Re: Disable esc key exit for MFC Application - C / C++ / MFC Discussion Boards

Execution Speed of C++ in different circumstances!!!! [modified]

auto98178-Aug-09 11:46

8-Aug-09 11:46

Hi everyone!!

I have a scientific C++ program which requires a good speed to run.(the program runs a lot of matrix and vector operations)

For doing that, I come across following options on the net:

1. Use of turbo C++
2. Use of Linux instead of window XP

My current system uses Dev C++ over Window XP.

Can I expect some speed increase using above options?
If so, would it be significant?

Thanks

modified on Saturday, August 8, 2009 5:55 PM

Re: Execution Speed of C++ in different circumstances!!!! [modified]

Moak8-Aug-09 12:46

Moak

8-Aug-09 12:46

auto9817 wrote:
Can I expect some speed increase using above options?
If so, would it be significant?

I did read that the Intel compiler creates "best" (here in the meaning of fastest) code on Intel processors, compared to Microsoft's VC and GCC. Never used it myself and I don't have a link to an up-to-date statistics, Wikipedia mentions something about optimizations[^].
However, design and architecture improvements can give more dramatic improvements, e.g. reduce complexity in algorithms, profile for bottlenecks, rewrite for parallel processing on CPUs with multiple cores, outsource matrix operations to GPU... to name some possibilities. Those things are outside the possibilities of a compiler (automated tool) but could be worth to check.

Turbo C++ still exists? Smile | :)

Hope it helps.

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modified on Saturday, August 8, 2009 6:52 PM

Re: Execution Speed of C++ in different circumstances!!!!

Maximilien9-Aug-09 1:47

Maximilien

9-Aug-09 1:47

I would first suggest using VS2008 compiler (which I believe you're not using) first; then
if you have the time and money, try the Intel compiler, it might be a little bit faster
in some operations, especially ones where the use of specific CPU hardware instruction codes
(SSE, ...)

If your matrix and vector operations work on large scale matrices, I would highly suggest
investing the in the Intel compiler AND the Intel MKL (math kernel library)

This signature was proudly tested on animals.

Disable esc key exit for MFC Application

swinder8-Aug-09 9:11

swinder

8-Aug-09 9:11

Hi experts,

I have an Application in MFC using single dialog window.

Problem i am facing is, it exits when i press escape key.

i want it to exit when i press "Exit" button that i made my self and also by pressing "x"(default close button provided in dialog) button on top right corner of window but not by "esc" key.

I tried emptying the implementation of "OnCancel" function. It solves the problem of "esc" key, but it also disables, exit when i press "x" button.

Please help me, it is very annoying when i accidentally press exit and window goes away.

If possible, tell me way to add, minimize button along with "x"(close) button on the top.

Regards,
Swinder....

Re: Disable esc key exit for MFC Application

Code-o-mat8-Aug-09 9:43

Code-o-mat

8-Aug-09 9:43

Add an OnSysCommand[^] handler that watches for SC_CLOSE and calls __super::OnCancel() when it hits.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: Disable esc key exit for MFC Application

David Crow8-Aug-09 11:38

David Crow

8-Aug-09 11:38

See here.

"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

Re: Disable esc key exit for MFC Application

jon_fallon9-Aug-09 2:45

jon_fallon

9-Aug-09 2:45

David,

That FAQ answered many other questions. Thanks for its post.

Re: Disable esc key exit for MFC Application

jon_fallon9-Aug-09 2:44

jon_fallon

9-Aug-09 2:44

Also, one use use PreTranslateMessage to intercept the ESC key. Add the function to the dialog using the class wizard, then check for the ESC key.

BOOL CDxf2NastranDlg::PreTranslateMessage(MSG* pMsg) <br />
{<br />
	// TODO: Add your specialized code here and/or call the base class<br />
	// ESC key<br />
	if(pMsg->wParam == VK_ESCAPE) { return TRUE; }<br />
<br />
	return CDialog::PreTranslateMessage(pMsg);<br />
}<br />

Read Text File line be line....

spalanivel8-Aug-09 8:23

spalanivel

8-Aug-09 8:23

Hi,
I want to read Text File line by line and code follows;(with out using the << operator and char buffer)

ifstream Textfile;
Textfile.open(strFilePath,ios::in);
string value;
while(!Textfile.eof())
{
getline(Textfile,value);
}
Textfile.close();

When i am compiling the above code it throws the error as

error C3861: 'getline': identifier not found, even with argument-dependent lookup

How to rectify this error.. Any other sample Code??

reg,
Subbu

Re: Read Text File line be line....

PJ Arends8-Aug-09 9:23

PJ Arends

8-Aug-09 9:23

Did you #include <string>?

Also, basic_istream has a member getline(), maybe try using that one?

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good - Use it!

Re: Read Text File line be line....

dybs9-Aug-09 16:20

dybs

9-Aug-09 16:20

Make sure you're including a using namespace std; line as well.

Dybs

Status bar, owner-draw theme background?

Moak8-Aug-09 8:15

Moak

8-Aug-09 8:15

Hi, is it possible to draw the background of a status bar with UxTheme.dll? I was browsing through available XP Visual style controls[^], but can't find the status bar background.

