Re: [Cppcms-users] CppCMS 1.x.x JSON object value empty/not exist

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

Yes you can.

Simplest way is to use get with default parameter. For example

json::value v;

v.get("foo.bar",10);

And if foo.bar is not defined or invalid you get 10 instead.

You can also use find member function and test the type:

if(v.find("foo.bar").type()==cppcms::json::is_number)
  ...
else
  ..

Take a look on documentation of: cppcms::json::value

  http://art-blog.no-ip.info/cppcms_ref_v0_99_1/classcppcms_1_1json_1_1value.html
or (mirror)
  http://cppcms.sourceforge.net/cppcms_ref_v0_99_1/classcppcms_1_1json_1_1value.html

Especially functions: find(), at(), get() they allow you to browse the object on different paths.

Regards,
Artyom




________________________________
From: Geert Van de Velde <gee...@ba...>
To: cpp...@li...
Sent: Tue, June 15, 2010 4:54:38 PM
Subject: [Cppcms-users] CppCMS 1.x.x JSON object value empty/not exist

Hi,

I'm trying to use cppcms for a new project and use it for building a
RESTLike API for a device. The API will communicate with the JSON data
format.

When receiving JSON data from a client some fields of an object are
optional. I'm using json::value for handling this.
I use the get<T> function to fetch the fields but in case of a missing
field or invalid field data it throws an exception. Is it possible to
detect that the field is missing separately? So I can ignore missing
optional fields.

Tnx


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