use Or condition for Finding with COM API

By Xiaodong Liang

Issue
I create two find conditions and add into find spec. So it means condition1 "AND" with condition2. How can I make condition1 "OR" with condition2? "(A or B)"

Solution
InwOpFindCondition has a property [StartGroup] that can be used to do this:

"Set to FALSE to start new group of conditions. Conditions within groups are ANDed together, groups are ORed together."

The sample code below is tested with the SDK sample in <Navisworks Manage 2013>apiCOMexamplesActiveXActiveXFindExample. It searches the objects whose entity handle is “16C17” or “377” within the sample model <Navisworks Manage 2013>apiCOMexamplesgatehouse.nwd.

using NavisworksIntegratedAPI10;

private void findOr()
    { 
        // Create the various components of the
        // search using object factories
        InwOpFind find = 
            m_state.ObjectFactory(nwEObjectType.eObjectType_nwOpFind) 
            as InwOpFind;
        InwOpFindSpec findSpec =
            m_state.ObjectFactory(nwEObjectType.eObjectType_nwOpFindSpec)
            as InwOpFindSpec;
        // create first find condition
        InwOpFindCondition findCondition1 = 
            m_state.ObjectFactory(nwEObjectType.eObjectType_nwOpFindCondition)
            as InwOpFindCondition;
        // create second find condition
        InwOpFindCondition findCondition2 =
        m_state.ObjectFactory(nwEObjectType.eObjectType_nwOpFindCondition)
        as InwOpFindCondition;
 
        //configure the first find condition
        findCondition1.StartGroup = false;
        findCondition1.Condition = nwEFindCondition.eFind_EQUAL;
        findCondition1.SetAttributeNames("", "Entity Handle");
        findCondition1.SetPropertyNames("", "Value");
        findCondition1.value = "16C17";
 
        //configure the second find condition
        findCondition2.StartGroup = false;
        findCondition2.Condition = nwEFindCondition.eFind_EQUAL;
        findCondition2.SetAttributeNames("", "Entity Handle");
        findCondition2.SetPropertyNames("", "Value");
        findCondition2.value = "377";
 
        //select all
        findSpec.selection = null;
        //add first find condition
        findSpec.Conditions().Add(findCondition1);
        //add second find condition
        findSpec.Conditions().Add(findCondition2);
        find.FindSpec = findSpec;
        bool bFirst=true;
        object match_data = Type.Missing;
        bool finished = false;
 
        // Populate the results table with the found items.
        do 
        {
        InwOaPath path =  
            find.Find(bFirst, ref match_data);
        bFirst = false;
        if (path != null)
        {
            InwOaNode node = 
                path.Nodes().Last() as NavisworksIntegratedAPI10.InwOaNode;
            // print some info of the node
            MessageBox.Show(node.ClassName + " "  +
                node.ClassUserName + " " + node.ObjectName);
        }
        else
            finished = true;
        }while(finished != true);
    }
}

If you are using pure .NET API, please refer to this blog:  Search by "OR"