On 2010-12-21 09:25+0100 Arjen Markus wrote:
> I solved it, based on a suggestion from a fellow Tcler: we need to
> pass the string to a Tcl_UtfToExternal*() function. The problem on
> Windows is that the system encoding is _not_ UTF-8, but cp1252.
> The strings in the source are therefore translated from cp1252 to UTF-8,
> so that the resulting string represents these characters. Using said
> function undoes this translation: the PLplot routines receive the
> original sequence of bytes.
I think this explanation must be incomplete or incorrect. The reason I
say this is our Tcl example files, e.g., x24.tcl, (and our C code as
well, for that matter) are all encoded directly in UTF-8. So when I
use the emacs editor to look at x24.tcl, the "Peace" words below
set peace {
are displayed correctly for every language. Apparently it would be
impossible to encode those peace words as cp1252. That encoding is
quite limited and very close to ISO-8559-1 according to the Wikipedia
article about it, and thus would not be able to represent, e.g., the
Mandarin, Arabic, etc. words for Peace that I see when editing that
file with emacs.
On Linux, when the pltcl executable interprets those UTF-8 encoded source
files, it does everything as expected and passes those strings directly
as UTF-8 to the PLplot core library. (I have just double-checked
that by running "../../utils/pltcl x24 -dev pngcairo -o test.png" in the
build-tree
examples/tcl subdirectory on Linux, and the result was a perfect
Peace flag just like we get on Linux with the
x24c executable that is written
in C (as can be seen by looking at, e.g.,
http://plplot.sourceforge.net/examples-data/demo24/x24.01.png).
Arjen, what happens for the x24c executable on Windows for a modern
device such as pngcairo? (My wine fonts are quite limited so I just
get blanks for the exotic languages so it is not a definitive test).
If your x24c results with pngcairo are similar to the above result
displayed on our web site, then all is well in Windows C, and the only
remaining question is what is going on in Tcl for Windows that is so
different from C for Windows in how it deals with source files that
are encoded in UTF-8.
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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Linux-powered Science
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