C / C++ / MFC Discussion Boards

Thanks: How to set the End of File to a file opened by "fopen" with "r+"

Sarvan AL11-Jan-06 21:40

11-Jan-06 21:40

I could do it with _chsize function, as Kakan said.
But the file should be opened in "r+" mode, instead of "w".
I have not known the _fileno function to get the handle from FILE object.

Thanks for the valuable reply.

Sarvan AL

-- modified at 3:44 Thursday 12th January, 2006

Re: Thanks: How to set the End of File to a file opened by "fopen" with "r+"

kakan11-Jan-06 22:05

kakan

11-Jan-06 22:05

Hello.

You can change the file size as long as you have the file opened for writing, so "r+" (append) is OK.

The _fileno() function is in the runtime library, so you do have it, for sure. It's declared in stdio.h.
If it's missing, the try using fileno() instead.

Kakan.

Visual studio intellisense

Russell^'11-Jan-06 2:14

Russell^'

11-Jan-06 2:14

How to refresh the intellisense information about functions that are on a file OUTSIDE the project, that is linked using #include?
(delete the file xxx.ncb don't work)

Have a nice code day Wink | ;)

Re: Visual studio intellisense

Owner drawn11-Jan-06 17:09

Owner drawn

11-Jan-06 17:09

_Russell_ wrote:
OUTSIDE

put it INSIDE

Jesus Loves

<marquee direction="up" height="50" scrolldelay="1" step="1" scrollamount="1" style="background:#ffaaaa">
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord

Print image to fit the page

Alberto_Canabal11-Jan-06 2:04

Alberto_Canabal

11-Jan-06 2:04

Hi.
I'm building an MFC app, and at this time trying to add printing facilities.
What i need to do, is to print the image (all the windows of my app show different images) so that it fits the printing page...i've been trying to find the correct calculation (working on OnPrepareDC) with different page/window/screen measures (GetDeviceCaps(...)), but i don't seem to get it.

The pseudo code of OnPrepareDC:

<br />
SuperView::OnPrepareDC(pDC, pInfo);<br />
if (IsPrinting)<br />
{<br />
pDC->SetMapMode(MM_ANISOTROPIC);<br />
CClientDC dc( this );<br />
//This line could be some transform of the ClientRect (??)<br />
CSize szScreen = dc.GetDeviceCaps(...);<br />
//Set the total size...<br />
pDC->SetWindowExt( szScreen );<br />
<br />
CSize szPage = pDC->GetDeviceCaps(...);<br />
CSize szfinal = SOME_CALCULATIONS(szScreen, szPage);<br />
//Set the viewportsize...<br />
pDC->SetViewportExt( szFinal );<br />
}<br />
...<br />

If someone understood the message, and knows something about it...will save my life.

Thanks,
Alberto

Read\Write Registry Keys

KevinSheedy11-Jan-06 2:04

KevinSheedy

11-Jan-06 2:04

What's the siplest way to read from and write to the registry?
Thanks

KevinSheedy

Re: Read\Write Registry Keys

Russell^'11-Jan-06 2:20

Russell^'

11-Jan-06 2:20

CWinApp::WriteProfileString(..)
CWinApp::GetProfileString(..)
CWinApp::WriteProfileInt(..)
CWinApp::GetProfileInt(..)

Have a nice code day Wink | ;)

Re: Read\Write Registry Keys

James R. Twine11-Jan-06 5:18

James R. Twine

11-Jan-06 5:18

Do a search for RegOpenKey - you will likely find usable examples of how to use the registry-related functions.

Peace!

-=- James

If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Tip for new SUV drivers: Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
DeleteFXPFiles & CheckFavorites (Please rate this post!)

MFC or ActiveX equivalent control to VB Dirlist control

srimayank11_codeproject11-Jan-06 2:02

srimayank11_codeproject

11-Jan-06 2:02

Dear All,

Kindly letme know is there any ActiveX or MFC control which is equivalent to DirList Control.

Regards,
Mayank Srivastava

-- modified at 8:03 Wednesday 11th January, 2006

How to crash my programe before main()?

vikas amin11-Jan-06 0:51

vikas amin

11-Jan-06 0:51

Ok very popular question
how do i crash my programe before reaching main.
I dont actually want to crash the programe but
want to know how can i execute a piece of code
before main is executed .
Consider C and C++ only
Answer shoud be compiler independent

Cool | :cool:

Vikas Amin
Embin Technology
Bombay

Re: How to crash my programe before main()?

Anilkumar K V11-Jan-06 1:01

Anilkumar K V

11-Jan-06 1:01

create any gloabl object, in ur program. put some code to crash in its constructor

Kill before even born....Its is called abortion!!! Laugh | :laugh:

-- modified at 7:14 Wednesday 11th January, 2006

Re: How to crash my programe before main()?

vikas amin11-Jan-06 1:51

vikas amin

11-Jan-06 1:51

What about C ???
this is c++ Cool | :cool:

Vikas Amin
Embin Technology
Bombay

Works for programs written in any language!

