float overflow - C / C++ / MFC Discussion Boards

Hamid_RT1-Mar-08 19:58

1-Mar-08 19:58

I didnt try to it but maybe you can run a batch file and on that file write for delete your file and itself when you want to close your program.

Re: A program which can delete itself

zengkun1001-Mar-08 21:15

zengkun100

1-Mar-08 21:15

Thank you! Smile | :)

What you said is one of the many ways to delete a program itself.

A Chinese VC++ programmer

Re: A program which can delete itself

Hamid_RT2-Mar-08 4:48

Hamid_RT

2-Mar-08 4:48

You're welcome.
Smile | :)

Is it possible to create /delete a new user/group using win32 apis

vineeshV1-Mar-08 6:12

vineeshV

1-Mar-08 6:12

in my current project i need to create/delete a user/group using win32 apis ,
is it possible to do so ...If so whats the api i need to call ??

Re: Is it possible to create /delete a new user/group using win32 apis

Mark Salsbery1-Mar-08 8:12

Mark Salsbery

1-Mar-08 8:12

The group and user functions of the Network Management Function[^]
may help.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Is it possible to create /delete a new user/group using win32 apis

vineeshV1-Mar-08 8:58

vineeshV

1-Mar-08 8:58

Thanks mark .....

vineesh

Re: Is it possible to create /delete a new user/group using win32 apis

zengkun1001-Mar-08 21:17

zengkun100

1-Mar-08 21:17

And this great book «Programming Server-Side Applications for Microsoft Windows 2000» will help you a lot.

A Chinese VC++ programmer

float overflow

FredrickNorge1-Mar-08 5:13

FredrickNorge

1-Mar-08 5:13

Hi, i have a variable of type float that get a return value
thats greater than what float or double, long double etc can hold.

The return data does not need to be so precise, example it holds 1.1520230e-007 when it overflows, and i really just
need 1.1520230. However when the variable overflows like this i cant print it, i cant cast it or move it
to a buffer.

Is there a c\c++ function that truncates it, i have tried to cast the return data as type float but no success.
Also i cant pass it to a buffer to then shorten it later as VS ignores the data except in the debug-watch window.

Any ideas are much appreciated.

Regards, Fred

Re: float overflow

Luc Pattyn1-Mar-08 15:33

Luc Pattyn

1-Mar-08 15:33

Hi Fredrick,

sorry, but this does not make much sense.

Overflow is when a number becomes so large the data type can no longer represent it;
it would happen e.g. when you start with one, and keep multiplying by 10.

1.1520230e-007 is not the same as 1.1520230; it is actually 10 million times smaller.

also a number such as 1.1520230e-007 is far away from overflowing either the float or double type.

I suggest you rethink your problem, and/or reformulate what it is you want.

Smile | :)

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This month's tips:
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Interfacing webcam to C++ program to manipulate the images in real time

look4star29-Feb-08 21:45

look4star

29-Feb-08 21:45

Hi all,

I'm really desperate to find out how I could link the webcam to a C++ program as I need to launch it on a real time basis! Is there any interface I could use as I'm really clueless as to how I could do it!

Thank You!

With regards,
Jas

Re: Interfacing webcam to C++ program to manipulate the images in real time

Amar Sutar1-Mar-08 0:40

Amar Sutar

1-Mar-08 0:40

See http://www.codeproject.com/KB/directx/LiveVideo.aspx[^]

Regrads,
Amar Smile | :)

how to create a new process in c

prasadbuddhika29-Feb-08 21:40

prasadbuddhika

29-Feb-08 21:40

i want to create a new process thorugh my programm to simulate 3 lifts.could any one tell me how to create a new process in linux using C

Re: how to create a new process in c

Gary R. Wheeler1-Mar-08 0:55

Gary R. Wheeler

1-Mar-08 0:55

You might want to try searching for a Linux programming site. The Code Project is almost exclusively oriented towards Windows.

