Thanks for the reply, now I get it, I can not use WApplication::instance() in
WResource,
but I do not fully understand how to create a WMessageResourceBundle in main:
"For this, you need Wt::WMessageResourceBundle instance.
In main(), create new WMessageResourceBundle,
call use() to add your translated XML files,
then pass it to WServer::setLocalizedStrings()."
Can you give me an example of this please?
I get stuck at
int main(int argc, char **argv) {
Wt::WMessageResourceBundle myMessageResourceBundle;
myMessageResourceBundle().use("./app_root/ww-home", false); // error: no
match for call to...
and
Wt::WServer::setLocalizedStrings();
takes a WLocalizedStrings as a parameter
Thanks
On Wed, 2014-06-25 at 12:12 +0400, Nagaev Boris wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
>
> Hello!
>
> Use WApplication::instance() to get a pointer to current WApplication. No
> need to construct application object in handleRequest(). The only place where
> application is created is application creating function (ApplicationCreator),
> which is passed to WRun() or to WServer::addEntryPoint(). So, only Wt
> internals should create new instances of application, not your code!
>
> WApplication::instance() can be used from event handling functions (e.g.,
> slots connected to Wt signals) and handleRequest() if WResource is bind to an
> application. You can use assert(wApp) to make sure it is not 0. It can be 0
> no application instance is active currently (for example, in server-global
> WResource or in main() function).
>
> Macro wApp is equal to WApplication::instance().
>
> Derive from WApplication, it works.
> For example, you derived MyApplication from WApplication. To convert pointer
> to WApplication to pointer to MyApplication, use boost polymorphic cast:
>
> #include "boost/cast.cpp"
>
> WApplication* app = WApplication::instance(); // to just wApp
> MyApplication* myapp = boost::polymorphic_downcast(app);
>
> boost::polymorphic_downcast uses C++ built-in operators static_cast or
> dynamic_cast. Which one of them is used, depends on build configuration.
> Release build uses static_cast, Debug build uses dynamic_cast and checks
> result is not 0.
>
> If you use boost::polymorphic_downcast many times, it makes sense for you to
> create a macro for it:
> #define DOWNCAST boost::polymorphic_downcast
>
> Summary: to get WApplication*, use wApp, to get WEnvironment, use
> wApp->environment(), to get pointer to your derived application class, use
> boost::polymorphic_downcast. wApp is 0 in static WResource.
>
>
> You seem to use global WResource (added with WServer::addResource()). In this
> case, wApp is 0, so you can not use WApplication.
> To translate with WString::tr, you can use WServer::setLocalizedStrings().
> For this, you need Wt::WMessageResourceBundle instance. In main(), create new
> WMessageResourceBundle, call use() to add your translated XML files, then
> pass it to WServer::setLocalizedStrings(). BTW, this solution does not
> respect user's locale, all strings are translated to server's locale. I
> created feature request for this http://redmine.webtoolkit.eu/issues/3381
>
> You can workaround this by creation several global WMessageResourceBundle
> instances (one per language) and selection one of them depending on client's
> language manually. Then you can use WMessageResourceBundle::resolveKey to
> translate. To get clients locale, get HTTP header "Accept-Language" using
> Request::headerValue(). (Request instance is passed to handleRequest().)
> Parsing it is a complicated task. For example, "en-US,en;q=0.8,ru;q=0.6"
> means Russian.
>
>
> -
> Best regards,
> Boris Nagaev
> On Wed, Jun 25, 2014 at 9:42 AM, Jeffrey Scott Flesher Gmail
> <jeffrey.scott.fles...@gmail.com> wrote:
>
> Thanks for the reply, do you mean something like this, but not this,
> this does not work:
>
> void BlogRSSFeed::handleRequest(const Wt::Http::Request &request,
> Wt::Http::Response &response)
> {
> const Wt::WEnvironment& env =
> Wt::WApplication::instance()->environment();
> Wt::WApplication *app = new Wt::WApplication(env);
> Wt::WApplication::UpdateLock lock(app);
> if (lock)
> {
> app->messageResourceBundle().use("./app_root/ww-home", false);
> }
> // you can see I need to make my blog feed Multilingual, this is
> why I am doing all this
> std::string url = Wt::WString::tr("rss-url").toUTF8();
> std::string title_ = Wt::WString::tr("rss-title").toUTF8();
> std::string description_ =
> Wt::WString::tr("rss-description").toUTF8();
> ...
> }
>
> It crashes at the 1st line,
> my guess is that it does not like Wt::WApplication::instance()
> Doesn't work
> Wt::WApplication.environment()
> and just to be honest, this is not very intuitive example,
> since WApplication requires and WEnvironment,
> and WEnvironment requires an WApplication,
> its like what came firs the Chicken or the Egg,
> I can't define just the WEnvironment,
> const Wt::WEnvironment& env = new Wt::WEnvironment();
> I have tried every combination I can think of.
>
> I have asked many time in many different scenarios how to create an
> WApplication object,
> from a class that is not derived from WApplication,
> because I have never been able to figure it out,
> and this is the main issue I am having and I can not find an answer
> in the forums,
> or any other post, nor could I find an example of anyone ever doing
> this,
> so it would really help if someone could tell me that one line of
> code that will make this work?
>
> I understand that this resource is stand alone,
> so deriving it from WApplication is not really an option,
> yet this effects your own website, since its the same code,
> and I notice you did not make the blog feed Multilingual,
> and now I must ask why,
> since I figure you may have run into the same problem,
> otherwise you would have done it yourself,
> and least that is my thinking,
> so my question is can this be done,
> and if so how?
>
> Thanks
>
>
> On Wed, 2014-06-25 at 02:07 +0400, Nagaev Boris wrote:
> > Hello! Take application lock (Wt::WApplication::UpdateLock)
> > from handleRequest() if you change WApplication (by changing
> > message resource bundle). Multiple requests may happend
> > simultaneously for a single resource. To get WEnvironment
> > from WApplication, use method environment(). See
> >
> http://www.webtoolkit.eu/wt/doc/reference/html/classWt_1_1WApplication.html
> >
> >
> > for full description of WApplication.
> >
> > To get translated strings, use WString::tr() method. It works even
> in
> > handleRequest().
> >
> >
> > -
> > Best regards,
> > Boris Nagaev
> >
> >
> > On Tue, Jun 24, 2014 at 7:01 AM, Jeffrey Scott Flesher Gmail
> > <jeffrey.scott.fles...@gmail.com> wrote:
> >
> > > In the Example BlogRSSFeed, I want to use
> > messageResourceBundle,
> > > so in > BlogRSSFeed::handleRequest
> > > Wt::WApplication *app = Wt::WApplication::instance();
> > > app->messageResourceBundle().use("appPath", false);
> > > I get a runtime error.
> > > Any ideas on how I can get this to function correctly?
> > > Also I don't know how to get an instance of WEnvironment
> > from any class not derived from WApplication, do you?
> > > If I did, I could write a class to return the tr strings.
> > > Thanks
> > > _______________________________________________ >
> > witty-interest mailing list >
> > witty-interest@lists.sourceforge.net >
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