Re: [Cppcms-users] what is the integer in url_dispatcher::asign for?

[Artyom B. <art...@ya...>]

The number represents regular expression subexpression.

Quoting reference doc from url_dispatcher:

if regular expression is "^/page/(\\d+)/(\\w+)$" , exp1=2, and the url 
is "/page/13/to_be_or_not", then handler would be called with 
"to_be_or_not" as its first parameter

So number represents a subexpression you want to capture and pass as a parameter to function.

For example

  dispatcher().assign("/foo/(\\w+)/(\\w+)",&myclass::bar,this,2,1)

  For url /foo/bar/baz would call :  bar("baz","bar")


 
Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.sf.net/
CppDB - C++ SQL Connectivity: http://cppcms.sf.net/sql/cppdb/


>________________________________
> From: Marcel Hellwig <ke...@co...>
>To: cpp...@li... 
>Sent: Wednesday, January 18, 2012 11:48 AM
>Subject: [Cppcms-users] what is the integer in url_dispatcher::asign for?
> 
>
>Hello everybody,
>
>I wonder about this method:
>http://art-blog.no-ip.info/cppcms_ref_v0_99/classcppcms_1_1url__dispatcher.html#a92c984612be4b29e9e45b58cbe676f77
>this is (I think) the standard url assign method everybody uses.
>In the tutorial of url mapping (
    http://cppcms.sourceforge.net/wikipp/en/page/cppcms_1x_tut_url_mapping
    ) it says: "In the fourth line we connect the regular expression /number/(\d+) to the member function number of this instance that receives std::string as parameter, and 1st captured subexpression is passed to it." (4: "dispatcher().assign("/number/(\\d+)", &hello::number, this, 1);"  )
>So i now think, what happens if you put instead of a 1 a 0 to
        the method, like in the "message_board" example:
>/message_board/apps/thread.cpp:174:   
        dispatcher().assign(".*",&reply::prepare,this,0);
>
>And also some times ago our chinese/japanese (?) friend
        csfreebird posted some code like this:
>
>    dispatcher().assign("/welcome" , &kaimei_web_site::welcome , this , 1); //first page  
>    dispatcher().assign("/register" , &kaimei_web_site::register_client , this , 2); //register a new account on this page
>....
>    //restful web method called by Javascript form client-side
>    dispatcher().assign("/send_email" , &kaimei_web_site::save_email , this , 7);
>    dispatcher().assign("/create_account?(.+)" , &kaimei_web_site::create_account , this , 8);
>
>I think this is wrong, isn't it?
>
>Hope of some clearness.
>
>Marcel Hellwig
>
>
>
> 
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