Software Zen: delete this;
Fold With Us![^]

Re: how to create a new process in c

Dave Calkins1-Mar-08 3:34

Dave Calkins

1-Mar-08 3:34

try the system() API.

int system(
const char *command
);

I believe thats a standard call available on Windows and Linux.

Re: how to create a new process in c

CPallini1-Mar-08 4:19

CPallini

1-Mar-08 4:19

Of course this is the wrong forum for your question. Anyway, Linux provides fork and execv functions. Have fun with man to find out their usage.
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

Error!!

rowdy_vc++29-Feb-08 20:27

rowdy_vc++

29-Feb-08 20:27

Hai friends

When i create one sample project...
class EDCService :public IFileIO

Service - oneclass
IFileIO -interface class

then, i create instance of the class

EDCService::IFileIO fio;

finallay i compiled...showing below error..please suggest me!!

error C3153: you cannot create an instance of an interface

*****THANKS N ADVANCE****
Mathen.K
(I WILL TRY MY LEVEL BEST )

Re: Error!!

Michael Schubert29-Feb-08 20:44

Michael Schubert

29-Feb-08 20:44

Suggest what?

Re: Error!!

rowdy_vc++29-Feb-08 20:54

rowdy_vc++

29-Feb-08 20:54

How to solve that error?

*****THANKS N ADVANCE****
Mathen.K
(I WILL TRY MY LEVEL BEST )

Re: Error!!

Michael Schubert29-Feb-08 21:01

Michael Schubert

29-Feb-08 21:01

It took me 10 seconds to find this:

http://msdn2.microsoft.com/en-us/library/7d4ezh73(VS.80).aspx[^]

Why don't you try to figure things out for yourself before spamming this board?

Re: Error!!

rowdy_vc++29-Feb-08 21:07

rowdy_vc++

29-Feb-08 21:07

hi michel thanks 2 your replay...Already i try this logic ..wen i add that dll..via
(#using "mscorlib.dll")..

showing this error:

fatal error C1190: managed targeted code requires a '/clr' option

*****THANKS N ADVANCE****
Mathen.K
(I WILL TRY MY LEVEL BEST )

Re: Error!!

manish.patel29-Feb-08 20:57

manish.patel

29-Feb-08 20:57

You are creating object of the Interface IFileIO

rowdy_vc++ wrote:
EDCService::IFileIO fio;

Do this:

EDCService fio;

Is this you want??

Manish Patel.
B.E. - Information Technology.

Re: Error!!

rowdy_vc++29-Feb-08 21:04

rowdy_vc++

29-Feb-08 21:04

yes i try ...but showing this error

error C2259: 'EDCService' : cannot instantiate abstract class

*****THANKS N ADVANCE****
Mathen.K
(I WILL TRY MY LEVEL BEST )

Re: Error!!

manish.patel29-Feb-08 21:17

manish.patel

29-Feb-08 21:17

Do you realy need for IFileIO interface?
If you don't need it then remove it.

What declarations you made inside it?

Manish Patel.
B.E. - Information Technology.

Re: Error!!

manish.patel29-Feb-08 21:25

manish.patel

29-Feb-08 21:25

I tried this::

IFileIO.h

<br />
#pragma once<br />
<br />
interface IFileIO<br />
{<br />
	void setData(int xi);<br />
};

EDCService.h

#pragma once
#include "IFileIO.h"

<br />
class EDCService:public IFileIO<br />
{<br />
public:<br />
	EDCService(){};<br />
	int x;<br />
<br />
	void setData(int xi)<br />
	{<br />
		x = xi;<br />
	}<br />
};

Its works fine for me.

I can create instance like this

EDCService serviceObj;

Try it and let me know how it works

Manish Patel.
B.E. - Information Technology.

Append text to edit control

bhat29-Feb-08 19:37

bhat

29-Feb-08 19:37

Hi

i use SendMessage(hndl,WM_SETTEXT,0,buufer) to send data in the edit control............ every time the program runs it clears the old text from the edit control and writes the new one to it ......but i want to keep the old data in the edit control and appends the new one ......

tHanks in advance

AbidBhat

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