C / C++ / MFC

Re: help needed for encoding / saving "*.raw" images.

3-Feb-09 5:52

You've got access to the source, haven't you? That should make writing a raw image saver simple enough.

Saurabh.Garg3-Feb-09 16:34

Saurabh.Garg

3-Feb-09 16:34

I might be wrong but it doesn't makes sense to write an image back to raw format. Raw file is supposed to contain the raw unprocessed data from a camera. If you process it then its no longer raw data, and you shouldn't save to as raw format.

-Saurabh

Re: help needed for encoding / saving "*.raw" images.

Hamid_RT3-Feb-09 20:59

Hamid_RT

3-Feb-09 20:59

See here[^] for more info about RAW file format.

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Euler's Contant To The X Power

little_missy3-Feb-09 2:11

little_missy

3-Feb-09 2:11

How do you make a program in C++ that computes for this:

e^x = 1 + (x/1!) + ([x^2]/2!) + ([x^3]/3!) + ... + ([x^n]/n!)

where e is the euler's contant, x is the input

there should be 500 addends (so n = 499)

Thank you Big Grin | :-D

toxcct3-Feb-09 2:34

toxcct

3-Feb-09 2:34

#include <cmath>
 
::exp(x);

also, you could have a look here[^]

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

little_missy3-Feb-09 23:53

little_missy

3-Feb-09 23:53

I don't understand what I have to do with the link you gave me. I really need this tonight. Please please please help me. I'm a noob in C++

toxcct4-Feb-09 0:02

toxcct

4-Feb-09 0:02

I gave you the solution to get it calculated easily, by using the exp() function.

the link was an additional tip to see it used in a real context.

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

cmk3-Feb-09 6:09

cmk

3-Feb-09 6:09

You need to use a bignum library to calc the large exponents/factorals and maintain precision.

http://en.wikipedia.org/wiki/Arbitrary-precision_arithmetic[^]

...cmk

The idea that I can be presented with a problem, set out to logically solve it with the tools at hand, and wind up with a program that could not be legally used because someone else followed the same logical steps some years ago and filed for a patent on it is horrifying.
- John Carmack

Luc Pattyn3-Feb-09 6:21

Luc Pattyn

3-Feb-09 6:21

Hi,

this is elementary.

as always, express each term of the series as a product of the previous term and some factors;
that will give you:
- the most efficient way to perform the calculations
- the fact that the terms decrease as soon as n exceeds x
- a reasonable test for early termination of the series (for small x that is)

there is no need for special libraries, just use doubles.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

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cmk3-Feb-09 21:12

cmk

3-Feb-09 21:12

(S)He stated (s)he wants to expand to ~500.
(S)He will likely exceed the precision of a double by the mid teens.

keyboard event

hrishiS3-Feb-09 1:18

hrishiS

3-Feb-09 1:18

Hi everyone...
Could anyone please tell me how to check for an keyboard event in win32 consol application...
I have an while loop
while(1)
{
}

I need to check each time if I have pressed a particular key....say "h"

Thanks in advance

I am a learner Always

CPallini3-Feb-09 1:40

CPallini

3-Feb-09 1:40

Are you looking for this [^]?
Smile | :)

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]

hrishiS3-Feb-09 1:46

hrishiS

3-Feb-09 1:46

thanks...
But those are blocked call.....I want something like this...
My while loop keeps running.....and it checks for a key...if it was pressd it exits....But if it wasnot pressed also, my while loop keep running(iterating..)
Basically i need a nonblocking function....asynchronous

Thanks

I am a learner Always

CPallini3-Feb-09 2:05

CPallini

3-Feb-09 2:05

See here [^].
Smile | :)

Stuart Dootson3-Feb-09 2:06

3-Feb-09 2:06

You could try using _kbhit[^].

Nibu babu thomas3-Feb-09 2:03

Nibu babu thomas

3-Feb-09 2:03

himangshuS wrote:
I need to check each time if I have pressed a particular key....say "h"

Use _kbhit() in combination with getch().

