Re: [Dev-C++] Segmentation Fault - Debugging

[Adam J. <aj...@i-...>]

>> You wrote:
>> 'gdb' reports that the error is in basic_string.h, line 261. I am
compiling 
>> using mingw32 v 3.4.4
>> In a WinXP machine.
>> What has me comfused is that I am not using the std library, but the Glib

>> library; yet the error comes from the std library

I haven't used Glib, but if you are getting that error, my suspicion is that
Glib my derived it's ustring from basic_string class template, and that is
why you are getting that reference to basic_string.h.

>> Glib::ustring* str;

As for why you are getting the error, again my suspicion from the code
fragment is that you make a declaration for the pointer (statement above),
but you don't have it pointing to anything before you test it (statement
below).

>> if (str->empty()){str = new Glib::ustring("Unknown");}

You need to assign it to something. What it is pointing to is undefined.
Pointers must point to something before you can use them. Unless you have
done that in code you have not shown us.

-Adam Jones

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of Jamiil
Abduqadir
Sent: Saturday, July 21, 2007 11:52 PM
To: Per Westermark
Cc: 'Dev Cpp MailingLinst'
Subject: Re: [Dev-C++] Segmentation Fault - Debugging

Per and Adam, thank you very much for the hand.
Using Per's suggetion I used the DOS prompt to run gdb and tb, and as 
requested by Adam, here is the slice of code that is causing all the 
problems.
hpp file
#include <glibmm/ustring.h>
....
Glib::ustring* str;
...
cpp file
if (str->empty()){str = new Glib::ustring("Unknown");}
...

'gdb' reports that the error is in basic_string.h, line 261. I am compiling 
using mingw32 v 3.4.4
In a WinXP machine.
What has me comfused is that I am not using the std library, but the Glib 
library; yet the error comes from the std library
Can anyone help?
----- Original Message ----- 
From: "Per Westermark" <pw...@ia...>
To: "Jamiil Abduqadir" <jal...@gm...>
Cc: "Adam Jones" <aj...@i-...>; "'Dev Cpp MailingLinst'" 
<dev...@li...>
Sent: Saturday, July 21, 2007 11:12 AM
Subject: Re: [Dev-C++] Segmentation Fault - Debugging


>I never use the built-in debugger support in Dev-C++, but if you can get
> the application to fail in the debugger - or by running directly from gdb
> om command line, the back trace command (bt in command line version) will
> dump the call sequence where the application died.
>
> /pwm
>
> On Sat, 21 Jul 2007, Jamiil Abduqadir wrote:
>
>> Well, I would like to give you more information, but my problem is that I
>> don't know how to utilize Dev-Cpp's debugger to locate the problem. If 
>> you
>> know a trick to catch the problemed code, please let me know.
>>
>> Thanks in advance.
>> ----- Original Message -----
>> From: "Adam Jones" <aj...@i-...>
>> To: "'Jamiil Abduqadir'" <jal...@gm...>; "'Dev Cpp MailingLinst'"
>> <dev...@li...>
>> Sent: Saturday, July 21, 2007 5:47 AM
>> Subject: RE: [Dev-C++] Segmentation Fault - Debugging
>>
>>
>> You Wrote:
>> > I have a segmentation fault in my program
>>
>> This usually indicates a pointer allocation problem. Check your pointers 
>> in
>> your program. Make sure they are allocated and initialized correctly 
>> before
>> using them. Without out knowing more about the code or what you are 
>> doing,
>> this is the only advice I can give at this point.
>>
>> -Adam Jones
>>
>>
>> From: dev...@li...
>> [mailto:dev...@li...] On Behalf Of Jamiil
>> Abduqadir
>> Sent: Saturday, July 21, 2007 10:37 AM
>> To: Dev Cpp MailingLinst
>> Subject: [Dev-C++] Segmentation Fault - Debugging
>>
>> Hello.
>> I have a segmentation fault in my program, I know that I could trace, or
>> back trace in this case, to find where the the segmentation fault 
>> occures.
>> What I don't know, though, how to do it.
>> Can someone please point me out where I can get this information, or tell
>> how to do it under Dev-Cpp?
>>
>> Thanks everyone.
>>
>>
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> 


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