[gtk-server] Re: Formatting floats (Was: gtk-server Digest V5 #3)
- From: Peter van Eerten <administrator@xxxxxxxxxxxxxx>
- To: gtk-server@xxxxxxxxxxxxx
- Date: Fri, 05 Sep 2008 22:03:59 +0200
Hi Erik,
Looking further into this matter, I realized that 'gtk_server_opaque'
always allocates a fixed amount of memory which is of GtkWidget size.
On a 32bit system, this is limited to 60 bytes. But what if you need a
larger memory buffer? Things would segfault very fast.
Therefore, it is better to use g_malloc to allocate memory, and use
g_snprintf to limit the output.
So, IMHO the best way to go would be this, assuming 20 bytes of
allocated memory:
peter[~]$ gtk-server -stdin
gtk_server_define g_snprintf NONE NONE 4 WIDGET INT STRING DOUBLE
ok
gtk_server_define g_malloc NONE WIDGET 1 INT
ok
g_malloc 20 <----------------------------------- reserve 20 bytes
135155200
g_snprintf 135155200 20 "%.2f" 1.23456 <-------- limit sprintf to 20
bytes also
ok
g_object_set renderer "text" 135155200 NULL
ok
g_free 135155200 <------------------------------ free the 20 bytes
ok
That should do the trick in a memory safe manner.
Greetings
Peter
Quoting Peter van Eerten <administrator@xxxxxxxxxxxxxx>:
Reading the GLib docs:
http://library.gnome.org/devel/glib/stable/glib-String-Utility-Functions.html#g-snprintf
The 'g_snprintf' function and friends are very similar to the default
libc functions, so why not give it a shot with GLIB? This is more
portable also. Then it would look like:
gtk_server_define g_sprintf NONE NONE 3 WIDGET STRING DOUBLE
or
gtk_server_define g_snprintf NONE NONE 4 WIDGET INT STRING DOUBLE
On my Linux system:
peter@host:~$ gtk-server -stdin
gtk_server_define g_sprintf NONE NONE 3 WIDGET STRING DOUBLE
ok
gtk_server_opaque
7301168
g_sprintf 7301168 "%.2f" 1.234
ok
gtk_server_define g_printf NONE NONE 2 STRING WIDGET
ok
g_printf "%s\n" 7301168
1.23
ok
Please let me know if it works!
Regards
Peter
Quoting Erik Winkels <euqirea@xxxxxxxxx>:
Date: Fri, 05 Sep 2008 16:41:49 +0200
From: Peter van Eerten <administrator@xxxxxxxxxxxxxx>
Subject: [gtk-server] Re: List Activity
I have the same issue on my 64bit system. Can you please send me
the output of the following:
echo "gtk_server_ffi" | gtk-server -stdin
FFI
echo "gtk_server_version" | gtk-server -stdin
2.2 build 7
uname -a
Windows XP Professional SP2 ;-)
I'm also using CLISP 2.45.
While I'm a Unix man by heart I'm actually targetting the
application I'm writing at Windows (it will be a utility for a game
I'm playing[1]) since the target audience is mainly using that
platform.
I should have been more clear about that, sorry :-( Would it still
be worth it to try the sprintf / printf solution you posted on
the Windows platform?
Erik
--
http://www.gtk-server.org
--
http://www.gtk-server.org
Other related posts:
