making a web services query using gSoap with query arguments

I'm attempting to convert a soap query written for C# into a gSoap query in Visual C++.

The C# query adds an XML node's to the query call, in order to pass parameters to the query:

XmlNode queryOpts = xmlDoc.CreateNode(XmlNodeType.Element, "QueryOptions", "");
queryOpts.InnerXml = "<DateInUtc>TRUE</DateInUtc>";

Here's the C# query, passing various args (some args are specified as XmlNode objects)

XmlNode nodeListItems = listService.GetListItems("Announcements", null, query, viewFields, null, queryOpts, null);

The C++ / gSoap query allows me to pass a query and response object:

listService.__ns10__GetListItems(&announcementQuery, &announcementResponse)

The query object has various properties that can be set that relate to the arguments in the C# call:

announcementQuery.listName  
announcementQuery.query   
announcementQuery.queryOptions 
announcementQuery.viewFields

The first argument there is a string, no problem.

The query, queryOptions and viewFields are a bit confusing.

"query" is a class of type ns2_GetListItems_query, and it has the following functions & members:

soap_default()
soap_get()
soap_in()
soap_out()
soap_put()
soap_serialize()
soap_type()
__any
__mixed

for query, queryOptions and viewFields, I'd simply like to specify an xml formatted string, like the C# code does, but I'm not sure how this is done.

Can someone cast some experience on this?

thanks!

ansaurus