Getting the current encoding
lazarus / 7-LCL

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tech-pro · 2008-11-05 09:48

I am trying to take advantage of the UTF8 support in the latest
Lazarus but for compatibility reasons I need to convert the entered
text into an 8-bit representation. Therefore I need to know the
encoding that is used so that I can call the appropriate UTF8Toxxxx
function in unit LConvEncoding.

The function GetSystemEncoding appears to return the default encoding
method for the system, which I presume is by design since there is no
description of the function in the documentation.

This falls down if you use the Language Bar in Windows (I don't know
if Linux has similar functionality.) If I switch to say a Russian
keyboard the function still reports the encoding on my system as
'cp1252'.

It seems to me that there needs to be a GetCurrentEncoding function,
or something like that, but perhaps I am missing something?

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Phil · 2008-11-05 14:18

Quote from: "tech-pro"The function GetSystemEncoding appears to return
the default encoding method for the system, which I presume is by
design since there is no description of the function in the
documentation.

On Windows, GetSystemEncoding uses the Win API function GetACP.

On non-Windows, GetSystemEncoding uses a variety of environment
variables, none of which will be set on OS X. Don't know about Linux.

Thanks.

-Phil

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tech-pro · 2008-11-05 17:43

On Windows, GetSystemEncoding reports 'cp1252'. On my Linux system it
reports 'ansi'. I'm not sure what I'm supposed to do with that. In the
keyboard section of the control panel the character set is selected as
ISO-8859-1'. That does not appear in any environment variable I can
see, so there appears to be no way for a program to find it out. I
guess it is yet another example of how Linux has not been properly
thought out. However, Linux users are pretty used to working around
stuff like this. I have added a setting to my program to allow the
character encoding to be specified. It's up to the user to make it
match what they are using.

I would have thought that under Windows there was a way for a program
to find out the character set being used if changed on the fly from
the taskbar, but I'm not up on API stuff to know how to do it.
Probably no-one is going to be changing the language on the fly other
than me, who was doing it just to see how the program would handle
non-English characters.

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Phil · 2008-11-05 18:30

Quote from: "tech-pro"On Windows, GetSystemEncoding reports 'cp1252'.
On my Linux system it reports 'ansi'. I'm not sure what I'm supposed
to do with that. In the keyboard section of the control panel the
character set is selected as ISO-8859-1'. That does not appear in any
environment variable I can see, so there appears to be no way for a
program to find it out. I guess it is yet another example of how Linux
has not been properly thought out. However, Linux users are pretty
used to working around stuff like this. I have added a setting to my
program to allow the character encoding to be specified. It's up to
the user to make it match what they are using.

I would have thought that under Windows there was a way for a program
to find out the character set being used if changed on the fly from
the taskbar, but I'm not up on API stuff to know how to do it.
Probably no-one is going to be changing the language on the fly other
than me, who was doing it just to see how the program would handle
non-English characters.

Here's a bug report that I filed that has some very useful feedback
from Laz/FPC authors:

http://bugs.freepascal.org/view.php?id=12198

Maybe you can for now adapt the approach that Jonas suggests.

Thanks.

-Phil