https://forums.autodesk.com/t5/maya-programming-forum/mlockmessage-setnodelockquerycallback-callback-runs-after-the/m-p/4019786#M17603 Yes I think that Callback is used for eg, you delete a node and a window will come up saying you have deleted a node. Sat, 05 Jul 2008 03:24:28 GMT Anonymous 2008-07-05T03:24:28Z https://forums.autodesk.com/t5/maya-programming-forum/mlockmessage-setnodelockquerycallback-callback-runs-after-the/m-p/4019785#M17602 Maybe I just didn't understand what these callbacks are for.<BR />I was expecting the registered callback would run before the actual execution of the event that triggered it, but it's running after.<BR />For instance, if I try to delete a node, the callback would be triggered and would allow or deny the deletion of the node.<BR />Well, it's a little more complicated that that but that's the overall idea.<BR />Isn't that what the callbacks are for?<BR />What I'm getting is the node gets deleted, then the callback run, and it run 4 times, evidenced by 4 sets of textual output.<BR /><BR />I tried setting the callbacks via Python plugins as well as via the Python script editor (using the same API).<BR />I haven't tried the C++ API yet.<BR /><BR />Thanks<BR />dado Fri, 04 Jul 2008 08:37:03 GMT https://forums.autodesk.com/t5/maya-programming-forum/mlockmessage-setnodelockquerycallback-callback-runs-after-the/m-p/4019785#M17602 Anonymous 2008-07-04T08:37:03Z https://forums.autodesk.com/t5/maya-programming-forum/mlockmessage-setnodelockquerycallback-callback-runs-after-the/m-p/4019786#M17603 Yes I think that Callback is used for eg, you delete a node and a window will come up saying you have deleted a node. Sat, 05 Jul 2008 03:24:28 GMT https://forums.autodesk.com/t5/maya-programming-forum/mlockmessage-setnodelockquerycallback-callback-runs-after-the/m-p/4019786#M17603 Anonymous 2008-07-05T03:24:28Z