[Cartoweb-users] Confused about .po files

Oliver Christen oliver.christen at camptocamp.com
Wed Oct 22 02:46:24 EDT 2008


the tests scripts where not designed to work on windows, as gettext has 
always worked fine out of the box so far with windows.
so it is perfectly normal the scipts give you errors.

does the translation work on the demoCW3 project ?

be sure the language you want to use in your project is installed in windows 
(Control Panel > Regional & Language Options > Languages > Installed 


> I'm still struggling with this. The manual says I can test whether gettext 
> is working by running scripts/testgettext.sh and scripts/testgettext.php. 
> Both of those fail, so perhaps I do not have a working gettext. However, I 
> note that the source code for those files says they only work under Linux; 
> should I expect those test programs to work in Cygwin on WinXP?
> The first test fails with these messages:
> /cygdrive/c/.../Temp/cc6XJfWK.o:sample.c:(.text+0x88): undefined reference 
> to `_libintl_bindtextdomain'
> /cygdrive/c/.../Temp/cc6XJfWK.o:sample.c:(.text+0x94): undefined reference 
> to `_libintl_textdomain'
> /cygdrive/c/.../Temp/cc6XJfWK.o:sample.c:(.text+0x9f): undefined reference 
> to `_libintl_gettext'
> collect2: ld returned 1 exit status
> scripts/testgettext.sh: line 68: /tmp/sample: No such file or directory
> The PHP test fails with this message:
> error: create /tmp/fr/LC_MESSAGES folder failed !
> Does this mean that gettext is not working on my system, or are these 
> errors because the tests only work under Linux?
> I get no error messages when I run cw3setup.php -- the last thing it says 
> is:
> Launching po2mo script for projects: ACORN
> Installation finished...
> How can I tell if my problem is a broken gettext system vs. mistake(s) I'm 
> making in configuring the .po files?
> FYI: At first, I was getting additional PHP errors indicating that 
> php_gettext was not installed; I un-commented the reference to that 
> extension in php.ini and copied php_gettext.dll to my php/ext folder, and 
> those messages disappeared.
> Chris
> Oliver Christen wrote:
>> well, by "translation", understand "string replacement"
>> practicaly, you "translate" raw strings into something more pleasant to 
>> read for human.
>> so the translation system is useful even if you use only one language.
>> you can certainly override the template in your project and simply 
>> directly replace the string inside but this will not work for the other 
>> string recovered from php, ini and mapfile
>> regards
>> Oliver
>>> Hi Oliver,
>>> Thanks so much for your patient and clarifying response. Using what you 
>>> wrote and going through the Cartoweb documentation and the web again, I 
>>> now realize something which was not obvious to me before: that the whole 
>>> text translation scheme is a widely-used method, not limited just to 
>>> Cartoweb... Since I have never developed with these tools or with 
>>> internationalization before, I did not know about Gnu gettext and the 
>>> po/mo files; I thought it was something special to Cartoweb. Now I can 
>>> read the gettext documentation to understand much more.
>>> One thing is still not quite clear to me: do I need to worry about 
>>> gettext, po/mo files, and all of that if I just want to change some 
>>> pieces of text *without translation* (the example I used last night is 
>>> changing the zoomin tool hover text from "Zoom In" to "Choose this tool 
>>> and click on the map to zoom in")?  I think the answer is "yes" -- even 
>>> though I am not trying to internationalize or translate or localize the 
>>> text, I think I must create po files and add my new text as the 
>>> "translation" for the "zoomin" msgid. Is that correct?
>>> One reason I am still confused on this point is that every reference to 
>>> text and messages in the Cartoweb documentation talks about 
>>> *translation*. There are lots of places that say, more or less, "If you 
