C / C++ / MFC Discussion Boards

toxcct14-Oct-04 19:52

14-Oct-04 19:52

have a look at the functions call stack, the processor registers and so useful debuging tools.

otherwise, if you want some help, post a piece of the crashing code...

TOXCCT >>> GEII power

Re: debugging the break point? :) :)

22491714-Oct-04 21:14

224917

14-Oct-04 21:14

Try creating a mapfile for ur project to get the line number where the app crashes. Check this article.
http://www.codeproject.com/debug/mapfile.asp

There is no spoon.

mail

Re: debugging the break point? :) :)

David Crow15-Oct-04 6:22

David Crow

15-Oct-04 6:22

Anonymous wrote:
The application always crashes at the same address and i cant really trace the condition where this is happening.

Have a look at the project's .map file (you might have to add /map to the linker settings). For example, if you know the program is crashing at address 0x17d28a03, you would look in the .map file for the closest address that is less than this value.

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

Decimal number class

paulb14-Oct-04 19:16

paulb

14-Oct-04 19:16

Does anyone know of a (preferably free) class library that will accurately represent decimal numbers? we have been using floats but these have problems representing certain numbers and are resulting in rounding errors.

Re: Decimal number class

toxcct14-Oct-04 19:50

toxcct

14-Oct-04 19:50

could you explain a bit more ?

i don't understand why you're talking about a class for integers.
don't you want to use signed/unsigned int/short/long ??

TOXCCT >>> GEII power

Re: Decimal number class

paulb14-Oct-04 20:35

paulb

14-Oct-04 20:35

No I mean decimal numbers, like 1.234

float and double are no good at representing certain values (e.g. 0.1)

I need a class that can accruately represent decimal numbers

Re: Decimal number class

Cedric Moonen14-Oct-04 20:49

Cedric Moonen

14-Oct-04 20:49

Instead of float (4 bytes), use double (8 bytes) or long double (10 bytes) if you need even more precision

Re: Decimal number class

toxcct14-Oct-04 22:37

toxcct

14-Oct-04 22:37

did you have a look at float.h ? you certainly didn't.
you will find many "tools" to manage non real values like infinites, resolution loose, and so...

and about your 0.1, i don't understand why float is not good...

TOXCCT >>> GEII power

Re: Decimal number class

jan larsen15-Oct-04 2:34

jan larsen

15-Oct-04 2:34

toxcct wrote:
and about your 0.1, i don't understand why float is not good...

float and double are nice containers for floating point numbers, but they aren't accurate, they can't accurately describe 2 1/3 for example.
While double is ok for most apps, it would be a poor choice for eg. insurance companies where the roundings in the complex actuarial formulas would mean filtering away billions of dollars.

"After all it's just text at the end of the day. - Colin Davies

"For example, when a VB programmer comes to my house, they may say 'does your pool need cleaning, sir ?' " - Christian Graus

Re: Decimal number class

markkuk15-Oct-04 0:06

markkuk

15-Oct-04 0:06

Here's a commercial one: Base One Number Class

Re: Decimal number class

David Crow15-Oct-04 6:25

David Crow

15-Oct-04 6:25

Technically, decimal means base-10 (deca is Greek for ten). So, rather than using a float type, are you wanting to use an int type?

If you simply need more precision, you might try the DECIMAL type. However, I suspect you are not having precision problems. Most beginners assume you can compare floating-point numbers just like you can non floating-point numbers. For example, this would never produce the desired result:

float a = 0.1;
if (a == 0.1)
    ...

because a is stored internally as 0.0999999999, give or take a few 9s.

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

Simple file I/O is giving me trouble

georgiek5014-Oct-04 18:59

georgiek50

14-Oct-04 18:59

I am trying to read the entire content of a text file with the following code:

File.seekg(0, ios::end);<br />
<br />
		long lFileSize = File.tellg();<br />
		<br />
		szFileBuffer = new char[lFileSize + 1];<br />
<br />
		if ( szFileBuffer == NULL )<br />
		{<br />
			MessageBox(NULL, "There is not enough memory to run this application",<br />
				       NULL, MB_ICONERROR | MB_OK);<br />
<br />
			return 1;<br />
		}<br />
<br />
		File.seekg(0, ios::beg);<br />
<br />
		File.get(szFileBuffer, lFileSize + 1, EOF);<br />
<br />
		File.close();

The actual filesize is 715KB but the program is only reading 540KB...tellg gives the correct filesize yet get seems to only be getting 540KB...are there any workarounds for this...in general, are there buffer size limitations as far as istream::get is concerned?

