C / C++ / MFC Discussion Boards

Re: C Compilers which one to choose for performance

Joe Woodbury23-Oct-10 11:34

23-Oct-10 11:34

Borland C+ is awful; it does almost no real optimizations for modern CPUs and the IDE is extremely flaky and dated. For general use, Visual Studio Express is hard to beat. It has a damn good compiler, second only to Intel's compiler in quality of code, but vastly superior in overall tool awesomeness (the Visual Studio debugger is fabulous.) gcc is third, but their tools reek. Nothing else is worth the time or effort.

Re: C Compilers which one to choose for performance

Aescleal21-Oct-10 23:27

Aescleal

21-Oct-10 23:27

The most sensible thing to do is try them and see which ones generates the best code for your problem on whatever system they have to run on. Most manufacturers (e.g. Intel and Microsoft) produce free compilers which will be good enough for evaluating how they perform.

Cheers,

Ash

Re: C Compilers which one to choose for performance

Paul Michalik23-Oct-10 22:53

Paul Michalik

23-Oct-10 22:53

By the way, are you looking for a C or for a C++ compiler? People are giving you advices regarding C++ compilers and you are persistently talking of a "C compiler". While each C++ compiler must be able to process C-code and generate C-code binaries, there might be specialized C-compilers for generating fast C-binaries...

Re: C Compilers which one to choose for performance

Anurag Gandhi24-Oct-10 0:52

Anurag Gandhi

24-Oct-10 0:52

paul_71 wrote:
While each C++ compiler must be able to process C-code and

You are right paul. Actually, I am looking for fastest free C compiler only, but C++ is also acceptable as it can also compile C code.

As you mentioned, specialized C compiler for generating fast/best optimized binaries would be the best for me.

Anurag Gandhi.
http://www.gandhisoft.com
Life is a computer program and every one is the programmer of his own life.
My latest article: Group GridView Data

Exception occur sometime when i m trying to stop thread.

Le@rner21-Oct-10 21:53

Le@rner

21-Oct-10 21:53

Hi all,

when i m trying to stop running thread ,than some time exception occur and point out on this location in call stack

>	test.exe!CMapPtrToPtr::GetNextAssoc(__POSITION * & rNextPosition=0xfeeefeee, void * & rKey=0xfeeefeee, void * & rValue=0xfeeefeee)  Line 294	C++

i dont understand whats going wrong please help me for this.

thanks in advance.

Re: Exception occur sometime when i m trying to stop thread.

Aescleal21-Oct-10 22:04

Aescleal

21-Oct-10 22:04

IIRC when you see an object with the bit pattern 0xfeeefeee in VC++ it means the object's been deleted. So my first guess would be you've got a map and and you're trying to delete it twice, or trying to use it for something after it's been deleted.

Cheers,

Ash

Re: Exception occur sometime when i m trying to stop thread.

David Crow22-Oct-10 2:55

David Crow

22-Oct-10 2:55

Are you trying to stop thread A from within itself, or from some other thread?

"One man's wage rise is another man's price increase." - Harold Wilson

"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

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Re: Exception occur sometime when i m trying to stop thread.

Le@rner22-Oct-10 19:38

Le@rner

22-Oct-10 19:38

i m doing like this.

class CTimerTh :: CWinThread
{
	//in this class use timer function for threads
}

class CMy_Th::CTimerTh
{
	//this is my thread class where i m perforing some action
}

//i create thread with AfxBeginThread and use here CMy_Th as run time class and and save its return pointer in std::map<int, CMy_Th*> ass

//use like this

ass[0] = (CMy_Th*) AfxBeginThread( RUNTIME_CLASS(CMy_Th),THREAD_PRIORITY_NORMAL, NULL,CREATE_SUSPENDED,
NULL);


//i stop the thread like this

	std::map<int, CMy_Th*>::iterator pos = ass.find(0);
	if(pos != ass.end())
	{
		if(pos->second!=NULL)
		{
			CMy_Th* pThread = pos->second;
			pThread->PostThreadMessage(WM_QUIT,NULL,NULL);
		}

		ass.erase(pos);
	}
</pre>

please me to resolve the error.

thanks in advance.

Re: Exception occur sometime when i m trying to stop thread.

David Crow23-Oct-10 3:47

David Crow

23-Oct-10 3:47

Le@rner wrote:
pThread->PostThreadMessage(WM_QUIT,NULL,NULL);

See here. I prefer to let threads kill themselves, and use events to signal between them.

How can set some minimum size of SDI application?

Le@rner21-Oct-10 21:16

Le@rner

21-Oct-10 21:16

hi all,

i m working on SDI type application ,i want to set some minimum size of application.

please tell me how can i do this.

thanks in advance

Re: How can set some minimum size of SDI application?

Hans Dietrich21-Oct-10 21:59

Hans Dietrich

21-Oct-10 21:59

Le@rner wrote:
i m working on SDI type application ,i want to set some minimum size of application.

In your CMainFrame class, you could implement a handler for WM_GETMINMAXINFO like this:

void CMainFrame::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI) 
{
    int min_x = ::GetSystemMetrics(SM_CXSCREEN) / 4;
    int min_y = ::GetSystemMetrics(SM_CYSCREEN) / 3;

    int cx = lpMMI->ptMinTrackSize.x;
    int cy = lpMMI->ptMinTrackSize.y;
    lpMMI->ptMinTrackSize.x = (cx < min_x) ? min_x : cx;
    lpMMI->ptMinTrackSize.y = (cy < min_y) ? min_y : cy;

    CFrameWnd::OnGetMinMaxInfo(lpMMI);
}

This example will give you a minimum of 1/4 the screen width and 1/3 the screen height. You could also use hard-coded number of pixels, although this might not scale well for different monitor sizes.