>>> need to translate this, you will need gettext... etc". I am not 
>>> translating anything, so at first I thought none of those discussions 
>>> applied to my situation, but now I think that changing the default text 
>>> is basically the same process as translating. Is this correct?
>>> I will continue my reading and then try to make sense of your examples 
>>> and suggestions. Thanks again for starting to point me in the right 
>>> direction. And thanks to you and Bruno for pointing out that gettext is 
>>> apparently needed but not working or not available on my live web 
>>> server... I will look into that problem after I get my development 
>>> system correctly changing the text I'm working on.
>>> Cheers,
>>> Chris
>>> Oliver Christen wrote:
>>>> hi
>>>> po are only human readable container for the text<->translation strings
>>>> when running the cw3setup script, the .po get compilated by gettext 
>>>> into binary .mo, these files are located in 
>>>> cartoweb3/locale/*langcode*/LC_MESSAGES/*projectid.projectid.projectid*.mo
>>>> these are the files actualy used by gettext to do the string 
>>>> replacement in real time.
>>>> the .po contains the string you want to translate.
>>>> For convenience, cartoweb include 2 scripts one can use to generate 
>>>> some basic .mo for a given project: client2pot and server2pot.
>>>> These script simply look inside all the files of your project for every 
>>>> strings included into I18n::gt(...) call (in php file) or into 
>>>> {t}...{/t} tag (in templates files). additionaly, the server2pot also 
>>>> get all the layer's labels from either the layers.ini file or the 
>>>> mapfile.
>>>> dynamicaly generated strings will not get "recovered" by those scripts 
>>>> unless someone provided some fake/hidden {t}..{/t} or I18n::gt(...), 
>>>> for example for the tools's labels.
>>>> client.po, server.*projectid*.po, server.po contain the raw 
>>>> (untranslated) list of strings for a given project.
>>>> msgid "IdRecentering"
>>>> msgstr ""
>>>> client.en.po, server.*projectid*.en.po, server.en.po are COPIES!!! of 
>>>> the raw .po but this time they ALSO contain the translated strings for 
>>>> the corresponding language.
>>>> msgid "IdRecentering"
>>>> msgstr "Identifiers recentering"
>>>> to quickly add translations to your projects, you can easily copy the 
>>>> existing .po files provided in cartoweb by default and modify them. You 
>>>> will have some extra translated/unwanted strings but nothing that cant 
>>>> be easily modified/removed if needed.
>>>> copy ALL the .po files into your project's po folder.
>>>> look at an existing demo /po folder to see whats there.
>>>> if you want "clean" po files, you need to run the client2pot and 
>>>> server2pot scripts to generate the RAW po files for your project and 
>>>> then COPY these files and rename them with the extra 2 letters lang tag 
>>>> (.po > .en.po) and EDIT them to add the translations for all the 
>>>> strings you want.
>>>> I would suggest moving/deleting all .po existing in cartoweb3/po/ 
>>>> BEFORE doing that, as if some .po already exist, the script will try to 
>>>> merge their content with the newly extracted content, which may be 
>>>> problematic.
>>>> so once you have emptied the /po folder, go to /cartoweb3/scripts/ and 
>>>> run the command "php client2pot.php *yourprojectid*" and "php 
>>>> server2pot.php *yourprojectid*"
>>>> if you see  ("zoomin", "query_by_bbox") it means the strings are NOT 
>>>> translated.
>>>> check that gettext is installed and that it works correctly (see 
>>>> documentation on how to test that 
>>>> http://www.cartoweb.org/doc/cw3.5/xhtml/user.i18n.html#user.i18n.translations.debug) 
>>>> restart Apache too.
>>>> gettext is a bit buggy and sometimes you need to restart Apache to see 
>>>> the modification you did in the .po files even after you have run the 
>>>> cw3setup script to generate the .mo
>>>> regards
>>>> Oliver
>>>> ----- Original Message ----- From: "Chris Duncan, GISmatters" 
