gSOAP C++: nillable attributes

Question

how is it possible to set the xsi:nil="true" attribute on only single elements? With the runtime-flag "SOAP_XML_NIL" I will set it globally, so it affects every attribute.

Thank you

Answer 1

To add xsi:nil="true" automatically to the XML payload when a class/struct member is NULL, you will only need to annotate the member as required (with a 1):

class ns__some_data
{
   public:
     int *some_member 1; // nillable pointer & element is marked as required
};

When setting ns__some_data::some_member = NULL, the XML will have the xsi:nil attribute, which is what I think you want:

<ns:some-data>
  <some-member xsd:nil="true"/>
</ns:some-data>

To make sure this works as expected, you will need to upgrade to the latest version of gSOAP (2.8.28 or later).