Nov-04 4:04

18-Nov-04 4:04

You could write some trace info in your function to the file eg.:
functionname start : time
functionname end : time

Then you can find out maybe? There'll probably be a better way, but this could work.

good luck.

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Re: how to measure Time it takes for a function to execute?

David Crow18-Nov-04 4:47

Re: how to measure Time it takes for a function to execute?

18-Nov-04 4:47

Have you seen GetTickCount()?

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

Antony M Kancidrowski18-Nov-04 5:10

Antony M Kancidrowski

18-Nov-04 5:10

Depending on precission you may want to look at QueryPerformanceFrequency() and QueryPerformanceCounter()

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

Re: how to measure Time it takes for a function to execute?

Antony M Kancidrowski18-Nov-04 5:15

Antony M Kancidrowski

18-Nov-04 5:15

Seeing as I have a small class that will give you a TRACE of the time it takes to execute I have posted it.

// ClassTimer.h: interface for the CClassTimer class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_CLASSTIMER_H__FAFE8946_4D39_4CB7_921D_0202D60ABE26__INCLUDED_)
#define AFX_CLASSTIMER_H__FAFE8946_4D39_4CB7_921D_0202D60ABE26__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class AFX_EXT_CLASS CClassTimer
{
	CClassTimer();

public:
	CClassTimer::CClassTimer(CString sTimerName, bool bMessageBox = false);
	virtual ~CClassTimer();

	virtual void OutputNow(CString sOutput, bool bInterim = true);
	virtual void SetStart();
	virtual void SetInterim();

private:
	CString m_sTimerName;

	__int64 m_nTimerFrequency;
	__int64 m_nStartTick;

	__int64 m_nInterimTick;

	bool m_bMessageBox;
};

#endif // !defined(AFX_CLASSTIMER_H__FAFE8946_4D39_4CB7_921D_0202D60ABE26__INCLUDED_)

// ClassTimer.cpp: implementation of the CClassTimer class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "ClassTimer.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CClassTimer::CClassTimer()
{
}

CClassTimer::CClassTimer(CString sTimerName, bool bMessageBox /*= false*/)
	 : m_sTimerName(sTimerName),
	   m_bMessageBox(bMessageBox)
{
	LARGE_INTEGER Frequency;
	Frequency.QuadPart = 0;
	
	if (!QueryPerformanceFrequency(&Frequency))
	{
		TRACE(_T("Failed to get the high performance counter frequency\n"));
		return;
	}
	m_nTimerFrequency = Frequency.QuadPart;

	SetStart();
}

CClassTimer::~CClassTimer()
{
	OutputNow(m_sTimerName, false);
}


void CClassTimer::SetStart()
{
	// Set the start of the timer
	LARGE_INTEGER TimerTick;
	VERIFY(QueryPerformanceCounter(&TimerTick));

	m_nStartTick = TimerTick.QuadPart;
	m_nInterimTick = m_nStartTick;
}


void CClassTimer::SetInterim()
{
	// Set the start of the timer
	LARGE_INTEGER TimerTick;
	VERIFY(QueryPerformanceCounter(&TimerTick));

	m_nInterimTick = TimerTick.QuadPart;
}


void CClassTimer::OutputNow(CString sOutput, bool bInterim /*= true*/)
{
	LARGE_INTEGER TimerTick;

	// Get the current tick count
	QueryPerformanceCounter(&TimerTick);
	
	// Default to the interim tick
	__int64 nStart = m_nInterimTick;

	if (!bInterim)
		nStart = m_nStartTick;

	CString sPrompt;
	sPrompt.Format("%s - %ld us\n", 
					sOutput, 
					(ULONG) ((TimerTick.QuadPart - nStart) * 1000000 / m_nTimerFrequency)
				  );

	if (m_bMessageBox)
		AfxMessageBox(sPrompt, MB_OK);

	TRACE(sPrompt);

	if (bInterim)
	{		
		SetInterim(); 
		m_nStartTick += (m_nInterimTick - TimerTick.QuadPart);	//adjust start to allow for time elapsed in this function
	}
}

Rip out the bits that you do not like.

Basically if you create an instance of CClassTimer at the top of the function. When the function exits it will trace out how long it took.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

Re: how to measure Time it takes for a function to execute?

Neville Franks18-Nov-04 9:51

Neville Franks

18-Nov-04 9:51

Have a look at Glowcode www.glowcode.com[^] I find its code profiler invaluable.

Neville Franks, Author of ED for Windows www.getsoft.com and Surfulater www.surfulater.com "Save what you Surf"

Re: how to measure Time it takes for a function to execute?

normanS18-Nov-04 18:41

normanS

18-Nov-04 18:41

As long as you can run your program in the visual studio development emvironment, why not use the Profiler? It does a better job than doing gettime(), and is really easy to use. (Look in the Help.)
But on one of my PCs at work, the profiler refuses to run for some reason.

TimeLine control or code

ovo18-Nov-04 2:34

ovo

18-Nov-04 2:34

Hi,

For a project I need to show scheduled items on a timeline(like a Gantt-chart)in a dialog.

I have been searching the web now for a few days but could not find anything useful.
Found only one article that could help me but the code supplied was incomplete (missing lib-file)(article "CTimelineEditor" on Codeguru, author:Jeffrey M. Barber)

Cannot believe I am the first one encountering this 'challenge'. Confused | :confused:

Can anyone please help me finding a solution for my problem?

thanks in advance, Smile | :)

Re: TimeLine control or code

BlackDice18-Nov-04 3:06

How to run an executable program

18-Nov-04 3:06

I would use Chris Maunder's MFCGridCtrl class (found here on CP). It's very modifiable. I was thinking of deriving a class from it just for that purpose that could show timelines for various items.

If I write code in my sleep, does that make me brilliant, or just a lazy programmer?

My articles

www.stillwaterexpress.com

BlackDice - the programmer formerly known as bdiamond

gunnar6618-Nov-04 2:28

gunnar66

18-Nov-04 2:28

Hi
What function do i need to run an exe program. I need to call another exe program from my Visual C prog.

Thanks

BlackDice18-Nov-04 2:33

18-Nov-04 2:33

try ShellExecute()

If I write code in my sleep, does that make me brilliant, or just a lazy programmer?

My articles

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BlackDice - the programmer formerly known as bdiamond

gunnar6618-Nov-04 2:37

gunnar66

18-Nov-04 2:37

Thank you!!

David Crow18-Nov-04 2:39

18-Nov-04 2:39

There's also CreateProcess().

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