Re: Bug in MagickAnnoteImage() if locale is set to de_DE.UTF-8

On Sun, 28 May 2017, Marvin Gülker wrote:

> Hi,
>
> I think I have found a bug in GraphicsMagick's Wand C API. The problem
> is that the MagickAnnotateImage() function always positions the text it
> is given at (0|0) no matter which actual values you pass for the X and Y
> co-ordinates. This however only happens if the programme's locale is set
> to de_DE.UTF-8; if the programme runs under en_US.UTF-8 everything works
> as expected.

There is a known problem in that parsing floating point numbers (e.g. 
numbers like "200.0") may fail if the locale uses different delimiter 
for the decimal point (e.g. "200,0").  The reason for this is that all 
text formats which include floating point numbers use traditional 
C/POSIX locale.  Changing the numeric locale to something else causes 
the operating system's floating point parsing and generation to 
operate incorrectly.

Is it possible that this is the problem causing the problem for you?

Try adding

   (void) setlocale(LC_NUMERIC,"C");

after any preceding locale requests.

GraphicsMagick does:

   (void) setlocale(LC_ALL,"");
   (void) setlocale(LC_NUMERIC,"C");

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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