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Platform SDK: Get domain name

hrishiS3-Feb-09 2:42

hrishiS

3-Feb-09 2:42

thanks...

I am a learner Always

Stefan Spenz3-Feb-09 1:18

Stefan Spenz

3-Feb-09 1:18

I need to get the domain name for the currently logged on user.
::GetUserName gets me the user name, but how do I get the domain name for that user?

Thanks!

Re: Platform SDK: Get domain name

Supriya Tonape3-Feb-09 1:43

Supriya Tonape

3-Feb-09 1:43

With, Win32_LogonSession you will get 'LogonId' use this logonId to query the Win32_LoggedOnUser. After querying 'Win32_LoggedOnUser' you will get all the fields, like - Domain, Name etc

Supriya

Re: Platform SDK: Get domain name

Stuart Dootson3-Feb-09 1:59

Re: Platform SDK: Get domain name

3-Feb-09 1:59

Use NetWkstaUserGetInfo[^] and retrieve level 1 information, as below. Requires Windows NT 3.1, 2000, XP, Vista.

#include <Windows.h>
#include <lm.h>

std::wstring GetDomainName()
{
   WKSTA_USER_INFO_1* workstationInfo;
   const NET_API_STATUS status = NetWkstaUserGetInfo(NULL, 1, (LPBYTE*)&workstationInfo);
   if (status == NERR_Success)
   {
      return workstationInfo->wkui1_logon_domain;
      NetApiBufferFree((LPBYTE*)&workstationInfo);
   }
   return std::wstring();
}

krmed3-Feb-09 2:01

krmed

3-Feb-09 2:01

Another option is the environment variables USERDNSDOMAIN and USERDOMAIN.

Hope that helps.

Karl - WK5M
PP-ASEL-IA (N43CS)
PGP Key: 0xDB02E193
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Memory Leaks With CString in vc6.0 in Release mode

Ramasani3-Feb-09 1:05

Ramasani

3-Feb-09 1:05

I am facing a run time problem with the CString in Release builds in vc6.0
i observed that the memory wont be released for cstring object i checked in the task manager can any one help for this here i posted the code also

#include "stdafx.h"
#include "afx.h"
#include "afxwin.h"

#include <windows.h>
#include "fixalloc.h"

#pragma warning (disable:4786)
#pragma warning (disable:4503)
#include<list>
#include<string>
#include<vector>

using namespace std;

#include <afxtempl.h>

void test()
{
vector<CString> stldmlist;
CString a;

FILE *fp=fopen("E:\\log1.txt","r");
char str[1000];

while(!feof(fp))
{
fscanf(fp,"%s\n",str);
a=str;
stldmlist.push_back(a);
}
fclose(fp);

AfxMessageBox("Memory");
}

UINT32 main(int argc, char* argv[])
{
CString obj;
AfxMessageBox("Start ");
test();
AfxMessageBox("End");
return 1;
}

Hi this Ravinder

Re: Memory Leaks With CString in vc6.0 in Release mode

Stuart Dootson3-Feb-09 1:12

Re: Memory Leaks With CString in vc6.0 in Release mode

3-Feb-09 1:12

Ramasani wrote:
memory wont be released for cstring object i checked in the task manager

Given that task manager doesn't tell you if objects released memory or not, I presume you were looking at an process's working set...

The behaviour I'm guessing you're talking about (the process's working set rising and not falling after test exits) is to be expected - when you start allocating memory, the C runtime requests large chunks of memory from the Windows memory manager. It will not necessarily bother releasing them when you release objects, as allocating and releasing memory with the Windows memory manager is quite expensive.

Ramasani3-Feb-09 1:21

Ramasani

3-Feb-09 1:21

if i go for more number of CString calls it returns memory leak errors(no memory) is there any patches available for this? i need very urgent.

Hi this Ravinder

Re: Memory Leaks With CString in vc6.0 in Release mode

Stuart Dootson3-Feb-09 2:03