Re: Expanding Nodes in TreeControl, yields Error: "unsatisfied query for interface…

Michael Stahl mstahl at
Wed Jul 12 08:52:12 UTC 2017

On 12.07.2017 00:07, jan wrote:
> Am 11.07.2017 um 15:34 schrieb Michael Stahl:
>> On 09.07.2017 12:51, jan wrote:
>>> ERROR: However, when I call treeControl.expandNode(someNode), (someNode
>>> being a [3])I get the following error:
>>> unsatisfied query for interface of
>>> type! (Error during invoking function
>>> [… callstack…]
>>> I assumed, since the TreeControl has the method, the data model in the
>>> one that is set for the TreeControl and XMutableTreeNode inherits from
>>> XTreeNode, I should be able to do what I tried above.
>> i suspect you're calling this:
>> void SAL_CALL UnoTreeControl::expandNode( const Reference< XTreeNode >&
>> xNode )
>> {
>>     Reference< XTreeControl >( getPeer(), UNO_QUERY_THROW
>> )->expandNode(xNode);
>> }
>> getPeer() returns UnoControl::mxPeer and that is created on-demand by a
>> couple of other functions; i'm assuming it is null in your case?
> Good question – I can't tell. I am using the API from python (sorry, I
> think I forgot to say, so one could only guess from the code) and
> debugging python I don't get to see what happens "inside" the C++
> function. I might be able to understand the problem better, if I read
> the code snippet you posted though I hoped I could stay on the pyUNO
> level :-)

well you can just call treeControl.getPeer() and see if it's null...

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