Thanks for any help. I looked into existing articles here at CodeProject, which usually derive from CStatusBar (to get the background) and then extend it. I like to find out if it's possible to make an owner-draw control without using the standard status bar control at all.

Cheers!

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Re: Status bar, owner-draw theme background?

enhzflep9-Aug-09 1:59

enhzflep

9-Aug-09 1:59

Is this any use? Status Bars[^]

Re: Status bar, owner-draw theme background?

Moak9-Aug-09 2:35

Moak

9-Aug-09 2:35

Thanks but my question is not about subclassing.

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Re: Status bar, owner-draw theme background?

kilt11-Aug-09 6:28

kilt

11-Aug-09 6:28

Yes, it works like for all controls, with DT
(see on Win32 ng[^] for code, in C/Win32)

help with code from C# to C++/CLI

iozk8-Aug-09 4:43

iozk

8-Aug-09 4:43

hi i try to convert code but i dont know how put bass in the code C# to C++ by example here

class NAME() : base();
{
bla.item;
}

base.item;

how i can pass it to C++

and the variables private in C# repeat the private keyword

private variable1;
private variable2;

in C++ its the same way do this?

private:
variable1;
variable2;

Re: help with code from C# to C++/CLI

Dave Doknjas8-Aug-09 13:12

Dave Doknjas

8-Aug-09 13:12

That is not C# code.
Can you re-state your example?

David Anton
http://www.tangiblesoftwaresolutions.com
Convert VB to C#, C++, or Java
Convert C# to VB, C++, or Java
Convert C++ to C#, VB, or Java
Convert Java to C#, C++, or VB

Right Data in traditional Chinese but not in Simplified chines.

gothic_coder8-Aug-09 3:56

gothic_coder

8-Aug-09 3:56

Can anyone tell me why i receive right data in case of traditional chinese but not in Simplified Chinese... I'm searching and experimenting "How to display right data in GUI" in case of "Simplified Chinese Character", But nothing seems to work..

So i just need to know why my applications(Non Unicode) is able to display right data in GUI in case of traditional chinese, but not in simplified chinese?

P.S
I'm reading data from text files, which are encoded in UNICODE.

Thanks.

disply

sreenivascnu8-Aug-09 0:18

sreenivascnu

8-Aug-09 0:18

i want the answer plzzzz

how to display the signal image in VC++

Re: disply

Super Lloyd8-Aug-09 0:23

Super Lloyd

8-Aug-09 0:23

But... is it URGENTZZZ ?

A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
_________________________________________________________
My programs never have bugs, they just develop random features.

Re: disply

Code-o-mat8-Aug-09 5:07

Code-o-mat

8-Aug-09 5:07

Please read this[^], especially point 2 and 3, and try to obey them, otherwise, don't expect any usefull answers...

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Virtual Driver Development

Sipder7-Aug-09 20:50

Sipder

7-Aug-09 20:50

Hello, I have got an project to develop Virtual Printer Drivers, I am searching for all the information for the same. We have no previous development experience so I need some points to be clarified whether I am right or wrong
1. Virtual Drivers can be created only using MFC/C++. No need to code for any hardware access.

2. No ready made libraries are available online other than WDM.H

3. Device drivers are totally different than Virtual Drivers, no use of reading about Device drivers.

4. Kernal level programming is needed or not?

Kindly answer if any one knows about the same. I am not able to get any help by Googling.

Re: Virtual Driver Development

Super Lloyd8-Aug-09 0:28

Super Lloyd

8-Aug-09 0:28

My Google skills lead me to that[^].

Problem with use of Mutex and System Tray Icon Together.

Le@rner7-Aug-09 19:03

Le@rner

7-Aug-09 19:03

Hi all,

I m working on SDI type Application, Here i m Using Mutex to prevent multiple instances of my exe.

i m using this code for mutex.

HANDLE hMutex = ::CreateMutex(NULL, TRUE, _T("_315FrYu76A_GlobalMainMutex__315FrYu76A"));
	switch(::GetLastError())	
         {
		case ERROR_SUCCESS:
		  // Mutex created successfully. There is no instance running
		  break;

		case ERROR_ALREADY_EXISTS:
		  // Mutex already exists so there is a running instance of our app.
		return FALSE;

		default:
		  // Failed to create mutex by unknown reason
		 return FALSE;
	  }

for system tray icon i m taking help of this article.

Adding Icons to the System Tray[^]

My problem is that if application is already running and its in hide mode and icon present in system tray,now when i click on my exe than its not open becoz of mutex.

i want when application is already running or its hide than if i click on exe than the hide application show.

please tell me how can i do this.

if possible please explain me with any example .

thanks in advance.

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

Re: Problem with use of Mutex and System Tray Icon Together.

«_Superman_»7-Aug-09 19:25

«_Superman_»

7-Aug-09 19:25

First store the main window handle somewhere like in the registry so that every other instance can access it. When the CreateMutex returns ERROR_ALREADY_EXISTS, you could check if the main window is visible using IsWindowVisible[^] and show it.

Or

You can have one thread wait on an event handle. When the CreateMutex returns ERROR_ALREADY_EXISTS, just set this event and the thread waiting on the handle can show the window.

«_Superman_»
I love work. It gives me something to do between weekends.

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