Re: Seekg problem in text file? - C / C++ / MFC Discussion Boards

Re: Debug without other threads stopped!

reza matinnejad14-Feb-07 20:34

reza matinnejad

14-Feb-07 20:34

I want to set a breakpoint and debug one thread without other threads being stopped?

Re: Debug without other threads stopped!

Waldermort14-Feb-07 22:52

Waldermort

14-Feb-07 22:52

AFAIK this is not possible. Threads usually send and share information between each other. If one thread has been stopped, it could very well cause the other thread to crash.

Perhaps you should consider using processes rather than threads.

Re: Debug without other threads stopped!

reza matinnejad14-Feb-07 22:57

reza matinnejad

14-Feb-07 22:57

I am using a DLL in my program which checks a hardware periodically. When i am debugging my application,DLL reset the state of the hardware because of the pause time. Then i want DLL threads to run normally as i am debugging other threads!

Re: Debug without other threads stopped!

Waldermort14-Feb-07 23:12

Waldermort

14-Feb-07 23:12

Like I suggested in my last post, use processes not threads.

Create a process which loads your dll and does all the hardware monitoring. Create another process which handles events. When something happens with the hardware, use "inter process communication" to notify your other process.

Seekg problem in text file? [modified]

Vishvanathan14-Feb-07 19:33

Vishvanathan

14-Feb-07 19:33

Hi,

I am working in text file application.In that application, to opening the file in read only mode like
fstream lpFile;
lpFile.open ( "sample.txt", ios::in );

then i read the file using this file pointer and some times , i move the pointer back to 1 position from current position using seekg ( -1, ios::cur ).

Text file size : 15 KB

Problem:

I couldn't move the file pointer to back using seekg function ( in some case only).I tried to clear the error flag if any before the seekg function. but no result.The problem still continue...
lpFile.clear ( );
lpFile.seekg ( -1, ios::cur );

Sample Text File:
[General]
To read the file information
like name,address,mobile number
[Address1]
Name=vichu
Address=India
Mobile=+919994445550
[Address2]
...
[Addressn]
Name=vishva
Address=chennai
mobile=100

****end of file-----
this is raw text file.

program code:
char chData;
lpFile.get ( chData );
while ( chData != '[' )
{
...
...
}

lpfile.clear ( );
lpFile.seekg ( -1, ios::cur );

Again start the above loop from '[' character.

The seekg function not work sometimes. How can i solve the probelm?

Is there any tool available to find the special character or unknown character in text file?

Thanks & Regards,

-- modified at 2:19 Thursday 15th February, 2007

Vichu

Re: Seekg problem in text file?

kakan14-Feb-07 23:48

kakan

14-Feb-07 23:48

Just a thought: I think (but haven't verified it), that a file has to be opened in binary mode for seek:s (and tell) to work properly.
Maybe that's your problem?

Alcohol. The cause of, and the solution to, all of life's problems - Homer Simpson

Re: Seekg problem in text file?

Vishvanathan15-Feb-07 0:09

Vishvanathan

15-Feb-07 0:09

Hi Kakan,

I am using text mode only.The text file contains upto 50 lines.During the process, the seekg function is not working at some times only.Most of the time, the file pointer seek to previous position successfully. I don't known the exact reason for this seek function behavior.

Is any other way to correct this problem?

Vichu

Re: Seekg problem in text file?

kakan15-Feb-07 0:17

kakan

15-Feb-07 0:17

Yes, what I already said: use binary mode for the file handling. Or rather: try, I still haven't checked that I'm correct (but I'm pretty sure I'm right).

The only thing you will have to put up with, using binary mode, is that you will get CR/LF-sequences as they exists in the file. That is, no conversion to a single \n.
An easy way to overcome this "problem" is to simply ignore all CR characters read from the file.

Alcohol. The cause of, and the solution to, all of life's problems - Homer Simpson

Re: Seekg problem in text file?

Vishvanathan15-Feb-07 0:34

Vishvanathan

15-Feb-07 0:34

I will try the binary mode operation and then update you.

Thanks kakan.

Vichu

Re: Seekg problem in text file?

Vishvanathan21-Feb-07 23:35

Vishvanathan

21-Feb-07 23:35

Hi kakan,

I fixed that seekg problem. Just I read the text file in binary mode rather than text mode.

Thank you for your response.

Regards,

Vichu

Re: Seekg problem in text file?

krmed15-Feb-07 0:41

krmed

15-Feb-07 0:41

If your file is really formatted as you have shown, you might want to use GetPrivateProfileString and SetPrivateProfileString instead. They are intended to handle files with the format you show

[SECTION]
Key=Value
Key2=Value2

Hope that helps.

Karl - WK5M
PP-ASEL-IA (N43CS)
PGP Key: 0xDB02E193
PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193

Re: Seekg problem in text file?

Vishvanathan21-Feb-07 23:38

Vishvanathan

21-Feb-07 23:38

Hi krmed,

You are exactly correct. But in my application, I am using fstream class and its member function to read/write the text file. The seekg function works well in binary mode.

Thank you for your information.