Taka Muraoka11-Jan-06 1:02

Taka Muraoka

11-Jan-06 1:02

Patch random bytes in the EXE until you find something that works Hmmm | :|

The two most common elements in the universe are Hydrogen and stupidity. - Harlan Ellison

Awasu 2.2 [^]: A free RSS/Atom feed reader with support for Code Project.

Re: How to crash my programe before main()?

lemur211-Jan-06 1:41

lemur2

11-Jan-06 1:41

Of the top of my head, can't think of a way in C, but in C++ you can simply use some form of static initialiser.

Be warned though, that they can cause problems if not handled correctly. I'd recommend asking yourself if you really need to do this?

Kev

Re: How to crash my programe before main()?

vikas amin11-Jan-06 1:54

vikas amin

11-Jan-06 1:54

Pls elaborate "Static initialiser ".

Small code can be of help.

Vikas Amin
Embin Technology
Bombay

Re: How to crash my programe before main()?

Rajesh R Subramanian11-Jan-06 1:47

Rajesh R Subramanian

11-Jan-06 1:47

1. Get yourself a sledge hammer
2. Take a deep breath
3. Swing the hammer back and give the program (The display, where it is being shown) a merciless blow.
4. The program should have crashed by now.

Big Grin | :-D

This is a code sample

<br />
#include<iostream><br />
using namespace std;<br />
<br />
class GoGoGo<br />
{<br />
  public:<br />
    GoGoGo() <br />
    { <br />
      cout << "This runs first!";<br />
      //put ur code to crash the program here..<br />
    } BeFirst;<br />
}<br />
<br />
int main()<br />
{<br />
  cout << "Main is second :(";<br />
  return 0;<br />
}<br />

Google for interview questions and u will find a lot of stuff. I learned this from google some months back.

Regards,
Rajesh R. Subramanian

You have an apple and me too. We exchange those and We have an apple each.
You have an idea and me too. We exchange those and We have two ideas each.

Re: How to crash my programe before main()?

vikas amin11-Jan-06 1:51

vikas amin

11-Jan-06 1:51

What about C ???
this is c++

Vikas Amin
Embin Technology
Bombay

Re: How to crash my programe before main()?

lemur211-Jan-06 1:55

lemur2

11-Jan-06 1:55

You need to declare an instance of class GoGoGo before this will work - i.e.:
GoGoGo executesBeforeMain;

Kev

Re: How to crash my programe before main()?

sunit511-Jan-06 3:24

sunit5

11-Jan-06 3:24

It has to be

class GoGoGo<br />
{<br />
public:<br />
GoGoGo()<br />
{<br />
cout << "This runs first!";<br />
//put ur code to crash the program here..<br />
}<br />
}BeFirst;

never say die

Re: How to crash my programe before main()?

Rajesh R Subramanian11-Jan-06 19:37

Rajesh R Subramanian

11-Jan-06 19:37

Sorry abt that. Din notice it.

You have an apple and me too. We exchange those and We have an apple each.
You have an idea and me too. We exchange those and We have two ideas each.

Re: How to crash my programe before main()?

Cedric Moonen11-Jan-06 1:59

Cedric Moonen

11-Jan-06 1:59

int CrashingFunc();<br />
<br />
static int SomeIntThatCrashesTheProg = CrashingFunc();<br />
<br />
int CrashingFunc()<br />
{<br />
    // Put crashing code here<br />
}

The static variables will be evaluated first and this will call your CrashingFunc before the main()

Re: How to crash my programe before main()?

sunit511-Jan-06 3:21

sunit5

11-Jan-06 3:21

is it neccesary to put static .

static int SomeIntThatCrashesTheProg = CrashingFunc();<br />
<br />
int CrashingFunc()<br />

I feel int SomeIntThatCrashesTheProg has to be Global which u have defined with static

never say die

-- modified at 9:27 Wednesday 11th January, 2006

Re: How to crash my programe before main()?

vikas amin11-Jan-06 19:36

vikas amin

11-Jan-06 19:36

yeh globals
if they are initalised then
they can crash the prog .
Blush | :O

Vikas Amin
Embin Technology
Bombay

Re: How to crash my programe before main()?

vipinasda11-Jan-06 6:41

vipinasda

11-Jan-06 6:41

Why do you want to do so? Can you tell the usability?

Vipin - MVP

Re: How to crash my programe before main()?

vikas amin11-Jan-06 19:34

vikas amin

11-Jan-06 19:34

Actually i dont want to crash the
program but i am studying the reason
by which the programs can crash before
the main function is exectuted

Vikas Amin
Embin Technology
Bombay

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