Re: Simple file I/O is giving me trouble

Sujan Christo14-Oct-04 21:24

Sujan Christo

14-Oct-04 21:24

Hi,
Think having some prob with EOF state. Have a look @ msdn for basic_istream::seekg.
This may help you
Sujan

Re: Simple file I/O is giving me trouble

Mad__14-Oct-04 22:22

Mad__

14-Oct-04 22:22

Hi
For reading entire file content, try use block (not stream) i/o.

<br />
FILE *pFile = fopen(fname, fmode); // fmode = "r" for text files and "rb" for binary data<br />
fseek(pFile, 0, SEEK_END);<br />
long len = ftell(pFile);<br />
char *data = new char[len];<br />
fseek(pFile, 0, SEEK_SET);<br />
long rest = len;<br />
long tpos = 0;<br />
while(rest)<br />
{<br />
  long rd = fread(data+tpos, 1, rest, pFile);<br />
  if (!rd)<br />
  {<br />
    // check error<br />
  }<br />
  else<br />
  {<br />
    rest -= rd;<br />
    tpos += rd;<br />
}<br />
fclose(pFile)

Re: Simple file I/O is giving me trouble

David Crow15-Oct-04 7:56

David Crow

15-Oct-04 7:56

How are you opening the file? If the file is opened as "text" then any EOF character encountered before the last one will cause the get() call to end prematurely.

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

Re: Simple file I/O is giving me trouble

georgiek5015-Oct-04 17:11

georgiek50

15-Oct-04 17:11

Thanks for the replies...yes the file is being opened as text...there shouldn't be a premature EOF character in there...but in general, what are my options while keeping this file open as text?

Menu shortcut keys

Imtiaz Murtaza14-Oct-04 18:36

Imtiaz Murtaza

14-Oct-04 18:36

Dear friends,
I am giving "&" symbol to menu items, but at runtime, the Menu item is not underlined. Its only when i press "Alt" key it becomes underlined. I want the "short Key" character to be visible at runtime, just like Visual C++ 6.0 IDE or MS Office. How can i do so ?

Imtiaz

Re: Menu shortcut keys

geo_m14-Oct-04 19:51

geo_m

14-Oct-04 19:51

This is by settings in XP - Screen properties/Appearance - then Effects button and uncheck Hide underlined...

Re: Menu shortcut keys

Imtiaz Murtaza14-Oct-04 19:55

Imtiaz Murtaza

14-Oct-04 19:55

Yes, but how Visual Studio and MS-WORD are showing underline symbol when the option is either selected or not selected ??

Imtiaz

Re: Menu shortcut keys

geo_m14-Oct-04 23:28

geo_m

14-Oct-04 23:28

Because they have their menu ownerdraw and decided for whatever reason to ignore this system setting.
The setting for the system can be retrieved by
function SystemParametersInfo, using flag SPI_GETKEYBOARDCUES.
You can change the setting for the system by using SPI_SETKEYBOARDCUES flag with the mentioned function.

Hope that helps.

analog clock

Mr Bose Dayala14-Oct-04 18:01

Mr Bose Dayala

14-Oct-04 18:01

Hi all,
can anybody gimme the program with code to create a anolog clock.

thanks in advance.
Mr.Dayala

ThomasKennedyBose

Re: analog clock

ThatsAlok14-Oct-04 18:39

ThatsAlok

14-Oct-04 18:39

search for analog clock in c++ section at http://www.planetsourcecode.com

-----------------------------
"I Think It Will Help"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Re: analog clock

Mr Bose Dayala14-Oct-04 19:27

Mr Bose Dayala

14-Oct-04 19:27

hi alok,
thanks for quick reply..I found it in planetsource bit it is on general C++.I want it in VC++..can help me out?? my problem is with time, otherwise I can manage by wriitng myself.

thanks in advance.

ThomasKennedyBose

Re: analog clock

ThatsAlok14-Oct-04 21:14

ThatsAlok

14-Oct-04 21:14

could you eloborate you problem or mail me at thatsalok@gmail.com

-----------------------------
"I Think It Will Help"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Re: analog clock

Ryan Binns14-Oct-04 18:40

Ryan Binns

14-Oct-04 18:40

Mr Bose Dayala wrote:
can anybody gimme the program with code to create a anolog clock.

Probably, but nobody will. Why don't you write it yourself and if you run into any problems, ask a question about how to do a particular thing. You're much more likely to get a useful response that way.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

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