Vichu

File manage problem.

david bagaturia14-Feb-07 19:31

david bagaturia

14-Feb-07 19:31

Hi all.

I have some problem, I need class thet manage files as CFile in MFC, but in console.

can anyone help me.

Thanks for any help.

Re: File manage problem.

Don Box14-Feb-07 19:35

Don Box

14-Feb-07 19:35

MFC can be used in Console application also. So use MFC, and then u can use its CFile also.

Come online at:-
jubinc@skype

Re: File manage problem.

Nibu babu thomas14-Feb-07 20:05

Nibu babu thomas

14-Feb-07 20:05

david bagaturia wrote:
I have some problem, I need class thet manage files as CFile in MFC, but in console.

Look up AfxWinInit in MSDN. There is a sample along with it.

Also when you create a console project you have an option where you can specify whether you want MFC support for your application or not.

Nibu thomas
A Developer

Programming tips[^] My site[^]

Re: File manage problem.

Michael Dunn14-Feb-07 20:17

Michael Dunn

14-Feb-07 20:17

You can use CFile in a console app. The AppWizard for console apps has a checkbox for adding MFC support.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Ford, what's this fish doing in my ear?

Re: File manage problem.

david bagaturia14-Feb-07 20:31

david bagaturia

14-Feb-07 20:31

Tanks all.

It will useful for me, it solve a proble in my other project sow it help me lot, but in this time I am writing service and I need console, I can't use MFC.

Re: File manage problem.

Nibu babu thomas14-Feb-07 21:21

Nibu babu thomas

14-Feb-07 21:21

david bagaturia wrote:
but in this time I am writing service and I need console, I can't use MFC.

What about fstream?

Nibu thomas
A Developer

Programming tips[^] My site[^]

Re: File manage problem.

david bagaturia14-Feb-07 21:51

david bagaturia

14-Feb-07 21:51

Thanks all.

I have solve problem!!

Cool | :cool:

Appending & inseting Text in RichEdit

Swapnil G14-Feb-07 18:52

Swapnil G

14-Feb-07 18:52

Hi,

I am working on RichEdit Control,I am using it in Wizard Dialog.
I want to append & insert Unicode Text at specific position in RichEdit in the format such as (BOLD,ITALIC,ARIAL etc.).
if anyone has idea please tell me.
Smile | :)

Thanks,
Swapnil.

Re: Appending & inseting Text in RichEdit

Hamid_RT14-Feb-07 20:57

Hamid_RT

14-Feb-07 20:57

I think you aksed this question on previous messages I suppose you couldn't find answer,If I remember true I think I saw a discuss on the www.codeguru.com(Visual c++ section) about RichEdit(format text,...) see it yesterday

WhiteSky

Re: Appending & inseting Text in RichEdit

Mark Salsbery15-Feb-07 7:04

Mark Salsbery

15-Feb-07 7:04

I'm pretty sure I answered yesterday. Since you didn't believe that answer (apparently) then
maybe you haven't read anything about Rich Edit Controls[^]...

Great job, team. Head back to base for debriefing and cocktails.

Reference class from global

Oliver12314-Feb-07 18:18

Oliver123

14-Feb-07 18:18

I have a fragment of code as an example, and I'm trying to figure out what it does and how.

void WINAPI CLeft::Abc(LinkPtr pData)<br />
{<br />
   g_Spec().Xyz(pData);<br />
}

I know CLeft::CLeft is a global outside of any class. It receives callbacks from a server.
I know Xyz is in a class.
I know the pointer pData is being passed.
I think both Abc and Xyz are defined in the same file.
I'm not sure what g_Spec().Xyz()really is.

I'm trying to figure out how and where one defines g_Spec().Xyz(pData)so it can
1)be referenced by Xyz
2)be a class or within a class

Anything look familiar? I really don't know if there is enough here to provide sufficient information.

I am currently using the following and don't like it. It seems too complex, but that's how I got it to work.
Abc is outside any class.
Xyz is a function in CNewDlg.

void WINAPI Abc(LinkPtr pData)<br />
{<br />
((CNewDlg*)AfxGetApp()->m_pMainWnd)->Xyz(pData);

<---I don't like this
}

Thanks

Re: Reference class from global

jhwurmbach14-Feb-07 21:59

jhwurmbach

14-Feb-07 21:59

Oliver123 wrote:
I'm not sure what g_Spec().Xyz()really is.

From its name it semms to be a global, and from its use I think it could be a global function, returning the reference to a singelton-instance of a class providing a function called Xyz, which takes a parameter that very well could be a LinkPtr.

Oliver123 wrote:
void WINAPI Abc(LinkPtr pData)
{
((CNewDlg*)AfxGetApp()->m_pMainWnd)->Xyz(pData); <---I don't like this
}

Have you considered sending a user defined message?

Failure is not an option - it's built right in.

c programming

deeps_cute14-Feb-07 17:05

deeps_cute

14-Feb-07 17:05

i have to list all the hardware devices in the system by c language. is there any function to display all the devices. anyone know this. please help me

Arise Awake Stop Not Till ur Goal is Reached.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.