#2 Pmw.Blt & Python 2.0/2.1 doesn't work?

[Anonymous]

I've used Pmw.Blt with Python 1.5.2 with no problems,
but I can't get it to work with Python 2.0 or 2.1. With
2.1, I can get Pmw to work fine, but not Pmw.Blt. Is
there a known problem with this? Here is the session
output

Python 2.1b1 (#1, Mar 8 2001, 20:37:37)
[GCC egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)]
on linux2
Type "copyright", "credits" or "license" for more
information.
>>> from Tkinter import *
>>> root=Tk()
>>> import Pmw
>>> Pmw.Blt.haveblt(root)
0
>>> root.tk.call('package', 'require', 'BLT')
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TclError: couldn't load file "/usr/lib/libBLT.so.2.4":
/usr/lib/libBLT.so.2.4: undefined symbol:
Tk_CanvasTagsParseProc
>

The same dialogue on python1.5 has no problems

Python 1.5.2 (#1, Feb 1 2000, 16:32:16) [GCC
egcs-2.91.66 19990314/Linux (egcs- on linux-i386
Copyright 1991-1995 Stichting Mathematisch Centrum,
Amsterdam
>>> from Tkinter import *
>>> root=Tk()
>>> import Pmw
>>> Pmw.Blt.haveblt(root)
1
>>> root.tk.call('package', 'require', 'BLT')
'2.4'

I'm running Redhat 6.2, and the 1.5.2 python is 'out of
the box', while the 2.1 is compiled from source - could
this cause problems?

thanks
David

[Greg McFarlane]

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Is it possible that either libBLT.so.2.4 does not exist
or that it is a different version than the one you
compiled python against? I suspect a versioning problem
because of the error message:
undefined symbol: Tk_CanvasTagsParseProc

[Nobody/Anonymous]

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Same problem, on Linux Mandrake 8.2

Python 2.2
Pmw 1.1 just installed
BLT 2.4.y just compiled

When gregm talk about "a different version than the one you
compiled python again"... Is BLT support built at tkinter
compile time ?

Thanks.

Laurent.

[Greg McFarlane]

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user_id=71522

Blt is part of Tcl/Tk. You can check if python has access to
Blt by running
the following commands. One of the last two lines should
return without
an error (although both may not).

import Tkinter
root = Tkinter.Tk()
root.tk.call('package', 'require', 'BLT')
root.tk.call('load', '', 'Blt')

If neither of the last two lines work, then you have a
problem with your
Blt installation, or your python or tcl interpreter can not
find Blt. You need
to fix this problem before Pmw.Blt will work.

[Nobody/Anonymous]

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Same problem with python 2.2 and Blt 2.4.
I think this is not a versionning problem since it work with
wish.

O.R.

[Greg McFarlane]

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user_id=71522

A combination that I know does work (compiled from the
source and linked statically) is:
python 2.2.1
tcl 8.3.2
blt 2.4u

[Nobody/Anonymous]

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This pages shows how to get BLT 2.4z working with python2.2

http://bebop.bigasterisk.com/scribblings/blt

(simple BLD makefile edit)

#

However, I needed a more permanent solution. I went to
blt2.4z/src/shared and rebuilt libBLT24.so with
-L/usr/local/lib -ltk8.4 -ltcl8.4. By this, I mean that I
found the gcc command that was used to produce libBLT24.so
and added those bits to the end. I installed the new
libBLT24.so into /usr/local/lib and the demo then worked
without any LD_PRELOAD.
#

An even better solution would be to fix the Makefile. This
can be done by appending the appropriate string to the line
in the Makefile for SHLIB_LD_FLAGS. The appropriate string
will vary for you, depending on your versions of Tcl and Tk
as well as the paths to libtclX.Y.so and libtkX.Y.so.
#

A yet better solution would be to get this fixed in BLT
itself. I will tell the developers about this when I have
the time.