>>>> <duncan at gismatters.com>
>>>> To: "Cartoweb Users" <cartoweb-users at lists.maptools.org>
>>>> Sent: Wednesday, October 15, 2008 11:30 PM
>>>> Subject: [Cartoweb-users] Confused about .po files
>>>>> I am *not* trying to internationalize my application -- for our user 
>>>>> base and local application, there's no need to support any other 
>>>>> language than English.
>>>>> I would like, however, to change some of the text that appears (for 
>>>>> example, in the tips that pop up when you hover over a tool like the 
>>>>> zoom-in tool).
>>>>> I have tried to understand the system of .po files (defaults, 
>>>>> project-specific, alternate languages, sources vs. generated, etc), 
>>>>> but have become completely confused. I have not found enough info in 
>>>>> the documentation or wiki to clear up my confusion.
>>>>> Could someone please provide a simple, clear, concise discussion of 
>>>>> the following (if you don't have lots of time to answer, then please 
>>>>> just skip to item (c) which is my most urgent question):
>>>>> (a) When, and in what order, do .po files get used? For one thing, I'm 
>>>>> confused about what happens when I refresh the installation using 
>>>>> cw3setup vs. what happens at runtime when someone is using the site. I 
>>>>> see that there are *generated* .po files in the htdocs/po folder... I 
>>>>> assume *those* are the ones that actually provide text to the 
>>>>> application at runtime. But even there I find "default" and 
>>>>> project-specific folders and files. Where do "source" files live, and 
>>>>> what is the chain of processing that converts and/or merges them to 
>>>>> create the ones I see in htdocs/po?
>>>>> (b) When do language-specific files get used? If there is both a 
>>>>> client.po and client.en.po file, which one gets used? What is the 
>>>>> interaction of the "generic" vs. the "language-specific" .po files?
>>>>> (c) Last, but most important to me at this time: Suppose I wanted to 
>>>>> change the hover-text of the "zoom in" button to say "Choose this tool 
>>>>> and click on the map to zoom in" (we have some very un-savvy users!). 
>>>>> What specific steps do I follow to make that change in the recommended 
>>>>> way? My project currently has *no* po folder or files... do I copy 
>>>>> them from <cartowebhome>/po and then modify them? Do I need to run 
>>>>> server2pot.php and client2pot.php to initialize them in some way? I'm 
>>>>> totally lost on how to proceed...
>>>>> One final detail that adds to my confusion: on my development machine 
>>>>> (WinXP, Apache server) I get message text like "Zoom in" or "Query by 
>>>>> rectangle" when I hover over the tools; when I upload my project to 
>>>>> the live web server (Windows Server, IIS) the tips are the message IDs 
>>>>> instead of the text ("zoomin", "query_by_bbox"). Why do they differ?
>>>>> Thanks in advance to any of you who can help me understand this! 
>>>>> Cheers,
>>>>> Chris
>>>>> -- 
>>>>> Chris Duncan, Ph.D.
>>>>> President
>>>>> GISmatters
>>>>> duncan at GISmatters.com
>>>>> http://www.gismatters.com/
>>>>> 1 Tuckerman Ln
>>>>> Amherst, MA 01002
>>>>> Tel: 413-549-2052
>>>>> Fax: 508-637-2557
>>>>> _______________________________________________
>>>>> Cartoweb-users mailing list
>>>>> Cartoweb-users at lists.maptools.org
>>>>> http://lists.maptools.org/mailman/listinfo/cartoweb-users
>>> -- 
>>> Chris Duncan, Ph.D.
>>> President
>>> GISmatters
>>> duncan at GISmatters.com
>>> http://www.gismatters.com/
>>> 1 Tuckerman Ln
>>> Amherst, MA 01002
>>> Tel: 413-549-2052
>>> Fax: 508-637-2557
> -- 
> Chris Duncan, Ph.D.
> President
> GISmatters
> duncan at GISmatters.com
> http://www.gismatters.com/
> 1 Tuckerman Ln
> Amherst, MA 01002
> Tel: 413-549-2052
> Fax: 508-637-2557
> _______________________________________________
> Cartoweb-users mailing list
> Cartoweb-users at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/cartoweb-users

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