iLiad ANNOUNCE: Lua5.1 package for Iliad

[Iñigo]

Originally Posted by hansel

Hi,

I just upgraded the package for Lgob: the Lua binding for GTK+, Glib, GDK and Pango. This version has (probably) less bugs and more features Thanks again to Lucas Hermann Negri for this great Lua binding!

The new version can be downloaded here: https://dev.mobileread.com/dist/hans...liad-0.1.9.ipk. This version is based on the sources at http://downloads.tuxfamily.org/oproj...9.11.1.tar.bz2

Hello,

As fast test, I've noted a crash with this new lgob-iliad release:

root@ereader:/media/card/Programs/Toolbox$ lua _files/Toolbox.lua  | ./_files/xx  -p
   0.001: ./_files/xx: started (debug=0, forward=1)
lua: _files/modules/sysinfo.lua:265: The GObject doesn't have the property sort_column_id!
stack traceback:
	[C]: in function 'set_sort_column_id'
	_files/modules/sysinfo.lua:265: in function 'ui_init'
	_files/modules/sysinfo.lua:357: in main chunk
	[C]: in function 'dofile'
	_files/Toolbox.lua:60: in function <_files/Toolbox.lua:60>
	[C]: in function 'main'
	_files/Toolbox.lua:87: in main chunk
	[C]: ?
  53.046: ./_files/xx: Done

The mentioned line shows:

col:set_sort_column_id(i-1)

while "col" is defined as:

local col = gtk.TreeViewColumn.new_with_attributes(coldef[1], coldef[2], "text", i-1)

It worked in v0.1.8.

EDIT: just discovered that examples/Navigator.lua also has this problem, so the regression comes from lgob-0.11.1.

Thanks,
Iñigo

[hansel]

Originally Posted by Iñigo

Hello,

As fast test, I've noted a crash with this new lgob-iliad release:

Thanks for the report an the details. I mailed Lucas, and wil post a new release when the bug is solved. Please revert to the previous ipk until then...
For this you may need to uninstall the new version first (with the command ipkg remove lua5.1-iliad lgob-iliad): just installing the old version with ipkg will not work because of the lower version number)

[ericshliao]

I want to write a lua script which calls a command and redirect the output of that command back to lua script. In C, I use FILE *p = popen(). I wonder if I can do the same thing easily in lua script. Thanx for help.

[hansel]

Originally Posted by ericshliao

In C, I use FILE *p = popen(). I wonder...

It's called io.popen()

  local f = io.popen("ls -l")        -- runs command
  local buf = f:read("*a")          -- read output of command
  f:close()
  print(buf)

[ericshliao]

Originally Posted by hansel

It's called io.popen()

  local f = io.popen("ls -l")        -- runs command
  local buf = f:read("*a")          -- read output of command
  f:close()
  print(buf)

Thanx. I find io.popen() now. I looked for them in the wrong section.

added:
another question:
how do I get the size of buf?

added 2:
I am trying using the length operator #.

[ericshliao]

It's quite strange. I can't call gdk_pixbuf_loader_write using the form:

local gpldr = gdk.PixbufLoader.new()	
local success = gdk.PixbufLoader.write(gpldr, file_buf, ret, nil)

or

local gpldr = gdk.PixbufLoader.new()	
local success = gpldr:write(file_buf, ret, nil)

So I checked with Navigator.lua and pixbuf.def and found it strange (as the attached image). In pixbuf.def, there is an entry for gdk_pixbuf_loader_write(), but not listed on Navigator.lua.

[hansel]

Originally Posted by ericshliao

So I checked with Navigator.lua and pixbuf.def and found it strange (as the attached image). In pixbuf.def, there is an entry for gdk_pixbuf_loader_write(), but not listed on Navigator.lua.

When building lgob, the log file (./lgob-9.09/gdk/log) shows that gdk_pixbuf_loader_write() is not handled (no code is generated)

This is (probably) because of the second parameter

defFunction('gdk_pixbuf_loader_write',
        {
                class = 'GdkPixbufLoader',
                since = '0.1',
                args = {'GObject* none', 'unhandled none', 'gsize none', 'GError** full'},
                ret = 'boolean none'
        }
)

This is (probably) caused by the fact that lgob's code generator does not understand the corresponding type (yet)

gboolean  gdk_pixbuf_loader_write  (
  GdkPixbufLoader *loader,
  const guchar *buf,
  gsize count,
  GError **error);

I'll check this with Lgob's author...

Edit: I just got a replay form Lucas: The analyse was correct, it will be fixed soon in a Lgob update. Il update the Iliad package after that...

[hansel]

Originally Posted by ericshliao

another question:
how do I get the size of buf?
I am trying using the length operator #.

The # operator or string.len() probably both do what you want. Beware that these do not stop on '\0'...

> a='xxx\0yyy'
> print(a)
xxx
> print(#a)
7
> print(string.len(a))
7

[hansel]

I've just build a new version of lgob-iliad: lgob-iliad-0.1.11.ipk. It can be downloaded at: https://dev.mobileread.com/dist/hans...iad-0.1.11.ipk

It (should) solve the issues with gtk.TreeViewColumn.set_sort_column_id() [see message 106] and gdk.PixbufLoader.write() [see message 111]

This build is based on lgob-9.11.2

As always: feedback is welcome...

[ericshliao]

I just tried lgob9.11.2 on Debian5. When I execute a example, I got the following error message:

iliaddev@Vigor8:/tmp/lgob-9.11.2/examples$ lua Viewport.lua
lua: [string "glib.handle_log('Gtk')"]:1: attempt to call field 'handle_log' (a nil value)
stack traceback:
[string "glib.handle_log('Gtk')"]:1: in main chunk
[C]: ?
[C]: in function 'require'
Viewport.lua:3: in main chunk
[C]: ?

[hansel]

Originally Posted by ericshliao

I just tried lgob9.11.2 on Debian5. When I execute a example, I got the following error message:

It works for me: Ubuntu, GOBJECT=2.20.1, GDK=2.16.1, PANGO=1.24.1, GTK=2.16.1

You didn't forget make install, did you?

[ericshliao]

Originally Posted by hansel

You didn't forget make install, did you?

I think that I did do a make install for each directory in lgob. In case I missed one, I repeated "make install" again. The error still exists.

[hansel]

Originally Posted by ericshliao

I think that I did do a make install for each directory in lgob. In case I missed one, I repeated "make install" again. The error still exists.

I looked at Lgob again, but I see no reason for a missing handle_log()?!?! It was changed since lgob-9.09, but there are no specific version dependencies for this function...

• It is implemented in gobject: can you see it in lgob-9.11.2/gobject/src/iface.c?
• Maybe you have some older gobject.so somewhere in your Lua path (the default install goes to /usr/local/lib/lua/5.1/lgob/gobject.so)
• Otherwise, you might have have to 'use the force'

[ericshliao]

Thanx.
The problem is solved.
I found old lgob libs in /usr/lib. After removing them, and doing "make install" again, the problem disappeared.

[ericshliao]

lgob-iliad0.1.11 is working on my iLiad. I put a experiement djvu viewer here: https://www.mobileread.com/forums/sho...67&postcount=2