Re: Regarding segmentation fault while creating boxes

[Roland Bock <box2OO6 eudoxos de>]

Hi Nisha,

I am not sure if I understand your intention correctly.

If you want to modify the size on the screen, you need to consult the 
gtk documentation. There are functions like gtk_widget_set_size_request.

If you want to change the scales within the gtkdatabox, you could use
gtk_databox_set_total_limits.


Regards,

Roland



nisha jain wrote:
> Hi Ronald,
>  
> Thanks alot for information and you were absolutely correct it was 
> problem with poiters only. I was not able to catch as there were two 
> segmentation faults which were comming in different sequence. I resolved 
> the problem using gdb debugger.
>  
> I have now left with only one problem. I am reading and trying to find 
> out how to decrease size of data box which i am not able to identify... 
> I am looking at the gtkdatabox.c file and trying to identify the API to 
> use to decrease the size of data boxes horizontally. I have this very 
> basic requirement i don't have to do it again and again only once while 
> creating but there are nothing like coordinates for box to specify.
>
> Please let me know if you can provide some valuable information.
>  
> Thanks and Regards,
> Nisha
>  
> On 4/6/08, *Roland Bock* <box2OO6 eudoxos de 
> <mailto:box2OO6 eudoxos de>> wrote:
>
>     Hi Nisha,
>
>     without the code, this is hard to tell. I would still guess that you
>     have some error in your pointer arithmetic.
>
>     Since you report "random" errors, the problem might also be in a
>     completely different area of the code. Writing data outside array
>     boundaries might cause such effects.
>
>     There is a nice open source tool called "valgrind" which we are using
>     rather successfully in such situations in my current company. Calling
>
>     valgrind <your program>
>
>     you will get a lot of information about memory usage and lots of
>     potential problems like uninitialized data, array boundaries etc.
>
>     Valgrind also works well with multi-threaded applications.
>
>
>     I have not used it on any gtk application yet, because I have learnt
>     about that tool only recently. Using valgrind on gtkdatabox is one of
>     the big issues on my list of TODOs before releasing the next version.
>
>
>     If valgrind does not lead you to the solution of your problems, I
>     suggest you send the *complete code* of an very minimal example that
>     reproduces the problem. Sniplets or error messages from the system or
>     the debugger are much tougher to analyse (at least for me).
>
>     Regards,
>
>     Roland
>
>     PS: This also applies for the graph color problem and the resize issue
>     (valgrind and/or code for the former, code for the latter).
>
>
>
>     nisha jain wrote:
>      > Hi All,
>      >
>      > I am trying to get multiple boxs using gtkdatabox APIs and then i am
>      > attaching with it multiple
>      > graphs doing so i am getting unexpected segmentation faults also
>     these
>      > are random in nature.
>      >
>      > I tried checking all my pointer logic and started making from scratch
>      > again but i again received
>      >
>      > the segmentation fault. I finally checked it using gdb debugger after
>      > taking core dump and tried
>      >
>      > to backtrace my code i am attaching the result as follows --
>      >
>      >
>      > [sbox-CHINOOK_X86: ~/Local_WorkSpace_Nisha/N800_DIR] > gdb
>     N800App core
>      > GNU gdb 6.4.90
>      > Copyright (C) 2006 Free Software Foundation, Inc.
>      > GDB is free software, covered by the GNU General Public License,
>     and you are
>      > welcome to change it and/or distribute copies of it under certain
>      > conditions.
>      > Type "show copying" to see the conditions.
>      > There is absolutely no warranty for GDB.  Type "show warranty"
>     for details.
>      > This GDB was configured as "i686-pc-linux-gnu"...Using host
>     libthread_db
>      > library "/scratchbox/host_shared/lib/libthread_db.so.1".
>      >
>      > *Core was generated by `./N800App'.
>      > Program terminated with signal 11, Segmentation fault.
>      > #0  0x08049cb0 in signal_idle_func (box=0x806e800) at N800App.c:380
>      > 380        if (!GTK_IS_DATABOX (box))
>      > (gdb)
>      > *
>      >
>      >
>      > Please let me know if some one can provide any idea why this is
>     happening?
>      >
>      > Regards,
>      > Nisha
>      >
>      >
>      >
>      >
>      >
>      >
>      >
>     ------------------------------------------------------------------------
>      >
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