Best wishes,
Hans

[Hans Dietrich Software]

Re: How can set some minimum size of SDI application?

Le@rner21-Oct-10 22:34

Le@rner

21-Oct-10 22:34

thanks

Re: How can set some minimum size of SDI application?

GAJERA21-Oct-10 22:11

GAJERA

21-Oct-10 22:11

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
if( !CFrameWnd::PreCreateWindow(cs) )
return FALSE;

cs.cy = 100;
cs.cx = 100;

return TRUE;
}
You can set your custom size with use of cs.cy and cs.cx parameter

How can calculate time taken by any function?

Le@rner21-Oct-10 19:56

Le@rner

21-Oct-10 19:56

Hi all,

i want to calculate time that is taken by execute a function.

i m doing it like this.

DWORD dw = ::GetTickCount();

//calling function

dw = ::GetTickCount() - dw;

CString time_str;
time_str.Format("%d ms", dw);
AfxMessageBox(time_str);

is it right way to do this.

thanks in advance.

Re: How can calculate time taken by any function?

Peter_in_278021-Oct-10 20:21

Peter_in_2780

21-Oct-10 20:21

You can get much better resolution with the APIs QueryPerformanceCounter() and QueryPerformanceFrequency(). Use ...Counter much like you use GetTickCount, and ...Frequency to calibrate your results. Hit MSDN for more info and examples.

Software rusts. Simon Stephenson, ca 1994.

How to write a existing bigger binary file into small/compact binary file in C.

cancerion21-Oct-10 19:42

cancerion

21-Oct-10 19:42

I have a binary file of size 3GB. I want to reduce the size using some coding in C to write another binary file.

Please suggest/provide a way to write compact binary file.

TO read this file i need to use C#.

Thanks,
Sachin

Re: How to write a existing bigger binary file into small/compact binary file in C.

ghle21-Oct-10 20:04

ghle

21-Oct-10 20:04

WinZip(3GB_Filename, 2GB_Filename);

Seriously, it depends on what is contained in the 3GB binary file. Is it even compressible?

If it contains lots of NULLS, for example, change the NULL bytes to a single NULL followed by a count of how many there are. A string of 10 NULLS would turn into a single NULL and a byte with the number 10 in it, saving 8 bytes.

Reading the file in, you would simply reverse the process.

1,2,3,4,5,0,0,0,0,0,0,0,0,0,0,1,2,3,a,b,c,0,0,0,0,d,e,0,f,ff
(30 bytes)

Becomes
1,2,3,4,5,0,a,1,2,3,a,b,c,0,4,d,e,0,1,f,ff
(21 bytes)

Alternatively, implement one of the Open Source Zip and Unzip routines in your C and C# code, as appropriate.

Gary

Re: How to write a existing bigger binary file into small/compact binary file in C.

GAJERA21-Oct-10 21:03

GAJERA

21-Oct-10 21:03

check this library.
http://zlib.net/[^]

use following function from library for compress binary file.
deflateInit
deflate
deflateEnd

Re: How to write a existing bigger binary file into small/compact binary file in C.

Aescleal21-Oct-10 21:39

Aescleal

21-Oct-10 21:39

I've used (libbzip2[^]) in the past with some success at shrinking certain types of binary file. Hopefully there's some repetition in it or whatever you try isn't going to be able to do much to shrink it.

Cheers,

Ash

Re: How to write a existing bigger binary file into small/compact binary file in C.

rp_suman22-Oct-10 1:04

rp_suman

22-Oct-10 1:04

Hope below links will help you:

fastest c++ file compression library available[^]

Cabinet File (*.CAB) Compression and Extraction[^]

--
"Programming is an art that fights back!"

Error : can not open file "hid.lib"

Ruchira Patel21-Oct-10 18:56

Ruchira Patel

21-Oct-10 18:56

fatal error LNK1104: cannot open file "hid.lib"

please give me any solution.

Re: Error : can not open file "hid.lib"

rp_suman21-Oct-10 19:44

rp_suman

21-Oct-10 19:44

Ruchira Patel wrote:
fatal error LNK1104: cannot open file "hid.lib"

Check if the file mentioned in the error message("hid.lib") is present or not.
If the file is in some 3rd party libraries installed in system, give the correct path in "Additional include directories" option of your project settings.

--
"Programming is an art that fights back!"

Re: Error : can not open file "hid.lib"

Cedric Moonen21-Oct-10 20:27

Cedric Moonen

21-Oct-10 20:27

rp_suman wrote:
give the correct path in "Additional include directories"

This is a library file, not an include file. The folder should be mentionned in "Additional Library Directories".

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

Re: Error : can not open file "hid.lib"

rp_suman22-Oct-10 0:46

rp_suman

22-Oct-10 0:46

i've actually meant library path only.. thanks for the correction..

regards

--
"Programming is an art that fights back!"

Re: Error : can not open file "hid.lib"

Cedric Moonen21-Oct-10 20:25

Cedric Moonen

21-Oct-10 20:25

Make sure this file exist on your system and can be found by the compiler (it should either be in the project directory or located in one of the "Additional Library Directory" (project settings -> "Linker" -> "General" -> "Additional Library Directory").

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

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